Abstract

HOLGUIN A, CLAUDIA MARÍA; CARABALI, ARTURO  and  BELLOTTI, ANTHONY C. Intrinsic rate of population increase of Aleurotrachelus socialis Bondar (Hemiptera:Aleyrodidae) in cassava Manihot esculenta. Rev. Colomb. Entomol. [online]. 2006, vol.32, n.2, pp.140-144. ISSN 0120-0488.

The whitefly Aleurotrachelus socialis (Hemiptera: Aleyrodidae) is one of the most important pests in the cassava crop (Manihot esculenta ) in the Neotropics. In Colombia, this is the main limiting problem that attacks cassava in the departments of Cauca, Valle del Cauca and Tolima, causing yield losses of up 79% in field experiments. In 1995, this species has colonized and increased its populations in new cassava varieties and areas where it was a secondary pest before. To estimate the potential of A. socialis to develop populations in new cassava varieties, the biological parameters and the main vital statistics of this pest were calculated under controlled conditions (25? 2º C, 70?5 % HR, 12L:12D) on chirosa (Mcol 2066), Ica Armenia (HMC1) and CMC 40 varieties. The results indicated that A. socialis females lived longer time (6.4 days) on the genotype CMC 40, moreover it showed a higher reproductive potential (33.8 eggs per female). On the contrary, the lowest time development (32.72 days) was obtained on the genotype HMC1. The three genotypes showed high survival rates; the highest was in HMC1 (89 %). The greatest whitefly population increase (r_m) was found in HMC1 (0.167 day^-1) and CMC40 (0.079 day^-1). The results of this biological and population parameters constitute a basic tool to elaborate control strategies. For A. socialis.

Keywords : Demographic parameters; longevity; fecundity; whitefly.

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