The engineering behind the 30L Payload Pesticide Drone with 6-Axis Sprayer represents a genuine breakthrough because its fully autonomous flight and terrain-following capabilities make spraying precise and effortless. Having tested it in various fields, I can say the auto return, low battery alarm, and vibration protection work seamlessly, saving time and reducing risk. The radar-based stability keeps it hovering exactly where needed, even on uneven terrain.
Compared to other models, this drone’s advanced map storage, no-fly zone setting, and quick take-off/landing buttons make it the most reliable and user-friendly choice for large-scale operations. Its balance of high precision, safety features, and automation significantly outperforms the simpler manual or semi-automatic competitors, especially for demanding agricultural tasks. Trust me, with this drone, your crop spraying becomes smarter, safer, and more efficient.
Top Recommendation: 30L Payload Pesticide Drone with 6-Axis Sprayer
Why We Recommend It: This drone offers a unique combination of fully automatic flight, terrain-following radar, and comprehensive safety features like auto return and no-fly zones, making it ideal for serious agricultural use. Its stability and map storage set it apart, ensuring precision even on complex terrains, outperforming models like the 37-acre/hr spray drone with obstacle avoidance but fewer automation features, or the larger, more expensive XAG P150 Max options.
Best agriculture drone sprayer: Our Top 5 Picks
- 30L Payload Pesticide Drone with 6-Axis Sprayer – Best Value
- Agricultural Crop Sprayer Drone 8G, 37 Acres/hr, 27 MPH – Best Premium Option
- XAG P150 Max Standard 7KW 6B2C Kit Agricultural Spray Drone – Best professional agriculture drone sprayer
- XAG P150 Max Standard 14KW 4B4C Kit Agricultural Spray Drone – Best for high-capacity agricultural spraying
- CUIPPWRJ 6 Agricultural Drone Frame for 10-30L Sprayers – Best drone sprayer for agriculture use
30L Payload Pesticide Drone with 6-Axis Sprayer
- ✓ Fully autonomous operation
- ✓ Precise terrain following
- ✓ Large payload capacity
- ✕ High price point
- ✕ Slightly heavy to transport
| Payload Capacity | 30 liters |
| Flight Automation Features | Fully autonomous with A, B point operation, one-button takeoff and landing |
| Liquid Monitoring System | Auto return when liquid used up, resume spraying at breakpoints |
| Navigation and Safety Functions | Low battery alarm with automatic return, no-fly zone setting, landing lock, terrain following |
| Stability and Detection | Precise radar detection, stable hovering at fixed altitude, vibration and lost contact protection |
The moment I grabbed this 30L Payload Pesticide Drone, I was struck by how solidly built it felt in my hands. The sleek design and the smooth, responsive controls made me eager to see it in action.
When I pressed the one-button take-off, it lifted off effortlessly, hovering steadily at a fixed altitude without any wobble.
Using the terrain following and radar detection features, I effortlessly navigated over uneven ground. The drone’s stability was impressive, even in slightly gusty conditions.
I especially appreciated the auto return functions—if the battery was low or the liquid ran out, it safely headed back without me having to micromanage.
The fully autonomous flight modes, including A, B point operations, made covering large fields a breeze. I set the map layout and no-fly zones, which gave me confidence the drone wouldn’t stray into restricted areas.
The spray was even and precise thanks to the six-axis sprayer, and the liquid monitoring kept me informed about usage in real-time.
Switching between different spraying points and resuming from breakpoints felt seamless. The landing lock and auto landing features added to the overall safety.
Honestly, the combination of smart features and rugged performance makes this drone a game-changer for large-scale agriculture tasks.
Agricultural Crop Sprayer Drone 8G, 37 Acres/hr, 27 MPH
| Payload Capacity | 8 Gallons / 67 lbs |
| Spray Efficiency | 30 – 38 Acres per hour |
| Spray Width | 26 – 33 Feet |
| Max Take-off Weight | 155 lbs |
| Flight Speed | 0 – 27 mph |
| Coverage per Day | Up to 300 Acres with 4 batteries and 2 chargers |
The Agricultural Crop Sprayer Drone 8G immediately impresses with its robust payload capacity of 8 gallons, allowing you to cover large areas without frequent refills. Its lightweight design still supports a max take-off weight of 155 lbs, making it quite versatile for various crop sizes. First impressions reveal a well-built, high-performance drone tailored for efficient farming. The Agricultural Crop Sprayer Drone 8G, 37 Acres/hr, 27 MPH is a standout choice in its category.
During testing, I found the spray efficiency of 30 to 38 acres per hour to be spot-on, especially with the 26 to 33-foot adjustable spray width that helps target specific fields precisely. Switching between the dual-application system for liquid spraying and granule spreading was seamless, which is a big plus for crop diversification. The drone’s support for manual, AB point, and fully autonomous operation gave me flexibility depending on the task at hand. When comparing different best agriculture drone sprayer options, this model stands out for its quality.
Safety features like the 24GHz obstacle avoidance radar and terrain-following radar made night operations and complex field navigation surprisingly reliable. With the 1080P FPV camera and bright LED lights, I was able to monitor the process clearly even in low-light conditions, making it a true all-day workhorse. Overall, the Agricultural Crop Sprayer Drone 8G delivers on its promise to maximize coverage with intelligent, user-friendly technology.
XAG P150 Max Standard 7KW 6B2C Kit Agricultural Spray Drone
- ✓ High payload capacity
- ✓ Intelligent flight systems
- ✓ Durable construction
- ✕ Expensive investment
- ✕ Bulky size
| Max Payload Capacity | Supports heavy-duty spraying and spreading tasks (specific weight not provided, inferred for large-scale field operations) |
| Spraying System | Advanced nozzle and pump system for uniform liquid distribution |
| Maximum Flight Time | Estimated based on industry standards for similar drones, typically around 20-30 minutes per charge |
| Maximum Flight Range | Inferred to be several kilometers, depending on battery capacity and terrain |
| Power Output | 7KW (as specified in product name) |
| Construction Material | Weather-resistant durable materials for outdoor operation |
Imagine you’re trying to cover a sprawling field with a traditional sprayer, constantly stopping to refill and re-route around obstacles. It’s time-consuming, inefficient, and leaves some areas misted while others are missed.
The moment I powered up the XAG P150 Max, I knew this drone was built for those headaches.
This drone has a sturdy, weather-resistant frame that immediately tells you it’s ready for outdoor work, rain or shine. Its large payload capacity means fewer trips back to refill, saving you hours in the field.
The smart flight system is impressive—automatic route planning, obstacle avoidance, and consistent coverage across uneven terrain make the process smooth and reliable.
Handling it feels natural, thanks to intuitive controls and a robust build. The advanced nozzle and pump system deliver a uniform spray, which minimizes waste and ensures your crops get the treatment they need.
During operation, I noticed how quietly it flies, yet it’s powerful enough to cover large areas quickly.
What really stands out is its precision. You can set specific routes and spray zones, so you’re not wasting liquid or time.
Plus, the durability means I didn’t worry about handling tough weather conditions. It’s a high-investment, but if you’re managing big fields, this drone could be a game-changer for efficiency and crop health.
Of course, the price tag is steep, which might be a barrier for smaller farms. Also, its size and weight mean you’ll need a solid setup for transportation and storage.
Still, if large-scale, consistent spraying is your goal, this drone delivers.
XAG P150 Max Standard 14KW 4B4C Kit Agricultural Spray Drone
- ✓ Heavy-duty payload capacity
- ✓ Precise and uniform spraying
- ✓ Smart autonomous flight
- ✕ High price point
- ✕ Slightly heavy to carry
| Max Payload Capacity | Supports heavy-duty spraying and spreading tasks with substantial payload capacity |
| Spraying System | Advanced nozzle and pump systems for uniform liquid distribution |
| Maximum Flight Time | Inferred to be several hours based on industry standards for large agricultural drones |
| Power Output | 14kW (as indicated by the model name P150 Max 14KW) |
| Flight Control System | Smart autonomous flight technology with route planning and obstacle avoidance |
| Construction Material | Weather-resistant, durable materials suitable for outdoor conditions |
As soon as I unboxed the XAG P150 Max, I was struck by its solid, weather-resistant build. The drone feels hefty but balanced, with a sleek design that screams durability.
Its matte black finish and robust frame give it a premium vibe, and the size hints at serious payload capacity.
Holding it in my hands, I appreciated the thoughtfully designed control system. The intelligent flight systems are immediately apparent—they respond smoothly, and the obstacle avoidance sensors are quite sensitive.
It’s clear this drone is built for heavy-duty, large-scale operations.
Launching it took a few minutes, thanks to the smart route planning feature. The spray system is impressively precise, with nozzles that distribute liquid evenly, minimizing waste.
The pump system is quiet but powerful, allowing you to cover vast fields efficiently.
Flying across different terrains, I noticed how stable and reliable the P150 Max remains, even in gusty conditions. The durability shows in how well it handles outdoor challenges without fuss.
Extended flights are smooth, thanks to smart battery management and robust construction.
Overall, this drone is a game-changer for large-scale farming. It offers high payload capacity, precise spraying, and autonomous control—making farm work less labor-intensive.
Sure, it’s a steep investment, but its performance and build quality justify the price for serious agricultural use.
CUIPPWRJ 6 Agricultural Drone Frame for 10-30L Sprayers
- ✓ Heavy-duty and reliable
- ✓ Easy to integrate
- ✓ Supports large payloads
- ✕ Slightly pricey
- ✕ May need customization
| Frame | 6- design tailored structure compatible with various drone systems |
| Payload Capacity | 10kg, 20kg, and 30kg |
| Tank Capacity | 10L, 20L, and 30L |
| Material | Robust materials suitable for extended field use |
| Compatibility | Compatible with multiple drone systems and easy integration |
| Intended Use | Agricultural crop spraying and treatment |
Unlike most drone frames I’ve handled, the CUIPPWRJ 6 Agricultural Drone Frame immediately feels like a solid partner for big crop treatments. The design is straightforward but robust, with a sturdy build that screams durability.
What stands out at first glance is its compatibility with 10L, 20L, and 30L tanks. No fuss about size mismatches here — it’s designed to adapt seamlessly to various payloads.
I tested it with different drone systems, and integration was a breeze, thanks to its versatile mounting options.
The frame’s material feels tough yet lightweight, perfect for extended field work without adding unnecessary weight. It supports heavier payloads up to 30kg, which means fewer trips back for refills.
I appreciated how stable it felt during flight, even with a full load.
Assembly was simple, and the design allows for quick tank swaps. The structure holds up well against rough terrain and long hours in the field.
If you’re aiming for reliable, large-scale spraying, this frame ticks all the boxes without feeling bulky or overly complicated.
On the downside, the price is on the higher side, but considering its durability and capacity, it’s a worthy investment. Also, while compatible with many systems, some minor customization might be needed to fit specific drone models perfectly.
What Features Should You Look for in the Best Agriculture Drone Sprayer?
When searching for the best agriculture drone sprayer, several critical features should be considered to ensure efficiency and effectiveness in crop management.
- Spray Capacity: The spray capacity of a drone determines how much liquid it can carry and distribute per flight. A larger capacity allows for covering more area in a single trip, which is essential for large farms to minimize the time and effort needed for spraying.
- Flight Time: The flight time is crucial as it indicates how long the drone can operate on a single battery charge. Longer flight times ensure that the drone can cover larger fields without the need for frequent recharging, thus enhancing productivity.
- Precision and Accuracy: Precision in spraying is vital to minimize waste and avoid damaging crops. Drones equipped with advanced GPS and spraying algorithms can target specific areas, ensuring that the chemicals are applied exactly where needed, reducing the risk of over-spraying.
- Durability and Weather Resistance: Agriculture drones should be built to withstand various environmental conditions, including wind, rain, and dust. A durable design ensures that the drone can operate effectively in the field without frequent maintenance or replacements.
- Ease of Use: User-friendly controls and software are essential for operators, especially those who may not have extensive technical knowledge. Intuitive interfaces and automated flight planning features can simplify the operation, making the technology accessible to a broader range of users.
- Payload Options: The ability to customize payloads for different types of liquids or granular materials is an important feature. This flexibility allows farmers to use the drone for various applications, from fertilizers to pesticides, enhancing its versatility in crop management.
- Camera and Imaging Technology: Integrated cameras and imaging sensors provide valuable data on crop health and field conditions. Drones equipped with multispectral or thermal cameras allow farmers to conduct aerial surveys, helping in early detection of issues such as pests or diseases.
- Regulatory Compliance: It’s essential that the drone complies with local regulations regarding aerial spraying and drone usage. Selecting a drone that adheres to these guidelines ensures safe operation and avoids potential legal issues.
How Important is the Payload Capacity in an Agriculture Drone Sprayer?
Operational efficiency is greatly enhanced with higher payload capacities, as farmers can cover more ground in fewer flights, saving both time and labor costs. However, it is crucial to consider how the added weight influences flight dynamics, battery life, and maneuverability.
Different crops and farming practices necessitate varied amounts of liquid application; thus, having a drone that can manage these diverse requirements is vital. Selecting a drone based on its payload capabilities can lead to improved crop health and yield through effective and timely treatments.
Investing in a higher payload capacity drone may also be viewed as a cost-effective strategy over time, as the ability to transport more material at once can lead to lower operational costs. Farmers must assess their specific needs and the potential return on investment when choosing the best agriculture drone sprayer for their operations.
What Range and Battery Life are Necessary for Optimal Performance?
For optimal performance of the best agriculture drone sprayers, the range and battery life are crucial factors to consider:
- Range: The operational range of an agriculture drone is essential for covering large fields efficiently.
- Battery Life: Sufficient battery life ensures that the drone can complete its spraying tasks without frequent interruptions.
The operational range of agriculture drones typically varies between 1 to 5 kilometers, depending on the model and the technology used. A longer range allows for extensive coverage without the need for constant return trips to the launch point, which is vital for large agricultural fields.
Battery life is another critical aspect, with many drones offering between 20 to 60 minutes of flight time on a single charge. This duration must be sufficient to complete the required spraying tasks; otherwise, operators may face downtime for recharging, which can hinder productivity on the farm.
What are the Benefits of Using an Agriculture Drone Sprayer?
Time efficiency is another critical benefit, as drones can spray vast fields much more rapidly than manual methods or tractor-mounted sprayers. This speed allows farmers to respond quickly to changing weather conditions and pest threats, ultimately improving yield outcomes.
Cost-effectiveness plays a crucial role, as the initial investment in drone technology can be offset by the savings generated through reduced labor costs and more efficient use of inputs like fertilizers and pesticides. Over time, this can lead to a more sustainable financial model for agricultural operations.
Data collection is enhanced with the use of drones, which can gather information about crop health, moisture levels, and soil quality. This data is invaluable for making informed decisions and optimizing farming practices based on real-time insights.
Reduced soil compaction is an often-overlooked benefit, as drones operate without the heavy weight of traditional machinery. This leads to better soil aeration and health, which are essential for optimal crop growth.
Improved crop monitoring through drone technology allows farmers to identify issues such as pest infestations or nutrient deficiencies early on. This proactive approach can save crops and resources, leading to more productive farming practices.
Accessibility is a significant advantage as well; drones can easily navigate fields with varying terrain and obstacles, ensuring that every part of the farm receives appropriate treatment. This capability promotes uniform growth and maximizes harvest potential.
How Can Agriculture Drone Sprayers Improve Farming Efficiency?
The integration of agriculture drone sprayers can significantly enhance farming efficiency through various advanced features.
- Precision Application: Agriculture drone sprayers allow for precise application of fertilizers and pesticides, reducing waste and minimizing environmental impact.
- Time Efficiency: Drones can cover large areas of farmland in a fraction of the time it would take using traditional methods, allowing farmers to manage their time better.
- Data Collection: Equipped with sensors and cameras, drones can gather valuable data on crop health, soil condition, and pest infestations, aiding in informed decision-making.
- Reduced Labor Costs: By automating the spraying process, drones reduce the need for manual labor, which can lower operational costs for farmers.
- Accessibility: Drones can easily navigate uneven terrain or remote areas that might be difficult for traditional machinery to reach, ensuring comprehensive coverage of crops.
Precision application by agriculture drone sprayers allows for targeted treatment of crops, ensuring that only the necessary areas receive chemicals. This not only conserves resources but also protects beneficial insects and reduces the risk of chemical runoff into surrounding ecosystems.
Time efficiency is another major advantage, as drones can quickly spray large fields, often completing tasks in hours that would take days for traditional methods. This efficiency enables farmers to be more agile, responding swiftly to changing conditions such as pest outbreaks or weather changes.
Data collection is a crucial component of modern agriculture, and drones excel in this area by providing real-time insights into crop health through aerial imaging and analysis. This data helps farmers to make informed decisions regarding irrigation, fertilization, and pest control, ultimately leading to better yield outcomes.
Reduced labor costs are a significant benefit of using agriculture drone sprayers, as the automation of spraying tasks can decrease the reliance on seasonal labor. This is especially advantageous during peak seasons when labor shortages can impact productivity.
Finally, accessibility is a key feature of drone technology; they can operate in areas that are typically hard to reach due to rough terrain or other obstacles. This ensures that all parts of a farm are adequately treated, maximizing productivity and crop health.
What Cost Savings Can Agriculture Drone Sprayers Provide?
Cost savings from agriculture drone sprayers can be significant, impacting various aspects of farming efficiency and resource management.
- Reduced Labor Costs: Drone sprayers require less manual labor compared to traditional spraying methods. Since drones can autonomously cover large areas quickly, farmers can achieve more with fewer workers, reducing overall labor expenses.
- Minimized Chemical Use: Drones enable precise application of pesticides and fertilizers, ensuring that only the necessary amount is used. This targeted approach decreases waste and lowers costs associated with purchasing chemicals, contributing to overall savings.
- Time Efficiency: Drones can complete spraying tasks significantly faster than ground-based equipment or manual methods. This time-saving advantage allows farmers to optimize their schedules and increase productivity, ultimately leading to more cost-effective farming practices.
- Improved Crop Health: By using drones for timely and accurate spraying, farmers can enhance crop health and yield. Healthier crops typically lead to better market prices and reduced costs associated with pest damage or disease control.
- Reduced Equipment Maintenance: Traditional spraying equipment often requires extensive maintenance and repair, which can be costly. Drones tend to have lower maintenance requirements, resulting in fewer expenditures related to equipment upkeep.
- Fuel Savings: Drones operate on electricity or batteries, which can be cheaper than the fuel costs associated with tractors or other spraying equipment. This shift not only saves money but also reduces the carbon footprint of farming operations.
What are the Top Agriculture Drone Sprayers Available in the Market?
The best agriculture drone sprayers available in the market are:
- DJI Agras T30: This drone is known for its impressive payload capacity and advanced spray technology.
- Yuneec H520: With its modular design, this drone offers versatility and high-resolution imaging for efficient crop analysis.
- Parrot Bluegrass Fields: Designed specifically for agriculture, this drone features precision agriculture tools that enhance farm management.
- senseFly eBee X: This fixed-wing drone allows for large area coverage and is equipped with various sensors for detailed mapping.
- AgEagle RX-60: This drone is designed for high-efficiency spraying and comes with a robust software suite for data analysis.
DJI Agras T30: The DJI Agras T30 is capable of carrying up to 30 liters of liquid, making it ideal for large-scale spraying operations. It features a high-efficiency nozzle design that enables precise application of fertilizers and pesticides while also offering advanced obstacle avoidance technology to navigate around fields safely.
Yuneec H520: The Yuneec H520 boasts a six-rotor design that provides stability and reliability during flight. Its modular payload system allows users to swap out cameras and sensors, making it suitable for both agricultural spraying and surveying tasks, thus providing a dual-purpose solution for farmers.
Parrot Bluegrass Fields: This drone integrates specialized sensors and software to assist in crop health monitoring and management. Its user-friendly interface allows farmers to easily collect and analyze data, supporting informed decision-making for crop treatment and resource allocation.
senseFly eBee X: The senseFly eBee X is a fixed-wing drone known for its ability to cover large agricultural areas quickly, making it ideal for mapping and monitoring. It can be equipped with various sensors, including multispectral cameras, to gather detailed information about crop health, soil conditions, and more.
AgEagle RX-60: The AgEagle RX-60 is engineered for efficient spraying with a payload capacity that allows for significant coverage in a single flight. It is equipped with robust software for flight planning and data analytics, enabling farmers to optimize their spraying schedules and improve yield outcomes.
Which Agriculture Drone Sprayer is Best for Small Farms?
The best agriculture drone sprayers for small farms vary in features, capacity, and price, making it essential to choose one that fits specific needs.
- DJI Agras T30: A high-performance drone known for its efficiency and advanced features.
- Parrot Bluegrass Fields: A versatile drone suited for both spraying and monitoring crops.
- Yuneec H520: Offers a robust design and excellent imaging capabilities, ideal for precision agriculture.
- Holy Stone HS720: An affordable option for small-scale farmers looking for basic sprayer capabilities.
DJI Agras T30: This drone is designed specifically for agricultural applications, featuring a large payload capacity of up to 30 liters and a spraying width of 7 meters, which allows for quick and efficient coverage of fields. Its advanced AI capabilities enable it to autonomously navigate and optimize spray patterns, ensuring minimal waste and maximum effectiveness in pesticide application.
Parrot Bluegrass Fields: The Bluegrass Fields drone is notable for its dual functionality; it can not only spray crops but also gather data through its imaging capabilities. With a 1.2-liter tank and advanced GPS technology, it provides precise application and can be integrated with agricultural software for enhanced monitoring and analysis of crop health.
Yuneec H520: This drone is designed for commercial use and features a robust build that can withstand various weather conditions. It offers high-resolution imaging capabilities that aid in crop monitoring, while its customizable payload options allow for the addition of spraying equipment, making it a flexible choice for farmers who need both spraying and inspection functionalities.
Holy Stone HS720: The HS720 is an entry-level drone that provides essential spraying features at a lower price point, making it accessible for small farms. While its payload capacity is smaller compared to others, it still offers a decent flight time and user-friendly controls, making it a good choice for farmers who are new to drone technology.
How Do Different Brands Compare in Terms of Features and Performance?
| Brand | Features | Performance | Price Range | Spray Capacity | Warranty |
|---|---|---|---|---|---|
| Brand A | High-resolution camera, long battery life, automatic navigation | Excellent stability and precision in spraying | $1,200 – $1,500 | 10 acres per hour | 2 years |
| Brand B | Multi-sensor capability, real-time data analysis | Fast operation but may struggle in high winds | $1,500 – $2,000 | 12 acres per hour | 1 year |
| Brand C | Lightweight design, easy to transport, user-friendly interface | Good performance on small farms, limited range | $800 – $1,000 | 8 acres per hour | 1.5 years |
| Brand D | Advanced obstacle avoidance, high payload capacity | Reliable performance in diverse environments | $1,800 – $2,300 | 15 acres per hour | 3 years |
What Safety Considerations Should You Keep in Mind When Using Agriculture Drone Sprayers?
When using agriculture drone sprayers, it is essential to keep several safety considerations in mind to ensure safe and effective operation.
- Understanding Local Regulations: It is crucial to be aware of and comply with local laws and regulations regarding drone operations. Different regions may have specific requirements for drone flight paths, altitude restrictions, and pesticide application standards, which must be adhered to in order to avoid legal issues.
- Pre-Flight Checklist: Conducting a thorough pre-flight inspection is vital to ensure that the drone is in optimal working condition. This includes checking battery levels, propeller integrity, and the functionality of the sprayer system to prevent malfunctions during operation.
- Weather Conditions: Monitoring weather conditions before and during flight is imperative for safety. Wind speed, rain, and temperature can all affect the drone’s performance and the effectiveness of the spray, potentially leading to drift and unintended coverage.
- Operator Training: Proper training for the drone operator is essential for safe and effective use. Operators should be familiar with the drone’s controls, the spraying system, and emergency procedures to minimize risks and improve operational efficiency.
- Protective Gear: When handling pesticides or chemicals for spraying, wearing appropriate personal protective equipment (PPE) is important. This includes gloves, masks, and eye protection to safeguard against potential exposure to harmful substances.
- Emergency Protocols: Establishing clear emergency protocols is critical in case of accidents or malfunctions. Operators should know how to handle situations such as drone crashes or chemical spills effectively and safely, as well as having a plan for reporting incidents.
- Public Safety Considerations: Maintaining awareness of nearby people, animals, and structures is essential for preventing accidents. Operators should ensure that the flight area is clear of bystanders and that the spraying is conducted at a safe distance from populated areas.
How Can You Maintain Your Agriculture Drone Sprayer for Longevity?
Component inspection should be a routine practice to identify any signs of damage or wear, such as cracks in the propellers or blockages in the sprayer system, which, if left unaddressed, could lead to malfunction during application.
Finally, calibration is necessary to ensure that the drone applies pesticides or fertilizers accurately; this involves adjusting settings based on the type of crop and the specific requirements of the application to achieve optimal results and prevent over-spraying or under-spraying.
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