Physiological characterization of populations of Meloidogyne exigua associated with coffee crop in the Zona da Mata of Minas Gerais State Caracterizcao fisiologica de populacoes de Meloidogyne exigua associadas a cafeeiros na Zona da Mata de Minas Gerais

Saunders de Oliveira, D.; D'Arc de Lima Oliveira, R.; Vieira da Silva, R.

Nematologia Brasileira. Dezembro; 292: 279-283


Accession: 038544488

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Intraspecific variability has been characterized within Meloidogyne exigua populations from coffee roots in the Zona da Mata, Minas Gerais State. For evidence of any possible physiological variations within them, ten Of Such populations were inoculated in a greenhouse experiment on a North Carolina differential host and on plants of five other species reported as M. exigua hosts. This experiment was set Up in a completely randomized, factorial design, with six replications. It was evaluated 60 days after inoculation based on gall numbers, egg masses and number of eggs per root system. The last of these criteria was used to determine the reproductive factor. No physiologic variability was found within the Studied populations, which were all able to reproduce in 'Catuai' coffee (Coffea arabica), 'Rutgers' tomato (Lycopersicon esculentum), 'Early California Wonder' pepper (Capsicum annuum), clone SIC 23 cocoa (Theobroma cacao), 'Carioca' common beans (Phaseolus vulgaris) and 'Cristalina' soybean (Glycine max) plants. Coffee was used as the standard species for susceptibility, but the nematode populations in tomato and pepper plants reproduced more than those found in coffee. No Population reproduced in 'Charleston Gray' watermelon (Citrullus vulgaris) and 'Baia Periforme' onion (Allium cepa) plants, although a few galls appeared on their roots. 'Deltapine 6 F cotton (Gossypium hirsutum), 'NC 95' tobacco (Nicotiana tabactum) and 'Florunner' peanut (Arachis hypogaea) were found to be non-host plants, on whose plants no galls Could be found. These plant species and cultivars found unsuitable for M. exigua reproduction and should be indicated for areas infested by M. exigua to decrease its population.