Predatory mites (Phytoseiidae) diversity in forest fragments and adjacent coffee plantations. / Diversidade de Ãcaros predadores (Phytoseiidae) em fragmentos florestais e cafezais adjacentes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Few informations are available on predatory mites fauna in brazilian natural environments adjacents to coffee agroecosytems, as well as the influence of neighbouring vegetation as predatory mites reservoir. This study evaluates the diversity of these organisms in forest fragments and adjacent coffee plantations. Samples were made on the following forest species: Calyptranthes clusifolia (Miq.) (Myrtaceae), Esenbeckia febrifuga (A. St. - Hill) (Rutaceae), Metrodorea stipularis(Mart.) (Rutaceae) e Allophylus semidentatus (A. St. - Hil et al.) (Sapindaceae). Sampling was carried out in eight forest fragments in South Minas Gerais State, ranging from 5 to 51 ha, all with adjacent forest plantations, in June (considered the end of the raining season) and October (considered the end of the dry season) of 2004 and 2005. Washing of the leaves removed the mites which were then mounted in Hoyerâs medium on microscopic slides. There were 8709 mites collected, 38 species in 16 families, 7647 in forest fragments and 1062 on adjacent coffee plantations. Faunistic analysis revealed that the Phytoseiidae were the most abundant and numerous in both environments studied. Iphiseiodes zuluaguai Denmark &Muma, 1972 was the species with the best indexes in the coffee agroecossistems. In the forest fragments Amblyseius herbicolus Chant, 1959, Iphiseiodes neonobilis Denmark &Muma, 1978, Leonseius regularis DeLeon, 1965 and Euseius alatus DeLeon, 1966 were classified as dominant, very abundant, very frequent and constant. Phytoseiids were highly abundant in all forest fragments of all dimentions studied, and in all sampling dates, suggesting that they may migrate from these epecies toward coffee plantations and vice-versa. Native vegetation host predatory mites, which are natural enemies of pest mites on coffee crops, allowing the development of ecologic management programs with areas of natural vegetation adjacent to coffee agroecossistems.

ASSUNTO(S)

entomologia agricola vegetaÃÃo nativa; coffea arabica; acari; manejo de pragas natural vegetation; coffea arabica; acari; pest management.

ACESSO AO ARTIGO

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