Pest and beneficial insects on cotton genotypes with different morphologic characteristics, in center and southern Cesar (Colombia)

Abstract

It was evaluated the presence and damage of pest and beneficial insects on twelve cotton genotypes with different morphologies characteristics.  An investigation was conducted at Codazzi and Aguachica (Cesar) during 1996/97 and 1997/98.  In Codazzi Anthonomus grandis (Coleoptera: Curculionidae) was the key pest, the genotypes Linea 356, Tx Ormar 8-8176, 407-TL-619-2 and Zy Ocra, with characteristics frego bract, okra leaf and high Gossypol content showed the minor damage for attack of weevil.  Also emergence percentage and development period of the pest was evaluated.  The genotypes Tx Ormar 8-8176, Zy Ocra and ISA 205H, with characteristics pubescence and middle degree of pubescence leaves showed the minor presence of Alabama argillaceae (Lepidoptera:  Noctuidae).  The beneficial insects Cicloneda sanguinea and Coleomegilla maculate were present on all genotypes.