Types of sprays | Agristudent.com

Types of sprays agristudent.com

Pesticides application Techniques – Types of Sprays

Types of sprays agristudent.com

The pesticide application plays important role in pest management

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Organic Farming: Plant Origin Insecticides | Agristudent.com

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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

Coarse spray

400 µ – 500 µ droplet size

Medium spray

250 µ – 400 µ droplet size

Fine spray

100 µ – 250 µ droplet size

Mist

50 µ –100 µ droplet size

Fog

5 µ – 50 µ droplet size

Aerosol

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

Advantages

1. Meant for chewing insects.

2. Drift is very less

Disadvantages

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-
125 lit/ha.

The droplet size is 70 – 150 µ.

Advantages

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

Disadvantages

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.

Advantages

1. Very less time is required

2. No water requirement

3. Labour cost is less

4. Larger area covered (8 hac/day).

Disadvantages

1. Drift is more

2. More hazardous

3. Special foundations are needed

4. High cost

Aerial spraying

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.

Advantages

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.

Disadvantages

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

http://www.wikipedia.com

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 

 

 

Author: agristudent

Team Agristudent is a young and dynamic team of Agriculture specialists who have acquired specialised knowledge in their respective subjects. Their mission is to create a unique online encyclopedia of agriculture, which can be useful to millions around the world as an online reference library

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