Susceptibility of Gossypium hirsutum L. r. latifolium Hutch cultivars to Aphis gossypii Glover

Abstract

The Aphis gossypii Glover 1877, cotton aphid, can provoke significant losses in the productivity of susceptible cotton cultivars. However, the development of colonies of this insect can be reduced or interrupted in resistant cotton. This work has the objective of evaluating the A. gossypii behaviour in ten cultivars of Gossypium hirsutum L. in greenhouse. Plants of the cultivars: BRS Antares, CNPA 8H, BRS Sucupira, BRS ITA 96, BRS 201, BRS Facual, BRS Ipê, CNPA ITA 90, CNPA Precoce 3 and DeltaOpal were infested with five adult aphids after sixteen days of the germination. The counting of the number of adult/plant was made after 24 hours of infestation and of the number of nymphs and of adult/plant after six days of infestation. There was not statistical difference among the cultivars, which showed 4.1 adults after 24 hours of infestation, 7.8 and 62.9 nymphs and adults after six days of infestation, respectively.