Biological control can also be used, he explains. It is sold in some nurseries and garden centers. The grasshopper consumes the product, the spores germinate in the grasshopper and they become sick and die. When applied properly, up to 70 percent of the grasshoppers are infected. Whether using biological controls or insecticides, all products work best when applied while the grasshoppers are young, he emphasizes.
Older grasshoppers are less affected.