Submitted to: International Coloquim on Invertebrate Pathology and Microbial Control
Publication Type: Abstract Only
Publication Acceptance Date: April 12, 2002
Publication Date: August 15, 2002
Citation: SOSA-GOMEZ, D.R., HUMBER, R.A. ENTOMOPATHOGENS ASSOCIATED WITH SOYBEAN/WHEAT PRODUCTION SYSTEMS IN BRAZIL AND ARGENTINA. INTERNATIONAL COLOQUIM ON INVERTEBRATE PATHOLOGY AND MICROBIAL CONTROL. 2002.
We summarize a 10-year survey of eukaryotic pathogens recorded from insects and mites affecting soybean and winter wheat in Brazil and Argentina. The foremost disease in soybean pests was N. RILEYI on ANTICARSIA GEMMATALIS (VBC), PSEUDOPLUSIA INCLUDENS and RACHIPLUSIA NU (Noctuidae) and also in Argentina on SPILOSOMA VIRGINICA (Arctiidae). PANDORA GAMMAE. (Entomophthorales) attacked larval Plusiinae in Dec-Jan. In wet seasons, PAECILOMYCES TENUIPES infects many VBC and Plusiinae pupae. PSEUDOPLUSIA INCLUDENS and VBC were attacked in Jan-Feb by a ZOOPHTHORA species. Among seed pests, a FURIA sp. (Entomophthorales) attacked PIEZODORUS GUILDINII (Pentatomidae) nymphs. PAECILOMYCES FUMOSOROSEUS, a generalist fungus, attacked both root feeding stinkbug SCAPTOCORIS CASTANEA (Cydnidae) and dense populations of BEMISIA ARGENTIFOLII in Jan. PAECILOMYCES AMOENOROSEUS commonly attacked LAGRIA VILLOSA (Lagriidae) Dec-Mar). A species of NEOZYGITES sp. affected two-spotted spider mite, TETRANYCHUS URTICAE. ZOOPHTHORA RADICANS infected NABIS sp. (Nabidae) and BEMISIA ARGENTIFOLII. An unidentified protozoan flagellate attacked the stinkbugs NEZARA VIRIDULA (up to 30% infected) and PIEZODORUS GUILDINII (up to 7% infected). In wheat, a complex of fungal epizootics of ENTOMOPHAGA AULICAE, PANDORA sp. and ZOOPHTHORA sp. were found in PSEUDALETIA SEQUAX (Noctuidae) in Jul-Aug, just as ENTOMOPHAGA GRYLLI (Entomophthorales) was epizootic on BACACRIS PUNCTULATUS (Acrididae). Less specific fungi (e.g., BEAUVERIA BASSIANA, METARHIZIUM ANISOPLIAE, and P. FUMOSOROSEUS) attacked diverse species of Chrysomelidae, Curculionidae, Scarabaeidae, and Pentatomidae. Batkoa apiculata attacked L. VILLOSA adults on soybean (Jan) and on wheat (Aug). We also found PANDORA NEOAPHIDIS on the aphids METOPOLOPHIUM DIRHODUM and RHOPHALOSIPUM PADI on wheat.