Dusts:

• Insecticides mixed with dust carriers are called dusts.
• The particle size of dust ranges between 1 and 40 in general, the toxicity of an insecticide increases as the particle size decrease.
• The finishes product may contain 0.1-25% toxicant and the rest other carriers.
• Example of carrier are organic flour (wood bark, walnut shell flour), pulverized talc, gypsum, kaolins, volcanic ash. ‘D’ signifies the nature of formulation.

Advantage

• It is ready for use and can be applied on plant directly
• Any water scarcity problem is overcome

Disadvantage

• Dust drift problem
• Poor deposit on the target plants may result
• There is greater risk of contaminating animals and humans
• It is least effective and uneconomical