ABSTRACT
The toxic effects of six phytossanitary products used for control of L. heveae were evaluated "in vitro" on the fungi Beauveria brongniartii (619); Verticillium lecanii (972); Metarhizium anisopliae (1144 and 1189); Paecilomyces fumosoroseus (1200), Sporotrix insectorum (1229) and Beauveria bassiana (1196). The products were added to culture media (PDA) in concentrations similar to those used in field conditions. Products were added to the liquid medium at approximately 50º C. After the solidification of the media in Petri dish, the microorganisms were inoculated at three points/dish. After incubation for 10 days (BOD, with 26±0.5° C, 70±10% RU and photophase of 12 hours), the average diameter of the colonies and of the conidia yield were measured. Decis and Nuvacron were compatible with B. brongniartii (619). Most of the combinations, except Decis, were compatible with V. lecanii (972). The fungus M. anisopliae (1144) was very sensitive for all of the formulations, except for isolate 1189, which was not affected by triclorfon, carbosulfan and metamidophos, demonstrating the genetic variability of isolates of a fungal species. Nuvacron and Stron were compatible with B. bassiana (1196), P. fumosoroseus (1200) and S. insectorum (1229). Marshal was compatible with B. bassiana (1196) and S. insectorum (1229), and Dipterex was compatible with P. fumosoroseus (1200).
KEY WORDS:
Rubber tree lacebug; pesticides; Hevea brasiliensis; mannagement; patogenus.