Pesticides application Techniques – Types of Sprays
The pesticide application plays important role in pest management
You may also like to read –
What are the main purposes of pesticide application technique?
1. Cover the target species
2. safety to the non target organisms and the environment
What is essential for correct time of spraying pesticide?
The complete knowledge of pest is essential for correct time of application..!
Most of the pesticides are applied as sprays and therefore its effectiveness depends on the types of sprays
Classification of spraying
On the basis of the droplet size of the spray
Very Coarse spray –
> 500 µ droplet size
400 µ – 500 µ droplet size
250 µ – 400 µ droplet size
100 µ – 250 µ droplet size
50 µ –100 µ droplet size
5 µ – 50 µ droplet size
0.1 µ – 5 µ droplet size
On the basis of Volume of spray fluid per unit area
High volume spraying (HVS)
It is also called as Full Cover spraying or conventional spraying
Pesticide is diluted with water and droplet size is larger
Spray fluid requirement is
Field crops is 500 – 1000 lit/ha
Orchard crops – 1500 – 2000 lit/ha
1. Meant for chewing insects.
2. Drift is very less
1. Less area is covered
2. More water is required
3. More time , labour and cost of application due to labour cost
Low volume spray (LVS)
The low volume sprays are 8-25 times more concentrated than high volume spraying
Spray fluid requirement ranges from 12-
The droplet size is 70 – 150 µ.
1. Less time and less cost are involved in transport of water and hence the cost of application is minimized
2. More area is covered (6 – 8 acres in a day)
3. Control of pests is in time
1. Loss of chemical due to the drift
2. Application of LVS is preferred when wind velocity is less than 8 km/hour.
Ultra low volume spray (ULVS)
ULV sprayer or air craft with special nozzles require 0.5 – 5.6 lit/hac with droplet size of 20 – 70 µ.
1. Very less time is required
2. No water requirement
3. Labour cost is less
4. Larger area covered (8 hac/day).
1. Drift is more
2. More hazardous
3. Special foundations are needed
4. High cost
Aerial Air crafts has been employed for application of agricultural and public health pesticides
It is used for spraying, dusting and application of baits
However, Spray formulations are more suitable than dusts because of wind speed should not be more than > 5 KMPH
It has to be done at low heights and in the early hours of the days to ensure uniform deposition of dust particles.
1. Large area covered
2. Locusts, cut worms, army worms could be checked before much damage is done.
3. Cost of application is cheap per unit area.
4. Inaccessible areas are also can be protected.
1. Drift is more
2. Undersurface of leaves is not fully covered
3. Depend on weather conditions
4. Preplanning and collaboration with other agencies is required
5. Pollution is more
Further readings and references on types of sprays
Trapp, S.; Croteau, R. (2001). “Defensive Biosynthesis of Resin in Conifers”. Annual Review of Plant Physiology and Plant Molecular Biology
Murray B. Isman “Botanical Insecticides, Deterrents, And Repellents In Modern Agriculture And An Increasingly Regulated World” Annual Review Of Entomology