Diatomaceous Earth (DEE-E): FAQs
Yes, it can, as its effect is mechanical, and it will affect any insect it comes into contact with, including beneficial insects like bees or ladybugs. So to reduce this danger, apply Diatomaceous Earth when outside beneficial insects such as bees are least active (early morning or late evening). Target the problem areas instead of general application.
This depends a lot on the pest and environmental conditions. Generally, you will be able to see results some hours or days after the application. It takes time for dehydration to take place, but consistent application in dry conditions will get the fastest results.
Absolutely, Diatomaceous Earth is generally harmless to plants and can, in fact, work as a soil amendment by improving aeration and water retention. When applied to foliage, the disadvantage will keep away from common garden pests.