Michigan State University’s John Wise uses a rain chamber to measure the rainfastness of insecticides sprayed on apple trees in the field, with the fruit and leaf clusters brought into the chamber and exposed to simulated rain. Though insecticide labels provide plenty of dos and don’ts, growers are often left in the dark when it comes to the chemical’s rainfastness and when reapplication may be needed if rain occurs after treatment. A Michigan State University entomologist is working to develop a rainfastness database that will guide growers in deciding when retreatment for codling moth and other insect control may be […]