Beet armyworm
substantial population of caterpillars, the damage can spread to the stems, and in the worst cases to the fruit. This often leads to the entire contents being [...] move to the ground in preparation for pupation. Although pupation sometimes occurs in the crop, it usually takes place on the surface of the ground in a [...] a regular problem for horticulturalists due to its resistance to nearly all insecticides, and its ability to develop on wild vegetation during the summer