The sunflower beetle, Zygogramma exclamationis (F.), has one generation per year in Manitoba. The beetle overwinters as a sexually immature adult in soil, usually at a depth of 15 cm or less, in fields in which it ...

The control of weeds is one of the oldest and still one of the most important problems connected with agriculture. Because we have always had weeds with us, there is a tendency to accept the situation as inevitable and one ...