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Nova Londrina, Brazil

Bortolotto O.C.,Federal University of Parana | Mikami A.Y.,Federal University of Parana | Bueno A.D.F.,Federal University of Parana | Bueno A.D.F.,Laboratorio Of Controle Biologico | And 2 more authors.
Ciencia Rural | Year: 2016

This study investigated the development of Dichelops melacanthus (Hemiptera: Pentatomidae) at different temperatures (19±1°C, 25±1°C and 31±1°C) reared on 2B688Hx (expressing Cry1F insectice protein to control lepidopterans target) immature corn grains. The temperature of 19±1°C impaired the development of D. melacanthus and recorded the highest mortality of nymphs, lower weight and adult females laid no eggs. Moreover, the length of the nymphal biology, adult weight, fecundity and viability of eggs did not differ between temperatures 25±1°C and 31±1°C. It was also shown that the biological aspects of green belly stink bugs fed with 2B688Hx immature grains of corn do not differ from that develop with 2B688 isoline. This study showed that the biological cycle of D. melacanthus is favored at warmer temperature (until 31±1°C), and the consume of immature corn grain 2B688Hx does not affect its development. © 2015, Universidade Federal de Santa Maria. All Rights Reserved. Source


de Oliveira H.N.,Laboratorio Of Controle Biologico | Antigo M.R.,Federal University of Grande Dourados | de Carvalho G.A.,Federal University of Lavras | Glaeser D.F.,Brazilian National Council for Scientific and Technological Development | Pereira F.F.,Federal University of Lavras
Bioscience Journal | Year: 2013

Diatraea saccharalis (Fabricius) is one the most important pest of sugarcane crops and Trichogramma galloi (Zucchi) an egg parasitoid, is considered an important natural enemy. During the management of this crop some products can affect the performance of this parasitoid, being necessary to found selective products. For this reason, the aim of this study was to evaluate the effects of some insecticides used in sugarcane crop on adults of T. galloi. The products tested were chlorantraniliprole, ethiprole, thiametoxan, triflumuron, lambda-cialotrina+thiametoxan, fipronil and Metarhizium anisopliae (Metsch.), in the highest dosages recommended by sugarcane. Females of T. galloi, with 24h, received eggs from D. saccharalis that were immersed in the solutions of each product. It were evaluated the mortality and the number of parasitized eggs of F0 generations of T. galloi; and the emergence of F1. Chlorantraniliprole, M. anisopliae, triflumuron, were classified was harmless (class 1) for mortality of T. galloi and for parasitism, these insecticides were harmless or slightly harmful. About the emergence, chlorantraniliprole and M. anisopliae were harmful and triflumuron, moderately harmful. The other products were harmful to survival of T. galloi and were not harmless to parasitism and emergence this parasitoid. In this sense, chlorantraniliprole and M. anisopliae were classified as a selective (harmless or slightly harmful) for all the parameters evaluated for T. galloi and could be recommended to management program to control D. saccharalis. Source


Gava C.A.T.,Laboratorio Of Controle Biologico | Menezes M.E.L.,Brazilian National Council for Scientific and Technological Development
Revista Ciencia Agronomica | Year: 2012

Soil borne pathogens have become a strong limitation to the cultivation of melons under the edaphicclimatic conditions prevailing in the sub-medium San Francisco River valley. Since control of this group of pathogens using fungicides hás been ineffective, it is necessary to develop alternatives that can be applied to the integrated management of diseases caused by these pathogens. To this end, four isolates of Trichodema sp. were evaluated for their ability to colonise the rhizosphere of melon plants under controlled conditions, and their efficiency in the control of pathogens under field conditions. The experiments were carried out using melon seeds treated with formulations of conidia of the fungi T. harzianum LCB47, T. viridae LCB48, T. koningii LCB49 and T. polysporum LCB50. Under the experimental conditions, the treatments LCB47, LCB48 and LCB49 presented propagule counts in the rhizosphere, statistically similar to one another (of 4.54, 5.81 and 5.66 log 10 CFU g -1 root, respectively) and significantly higher than LCB50 (3.21 log 10 CFU g -1 root). In the field experiment, it was found that the treatments inoculated with the isolates LCB50 and LCB49, showed an incidence of disease similar to each other (24.7 and 28.6% of symptomatic plants, respectively) and a greater effective control than the others. These treatments resulted in a larger number of plants in the planter at the end of the experiment and a consequently higher fruit yield. Thus, it can be concluded that the isolates, T. koningii LCB49 and T. polysporum LCB50, show potential for use in the biological control of soil pathogens in the melon in the San Francisco River valley. Source


De Oliveira H.N.,Laboratorio Of Controle Biologico | Gomez S.A.,Laboratorio Of Controle Biologico | Rohden V.S.,Laboratorio Of Controle Biologico | Arce C.C.M.,Laboratorio Of Controle Biologico | Duarte M.M.,Laboratorio Of Controle Biologico
Pesquisa Agropecuaria Tropical | Year: 2010

Erinnyis ello (Lepidoptera: Sphingidae) is one of the main cassava crop pests and, among its natural enemies, the egg parasitoid Trichogramma (Hymenoptera: Trichogrammatidae) is the most important. This research records the occurrence of Trichogramma manicobai, Trichogramma marandobai, and Trichogramma pretiosum on E. ello eggs found in cassava crops, in Mato Grosso do Sul State Brazil. Source

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