Will the cold temperatures increase grasshopper egg mortality? The answer for 2021 is probably not. In Canada, few grasshoppers hatched following a winter with temperatures at negative 22 degrees Fahrenheit (Riegert, 1967). However, Canada had little snow cover during the time period when mortality occurred. Snow cover generally reduces the impact of cold temperatures on below-ground overwintering insects.
How long does a seed treatment like Gaucho remain effective on grasshoppers? Insecticide seed treatment usually last about 21 days and will work for young grasshopper nymphs if they move int...
