Identification of cowpea Vigna unguiculata (L.) Walp. genotypes resistant to Callosobruchus maculatus (Fabr.) (Coleoptera: Bruchidae)

Lima, M.P.L. de; Oliveira, J.V.; Barros, R.; Torres, J.B.

Neotropical Entomology 30(2): 289-295

2001


ISSN/ISBN: 1519-566X
Accession: 003801373

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Abstract
The present work aimed to identify sources of resistance in 30 cowpea genotypes, from EMBRAPA Meio-Norte, to Callosobruchus maculatus. In a no choice test, two pairs of insects were confined on 30 grains of each genotype. To evaluate the resistance of the genotypes, the parameters number of eggs/female, viability of eggs, duration and viability of the immature phase, natural rate of population increase and resistance index were used. Using this index the genotypes IT89KD-245, TE90-180-10F, CNCx 409-12F, IT86D-716, IT89KD-260 and BR17-Gurgueia were classified as moderately resistant; CNC 0434, CNCx 405-17F, TE90-170-76F, TVu-249, IT89KD-381, BR14-Mulato, TE87-98-8G, TE87-1115-10G, CNCx 955-1F, CNCx 676-51F, TE87-98-13G, TE90-172-42E and TE87-98-9G-2 as susceptible, and Bico de Pato, TE90-180-3E, TE90-179-14E, TE90-170-29F, Monteiro, TE84-27-7G, CNCx 409-11F, TE90-172-33F, TE90-180-88E, TE90-170-40F and TE90-180-13E as highly susceptible. The genotypes IT89KD-245 and CNCx 955-1F showed non-preference for oviposition. The genotype IT89KD-245 was the only one classified as resistant, showing the least natural rate of population increase, the smallest viability and the largest duration of the immature phase, expressing antibiosis.