ABSTRACT
The objective of this study was to evaluate the non-preference of cotton bollweevil (Anthonomus grandis Boh., 1843) feeding and egg laying for ten upland cotton genotypes, Gossypium hirsutum L. Cotton genotypes ( IAN 338, IAN 93-64, CHACO 520, CACIQUE, OC 95-621, CD 401, OC 94-146, IAC 96-280, CNPA 7H, and CCA 331) were chosen based on recommendation by the VII Reunión de Coordenación de la Investigación Algodonera en el Cono Sul, Paysandú-Uruguai. Evaluations were made on squares and bolls attacked to the plants at 64, 85, and 122 days after emergence and we did evaluations on squares and cotton bolls present on the ground at 81, 98, 105, 112, 116, 125 and 144 days after emergence. After statistical analysis (Duncan, α = 0.05), significative differences were detected for total number of bolls showing feeding lesions and egg laying puncture and total number of squares (TMAC) and egg laying with feeding lesions/punctures among the evaluated fallen materials (TBAC), showing smaller attack grades CD 401for TMAC and TBAC, with no detected differences CCA 331, IAC 96-280, CHACO 520 and CNPA 7h. Considering that CD 401 had a shorter cycle compared to the other genotypes, it is possible that there was a phenological asynchrony or host escape.
KEY WORDS:
Plant resistance; Anthonomus grandis; IPM.