Data/hora: 05/06/2024 04:25:41

Biblioteca(s): | Embrapa Soja.
Data corrente: | 17/11/2000
Data da última atualização: | 09/03/2006
Autoria: | OLIVEIRA, E. D. M.; PANIZZI, A. R.
Título: | Performance and feeding preference of nymphs and adults of piezodorus guildinii (Hemiptera: Pentatomidae) on soybean pods at different developmental stages.
Ano de publicação: | 2000
Fonte/Imprenta: | In: INTERNATIONAL CONGRESS OF ENTOMOLOGY, 21., 2000, Foz do Iguassu. Abstracts... Londrina: Embrapa Soja, 2000.
Volume: | v.1
Páginas: | p.77.
Idioma: | Inglês
Conteúdo: | A study was conducted in the laboratory to test the suitability of soybean (Glycine max) pods at different phenological stages of development (R3-R8) on the performance of nymphs and adults of the small green stink bug, Piezodorus guildinii (Hemiptera: Pentatomidae). In the field, a survey was carried out to determine the population fluctuation of this stink bug with relation to the soybean plant phenology. In the laboratory, nymphs showed a better performance when fed soybean pods during the podfilling stage (R5-R6), compared to the remaining stages of pod development. Despite nymphs required similar time to complete development and attained similar body weight at adult emergence, mortality was smaller at stage R6 (47.5%) than on the remaining stages of pod development. On soybean pods without seeds (R3-R4) and on soybean pods mature (R8) nymph mortality was 100%. On soybean pods beginning maturation (R7) and on soybean seeds mature, mortality reached 81.7 and 76.7%, respectively. When pod pilosity was removed, nymph mortality on soybean pods at R6 increased to 60.0%, and decreased to 35% on soybean pods at R6 with pilosity. P. guildinii adults showed better  performance on soybean pods at stages R5 and R6, compared to soybean pods at R3, R4, R7, R8, and mature seeds (R8MS). Females and males showed greater longevity when fed on soybean pods at R5; 50% of females oviposited when fed on soybean pods at R5, and no females oviposited when fed on soybean pods at R3 or R4; at R7, 20%; at R6 45% of the females oviposited; at R8, 10%, and on R9MS, 5% of the females laid eggs. Pre-oviposition period was shorter when females fed on soybean pods at R6 and longer when they fed on soybean pods at R7. Mean number of egg masses and total number of eggs was greater for females fed on soybean pods at R5;  greater female body weight was observed on soybean pods at R6 at day 29 of adult life. P. guildinii showed greater feeding activity on soybean pods at R5, and visited more often soybean pods at R6, than soybean  pods at R3, R7 or R8. Adults colonized soybean from the beginning of pod filling (R5), and nymphs from the period pods were completely filled (R6); both, nymphs and adults peaked at maturation (R8). These results indicate that P. guildinii nymphs and adults show a better performance when fed on filling soybean pods, and, when the pods are elongating or maturing, the performance is less satisfactory.
Palavras-Chave: | Biology; Brasil.
Thesagro: | Biologia; Glycine Max; Heteroptera; Inseto; Soja.
Thesaurus Nal: | Brazil; Insecta.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (17984-1) - UMT - PL - -- - RF 339 -  -  - DIS