Cotton bollworm

The cotton bollworm (Helicoverpa armigera) is a devastating agricultural pest belonging to the order Lepidoptera, family Noctuidae. It is recognized globally as one of the most significant polyphagous pests due to its high reproductive potential, migratory capability, and development of resistance to many insecticides.

This pest affects a wide range of important agricultural plants. Key crops frequently damaged include sunflower, fodder beet, winter rapeseed, cabbage, hemp, winter barley, alfalfa, and apple trees. The ability to switch between different host plants allows this species to maintain high population levels throughout the growing season.

The life cycle consists of egg, larva, pupa, and adult stages. Females lay eggs individually on the plant surface. Upon hatching, larvae progress through several instars. The pupal stage typically takes place within the soil, providing the insect with protection against environmental stressors during overwintering periods.

Damage is characterized by intense feeding on both vegetative and reproductive parts. Younger larvae feed on leaves, while mature larvae bore into buds, flowers, and developing fruits. This feeding habit causes direct yield loss and introduces pathogens that lead to fruit decay and further secondary infections.

Control strategies must be integrated to be effective. Essential practices include deep plowing to expose pupae to natural enemies and cold weather, effective weed management, and the use of pheromone traps for monitoring. Chemical control should target early instar larvae using selective insecticides, ensuring timely application before the larvae bore deep into the plant tissue.