VA Pesticide Exam with Questions and Answers

VA Pesticide Exam with Questions and Answers Dusts (D) ANSWER Most ready to use and contain a low percentage of active ingredients. Some are high concentrations and must be mixed with dry carriers before application. One or more active ingredient plus very fine dry inert carrier such as chalk clay or ash. Do not mix with liquid solvent as they are not soluble and always used dry. Pros- Usually ready to use Good option where liquid from spray can cause damage Simple application equipment Effective in hard to reach outdoor areas Con Easily drift Residues do not adhere to surfaces treated Irritation risk high Dampness can clog equipment Granules (G) ANSWER Similar to dust but larger and heavier. Not water soluble. Ready to use. Coarse particles serve as carriers which as adsorptive substances like clay. Active ingredient either coats outside of granules or is absorbed into them. Active ingredient low. Once applied granules slowly release active ingredient, some require soil or moisture to release ingredient. Mostly used to apply chemicals to the soil. Pros Ready to use Low drift hazard and applicator hazard Simple equipment Breakdown slower than WPs or EC