The best advice is to stay away from insecticides unless you see a problem. Pesticides that drip into our waterways cause fish kills and other environmental problems. I recommend that you use organic controls whenever you can.
Insects build up resistance to pesticides, creating superbugs .
Use the safest product possible and make sure you have the problem correctly identified so you will not use the wrong pesticide. Less usually is better than more. I have sprayed only twice on my property in the past 17 years for a localized problem. General Suggestions Spray in the early morning or late evening when the temperature is below 85 degrees. Spraying when temperatures are over 85 degrees can burn leaves and cause leaf yellowing or leaf drop.