The whitefly life cycle begins as yellow-orange, minute cigar-shaped eggs laid on end in groups or clusters usually on the undersides of leaves near the terminal. These eggs are sometimes laid in a circular pattern. The first instar nymph that emerges from the egg is termed a crawler. This is the only mobile stage of the immature whitefly, and the nymph will crawl short distances to find a suitable place to feed. Afterwards, the whitefly will undergo 3 molts at the same location. The non-mobile instars (immature nymphs) are oval and flattened in appearance and yellowish to translucent in color. The fourth instar nymph is termed a pupa.
Management of whitefly in cotton actually starts with winter and spring vegetables and planting of the cotton. Winter and spring vegetables provide the largest source of whitefly populations infesting cotton. Management of the pest on these crops and separation of cotton from these source populations play key roles in reducing potential problems in cotton. Timely destruction of vegetable crop residue that harbors active whitefly populations is one of the simplest methods of lowering potential levels of whiteflies infestations in nearby cotton fields. Chemical control: Imidacloprid 200 SC, Imidacloprid 70 WG, Force Plus.
Imidacloprid 200 SC (Imidacloprid 20%) - Classified green
Imidacloprid 70 WG (Imidacloprid 70%) - Classified red
Force Plus (Acetamiprid 100 gr/lt + Abamectin 20 gr/lt) - Classified green