Entomology, Department of
Date of this Version
1978
Citation
M. H. M. Galileo, E. A. Heinrichs. 1978. Retençáo foliar em plantas de soja (Glycine max (L.) Merrill), resultante da açáo de Piezodorus guildinii (Westwood, 1837) (Hemiptera, Pentatomidae), em diferentes níveis e épocas de infestaçáo. Anais de Sociedade Entomológica do Brasil Ano 7 (2): 89-98.
Abstract
Foliar retention in soybean (Glyaine max (L.) Merril) as effected by levels and period of infestation with Piezodorus guildinii (Westwood, 1837) (Herniptera, Pentatornidae)
The effect of stinkbug on foliar retention in soybean was studied. Field tests were carried out in Guaiba, Rio Grande do Sul, 1974/75. Soybean plants were artificially infested at various densities of Piezodorus guildinii (Westwood, 1837), per 0,5m of row and at different stages of soybean development by means of isolation cages. Foliar retention occurred when plants were infested continuosly, from full to the complete physiological maturity of the seed. This phenomenon was not observed when infestations were restricted only from bIoom to the beginning of pod formation. Infestations restricted to the period of seed development required at least six bugs/m of row to cause foliar retention, while those restricted to the period of physiological maturation of the seed required at least 10 bugs/m of row.
Dentre os problemas da cultura da soja, destaca-se a ação de varios insetos fitófagos, entre esses os pentatomídeos que afetam negativamente o indice de produtividade. Os pentatomideos acasionam danos a apreciaveis, sendo responsaveis pela redução do rendimento e qualidade da semente, como tambem pela ocorrência de retenção foliar. Esta consiste num atraso da maturação das plantas, permanecendo verdes as folhas, hastes e legumes após o período normal de maturação e, paralelamente, na formação de legumes chochos com sementes abortadas (DAUGHERTY et alii, 1964; GOMES, 1966: QUEIROZ et alii, 1971: ROWAN & PEREIRA, 1971; RIZZO, 1972; SINGH, 1973; CORSEUIL et alii, 1974; TODD & TURNIPSEED, 1974; PANIZZI, 1975; CORSO et alii, 1975). A retenção foliar tambem e referida como "soja louca" (VERNETTI et alii, 1969; GALLO et alii, 1970).