Larvae of Sciaridae flies (Diptera) cause considerable damage to the mushroom Agaricus blazei (Murrill) ss. Heinemann in Brazil. Brazilian growers have had considerable difficulties in controlling this pest. The objective of this work was to test the effect of the predatory Laelapidae mite Stratiolaelaps scimitus (Womersley) as a control agent of Bradysia matogrossensis (Lane) in cultures of A. blazei. The work corresponded to an evaluation of the efficiency of that predator when released in boxes containing each about 15 L of commercial mushroom compost naturally infested with the pest. The results showed a significant effect of that predator on the population of B. matogrossensis. The release of either 665 or 1330 S. scimitus per box significantly reduced the pest population to levels that, according to grower's experience, apparently could not cause considerable damage. The positive results obtained warrant the conduction of complementary studies to determine the lowest rates of the predator that could still produce acceptable levels of control.
Tenuipalpus orchidofilo n. sp. (Acari: Tenuipalpidae) is described from Brazil based on the mobile immatures and adult stages of both sexes collected on the orchid Arundina graminifolia (D. Don) Hochs.
por garantirem condições para que eu realizasse meus estudos Ao meu irmão, Sérgio Alexandre Prado Freire, pela eterna amizade Ao meu noivo Lásaro Vanderlei Fernandes da Silva por sua compreensão e companheirismo durante essa etapa de minha vida Aos amigos verdadeiros que sempre estiveram ao meu lado DEDICO 4 AGRADECIMENTOS Ao Prof. Dr. Gilberto J. de Moraes, pela orientação e valiosas contribuições para minha formação profissional e pessoal. Ao Prof. Dr. Carlos H. W. Flechtmann, que com seu imenso conhecimento muito me auxiliou na elaboração do trabalho, e também pela descontração durante os "cafezinhos". Ao Sr. Lásaro V. F. Silva, técnico de laboratório, pelo auxílio em coletas, manutenção de material em laboratório e aquisição de literatura.
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