Ecology of Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) on coffee plantations in the State of São Paulo / Ecologia do ácaro da mancha-anular (Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) em cafeeiros no estado de São Paulo




The knowledge on the interactions among Brevipalpus phoenicis (Geijskes), other phytophagous or predaceous mites and coffee plants is still insufficient to establish an adequate management program for this crop, in order to minimize the problems caused by coffee ringspot virus (CoRSV), transmitted by B. phoenicis. In spite of the problem, little is known on the diversity of mites, as well as on the population dynamics of B. phoenicis and its natural enemies on coffee plants of several important commercial cultivars. Information on the impact of agrochemicals on the population of mites on coffee plantations are practically inexistent. However, it is known that some insecticides and fungicides can affect the population of predaceous mites inducing pest mite population increases. Characterizing the diversity of mites on two important coffee-producing areas of the state of São Paulo (Jeriquara and Garça), it was observed that the diversity of mites was higher in Jeriquara county than in Garça. A total of 13,052 mites was collected in both studied areas, of which 7,155 in Jeriquara and 5,897 in Garça. Of the total of 108 species identified in this study, 45 species were observed in both localities (Garça an Jeriquara), which presented 56% of similarity. The most frequent predaceous mites on leaves were Euseius concordis (Chant), E. citrifolius Denmark &Muma and Agistemus brasiliensis Matioli, Ueckermann &Oliveira, among others. The study on the diversity of mites in different coffee cultivars (Coffea canephora cv. ‘Apoat㒠and C. arabica cv. ‘Mundo Novo’, ‘Icatu Vermelho’, ‘Icatu Amarelo’ and ‘Catuai Amarelo’), carried out in Garça, showed the highest species richness and the highest number of specimens for the leaf surface of ‘Apoatã’. ‘Icatu Vermelho’ was the cultivar which presented the highest uniformity of distribution of mite species and ‘Apoat㒠was the cultivar with the lowest uniformity. The species B. phoenicis was found in higher abundance in ‘Apoatã’, representing 61% of all specimens collected. E. citrifolius occurred in higher number on the cultivar ‘Mundo Novo’ and E. concordis in ‘Apoatã’. The stigmaeid mite A. brasiliensis occurred in higher number on the cultivar ‘Icatu Vermelho’ and Z. malvinae was present in similar populations on all coffee cultivars. The study on the effect of pesticides on the mite diversity, showed the lowest diversity for the treatment with triadimenol + dissulfoton, and the highest diversity was observed for treatment with deltamethrin + triazophos. B. phoenicis presented population reduction for the treatments aldicarb, but an increase of around two times for treatments with triadimenol + disulfoton and with thiamethoxam. The treatments with the highest similarities in species composition were: cartap and control (without pesticide), and thiamethoxam and ethion; and the treatments with the lowest similarities were: control and aldicarb, aldicarb and cartap, and aldicarb and deltamethrin + triazophos. A significant reduction in A. brasiliensis population was detected for the treatments with aldicarb and thiamethoxam. E. citrifolius population was affected significantly by cartap.


diversity of mites controle biológico domácias domatia biological control diversidade de ácaros species interactions interação entre espécies

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