Bioecological aspects, damage and biological control of the coffee red spider mite, Oligonychus ilicis (McGregor, 1917) (Acari: Tetranychidae) on coffee plant. / Aspectos bioecolÃgicos, dano e controle biolÃgico do Ãcaro-vermelho do cafeeiro, Oligonychus ilicis (McGregor, 1917) (Acari: Tetranychidae)em cafeeiro

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The spider mite Oligonychus ilicis (McGregor) lives in the coffee plants (Coffea spp.) leaves superior surface, where spins web favoring the adherence of dust, debris and exuviae, giving to the leaves a dirt aspect. Due to its feeding behavior, leaves lose shine becoming tan. Iphiseiodes zuluagai Denmark &Muma, 1972, Amblyseius herbicolus (Chant, 1959) and Euseius citrifolius Denmark &Muma, 1970 (Acari: Phytoseiidae) are predatory mites frequently associated to the O. ilicis in coffee plants. This work was intended to quantify the damage caused by O. ilicis in coffee plants (Coffea arabica L.) through physiologic variables, population dynamics and biological control. Population dynamics of O. ilicis and its associated phytoseiid were accomplished in a 1.3 ha coffee field, at Experimental Station of EPAMIG, Lavras, MG, Brazil. The predation potential of the above mentioned phytoseiid species and the influence of the web spinning by O. ilicis in the protection against predation was verified in laboratory, through bioassays in arenas made with coffee plant leaves. Finally, the effect of O. ilicis attack was quantified by the photosynthetic efficiency of coffee plants infested with that mite. The conclusions about O. ilicis are: they occur the whole year, especially in the dry periods; are associated with natural occurring predatory mites of the family Phytoseiidae; produce web that protects them against predators and cause reduction of the photosynthesis tax. The use of biological control in a conservationist point of view and the predators increase as tactics will make possible this pest management with larger efficiency and smaller environmental impact.

ASSUNTO(S)

coffea arabica phytoseiidae phytoseiidae fotossÃntese coffea arabica predation web photosynthesis entomologia agricola teia predaÃÃo

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