When should I use chemical pesticides and fungicides?
Usually, it is not necessary to use chemical pesticides and fungicides in a home garden; and using toxic chemicals will likely do more harm than good. Instead, consider using non-chemical solutions such as interplanting insectory and companion plants in your garden, maintaining healthy soil fertility, and using organic sprays or diatomaceous earth dustings.
If you cannot curb a serious pest infestation, look to pesticides and fungicides as a last resort. Use the least toxic substance you can find that is made to target your specific pest problem, rather than more general “kills everything” pesticides, which are usually more toxic.
Before using any chemical product, consult the Integrated Pest Management (IPM) guidelines, and your local agricultural extension service agent for advice. Always follow instructions printed on labels for proper storage, safety and disposal when using any potentially toxic product.