Best way in a large system is a blower with a hopper over it. You only need a small amount of dust on the plants.
Another way is mix in water then spray it on, when dries you will see a small amount on each plant. You must keep it agitated or it will settle to bottom of sprayer tank.
Diatomaceous earth works because its like microscopic glass to the insects. Only works because insects have exoskeleton systems, has no effect on plants or mammals. It is very beneficial because the soil is depleted of all silica and silica is a very important nutrient. Your joints have to have silica to repair itself.
Gold standard: because man can not be trusted to control his greed
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