Cotton bollworm attacks cotton, corn, potatoes, tobacco, vegetables.
Scientific name: Helicoverpa armigera
Greek name: Πράσινο Σκουλήκι
The young larvae feed on the leaves and then on the bracts, which fall off. The damage is most severe on the boll.
On the outside of the affected boll, the entrance hole and the larval excrement can be seen.
The inside of the bolls is eaten away by the cotton bollworms. Depending on their stage of development, the affected bolls fall off (the small ones) or rot on the plant, usually due to secondary fungal infections. A single larva usually attacks more than one boll.
The adult cotton bollworm (butterfly) has a wingspan of 35-45 mm and is yellowish in color with pinkish highlights. The forewings have a brown band at the tip and a brown spot towards the middle.
The larva of cotton bollworm reaches a length of about 40 mm and varies in color from light brown to green. Laterally it bears a light-colored line and a series of spots.