Resumo

DOMENICO, Pavone  e  DORTA, Blas. Effect of agrochemicals on development of the entopathogenic fungus Nomuraea riley and its virulence on S. frugiperda. Bioagro [online]. 2010, vol.22, n.2, pp.105-114. ISSN 1316-3361.

The entomopathogenic fungus N. rileyi has great potential to be used in Integrated Pest Management Programs of Spodoptera frugiperda, because of epizootics generated in some corn fields in Venezuela. However, it is necessary to emphasize research on improved formulations in order to increase commercial products efficacy. One of the most important areas is fungal compatibility with chemicals commonly used in pest control. Compatibility of N. rileyi with certain chemical pesticides was evaluated. In general, the compatibility was dose-dependent or not affected at all. The insecticides Lannate and Mimic were ineffective at any concentration tested (1/10 to 1/1000 dilutions of the commercial product); the insecticides Atabron, Karate, the adherent Nu Film 17, and the herbicide Accent affected the fungus only at high concentrations (1/10 dilution of the commercial product), the fungicide Vitavax affected the fungus at any concentration (dilutions 1/10, 1/100 and 1/1000 of the commercial produtc). The bioassays suggest a synergistic effect between the fungus and some of the chemicals evaluated (Karate and Mimic) for the control of the insect, which would allow decreasing the use of toxic products in field, contributing with resistance pest management to chemicals products. It is also discussed the importance to complement these assays with ecological information to make effective applications. Additional.

Palavras-chave : Compatibility; pesticide; biocontrol; Zea mays.