Author(s): BUENO, R. C. O. de F.; BUENO, A. de F.; MOSCARDI, F.; PARRA, J. R. P.; HOFFMANN-CAMPO, C. B.

Summary: BACKGROUND: Defoliation by Anticarsia gemmatalis (H ¨ ubner), Pseudoplusia includens (Walker), Spodoptera eridania (Cramer), S. cosmioides (Walker) and S. frugiperda (JE Smith) (Lepidoptera: Noctuidae) was evaluated in four soybean genotypes. A multiple-species economic threshold (ET), based upon the species? feeding capacity, is proposed with the aim of improving growers? management decisions on when to initiate control measures for the species complex. RESULTS: Consumption by A. gemmatalis, S. cosmioides or S. eridania on different genotypes was similar. The highest consumption of P. includens was 92.7 cm2 on Codetec 219RR; that of S. frugiperda was 118 cm2 on Codetec 219RR and 115.1 cm2 on MSoy 8787RR. The insect injury equivalent for S. cosmoides, calculated on the basis of insect consumption, was double the standard consumption by A. gemmatalis, and statistically different from the other species tested, which were similar to each other. CONCLUSIONS: As S. cosmioides always defoliated nearly twice the leaf area of the other species, the injury equivalent would be 2 for this lepidopteran species and 1 for the other species. The recommended multiple-species ET to trigger the beginning of insect control would then be 20 insect equivalents per linear metre.

Publication year: 2011

Types of publication: Journal article

Unit: Embrapa Soybean

Keywords: Anticarsia Gemmatalis, Controle biologico, Economia agricola, Folhagem de soja, Lagarta, Lagarta-falsa-medideira, Praga de planta, Pseudoplusia Includens, Soja, Soybeans