Interação de técnicas para o manejo fitossanitário de Anticarsia gemmatalis (Lepidoptera: Noctuidae)

• Autor(a) principal: Vianna, Ulysses Rodrigues
• Data de Publicação: 2009
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/865
• topic: Trichogramma; Resistência; Controle biológico; Lagarta da soja; Trichogramma; Resistance; Biological control; Soybean caterpillar; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE

Several Trichogramma (Hymenoptera: Trichogrammatidae) species parasitizing Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) eggs, the main soybean defoliator in Brazil. The egg parasitoid Trichogramma atopovirilia Oatman & Platner (Hymenoptera: Trichogrammatidae) is an agent of biological control of the soybean caterpillar Anticarsia gemmatalis Hubner (Lepidoptera: Geometridae), and the appropriate proportion of eggs and embryonic age of the host are important to obtain good rates of parasitism of these natural enemies. To enhance the action of parasitoids in the field, beyond the knowledge of biological parameters favoring parasitism in the field, in a integrated program pest management in the soybean crop, various techniques of control are considered, including the control and use of chemical plants resistant. To evaluate the impact of pest management practices and different cropping systems, the objective of this study was to evaluate the capacity of interaction techniques for the A. gemmatalis control. First, there was the selection of Trichogramma species and/or strains on A. gemmatalis eggs. Subsequently, the selected T. atopovirilia specie was submitted to the densities of 5, 10, 15, 20 and 25 A. gemmatalis eggs to determine the optimum mix of eggs for the parasitoid was also evaluated the age influence on embryonic parasitoid, so eggs were used with 12, 24, 36, 48, 60 and 72 hours. Where it was found that the ideal for the development of T. atopovirilia the proportion is 20 to 25 A. gemmatalis eggs in embryonic age from 24 to 48 hours. In possession of these results evaluate the preference of Trichogramma spp. parasitism in A. gemmatalis eggs from larvae fed on soybean resistant foliage and/or capable of soybean foliages. Cardboards containing eggs of the host reared in the two substrates were offered food for T. atopovirilia in systems of free choice and containment. In the test of choice parasitoid showed no preference for eggs from A. gemmatalis reared on soybean resistant or susceptible. Already in the test where the parasitoids were confined to the eggs of only one substrate food parasitism was higher in A. gemmatalis eggs reared on soybean resistant. The most efficient way to assess the impact on populations of the parasitoid is through the construction of life table of fertility, thus, was assessed the quality of A. gemmatalis eggs, fed of soybean resistant or susceptible foliage, the T. atopovirilia life table of fertility. Are offered daily to the parasitism of T. atopovirilia of A. gemmatalis eggs from reared with of soybeans resistant and susceptible foliage and artificial diet until the death of the parasitoids. The table of life was not affected by food substrates used. The results suggest that the association parasitoid - plant resistant (IAC-24) may be effective for the soybean caterpillar control.