Gerações sucessivas de Thyrinteina arnobia (Lepidoptera: Geometridae) em Mirtáceas nativas e exótica / Successive generations of Thyrinteina arnobia (Lepidoptera: Geometridae) in native and exotic Myrtaceae




Thyrinteina arnobia (Lepidoptera: Geometridae) is found on native plants of the family Myrtaceae and also in sporadic outbreaks in eucalypt plantations, exotic Myrtaceae introduced in Brazil. The occurrence of outbreaks of this insect has been attributed to its migration from native plants to eucalypt, what may be favored by the abundance of resources and lower numbers and diversity of natural enemies. The objective of the first chapter was to study the biology of T. arnobia in the field and to compare its development during successive generations in the exotic plant, Eucalyptus cloeziana and two native ones, Psidium catteleianum sabine and Psidium guajava. The duration and the survival of the larva stage of T. arnobia were evaluated in the field and its reproduction in the laboratory. The larva stage of T. arnobia was not affected after successive generations on P. guajava and E. cloeziana plants but P. catteleianum sabine increased the duration and reduced the survival of this stage for this insect. In spite of the negative effects on the larval stage by P. catteleianum sabine, the reproductive parameters of T. arnobia were similar with these three plants. The change between plants during successive generations may be important for the biology of T. arnobia, what can guarantee a wide range of hosts for this insect. The objective the chapter 2 was to study the effect of feeding on honey solution on the fecundity and longevity of T. arnobia adults. Pairs of this insect were fed or not with 15% honey solution. The pre-oviposition, oviposition and pos-oviposition periods and the longevity, fertility, egg incubation period and numbers of egg and egg masses of T. arnobia were evaluated. The reproductive capacity and the longevity of females of this insect were similar with honey or not, but fed males of T. arnobia had longer longevity. This can be due to the fact that males are more active because they need to find females for mating. This increases its energy necessity what can be compensated by feeding.


reproduction lepidóptero desfolhador larval development reprodução desenvolvimento larval leaf-cutting lepidoptera zoologia aplicada

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