Flutuacoes de populacoes de coleópteros nocivos ao cacaueiro no Espírito Santo, Brasil
The Chrysomelid beetle Maecolaspis ornata and the weevils Lordops aurosa, Naupactus bondari, Naupactus sp. and Lasiopus cilipes are economically important in the cultivation of cacao in the State of Espirito Santo, Brazil, owing to the leaf damage they cause, which reduces tree photosynthesis with a consequent adverse effect on growth and fruit production. The object of the present study was to correlate population fluctuations of this species with climatic and vegetative dada of the cacao tree, which would serve as the basis for an efficient, economic chemical control. The work was carried out on eight cacao farms near the town of Linhares, Espirito Santo. Monthly population samples from 25 cacao trees were taken from each farm, using a knock-down method with 12 per cent BHC, applying the insecticide on a rotational basis. Leaf flushing showed highly significant positive correlations with the population of M. ornata 2 months after its initiation while for L. aurosa they were positive and significant at the 5 per cent level of probability, 1 and 2 months after. In the case of N. bondari, there was a significant, positive correlation in the same month. The total population, represented by the sun of the individual population of the five species, showed positive correlation in the same month, 1 month and most significantly 2 months after the initiation of leaf flushing. The results indicate that insecticides should be applied at the beginning of leaf flushing when the population of these leaf eating pests are at their lowest level
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| Format: | biblioteca |
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1972
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| Subjects: | THEOBROMA CACAO, COLEOPTERA, EVOLUCION DE LA POBLACION, CAMBIO CLIMÁTICO, TEMPERATURA, LLUVIA, MAECOLASPIS ORNATA, LORDOPS AUROSA, NAUPACTUS BONDARI, LASIOPUS CILIPES, ESPIRITO SANTO, BRASIL, |
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