Whether you apply insecticides and fungicides as sprays, dust, mists, or aerosols, all parts of the plant must be covered for effective control.
Fine Cone-Shaped Spray
A fine cone-shaped spray under constant pressure is best, and a tong spray gun with an adjustable nozzle that can be turned up enables you to wet the undersides of even the lowest leaves.
Move the spray nozzle quickly up and down in overlapping strokes around the entire plant. Both the upper and lower surface of the leaves should be wet to the point of dripping.
Dusters with a flange nozzle help produce a fine cloud that settles rapidly, leaving a thin film of dust on the leaves.
Clouds should be blown underneath as well as on top of the leaves.
Best Coverage For Plants
The best coverage is obtained if the plants are wet or damp and the air is calm—usually in the early morning or evening after the dew has formed.
While dust is easier to dust than a spray, dust must be used more frequently to obtain equal control.
With mists and aerosols, it is not necessary to wet leaves to the point of dripping, as it is with sprays, but they must be applied on windless days to ensure very thorough plant coverage.
Granular Insecticides And Fungicides
Granular insecticides and fungicides to control soil insects, diseases, and nematodes are generally sprinkled on lawns and gardens with a fertilizer spreader and then watered in.
It is important to get an even distribution, and the best way is to apply half the amount in one direction and the other half at right angles to it.
Recommended amounts of biological controls, such as milky disease spores for controlling Japanese beetles in lawns, are usually spotted at 3-foot intervals over the area.
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