Data/hora: 04/06/2024 02:05:32

Biblioteca(s): | Embrapa Soja.
Data corrente: | 04/01/2001
Data da última atualização: | 09/03/2006
Autoria: | CORSO, I. C.; GAZZONI, D. L.
Título: | Insecticide selectivity for predators and parasitoids of soybean insect pests.
Ano de publicação: | 2000
Fonte/Imprenta: | In: INTERNATIONAL CONGRESS OF ENTOMOLOGY, 21., 2000, Foz do Iguassu. Abstracts... Londrina: Embrapa Soja, 2000.
Volume: | v.2
Páginas: | p.672.
Idioma: | Inglês
Conteúdo: | With the purpose to evaluate the effect of several chemical and biological insecticides on the population of beneficial insects, a field experiment was carried out in the Londrina (Brazil) region, using a flat area on a grower soybean field. The experimental desing used was the randomized block, with three replications, and the plots measured 100 x 100 m. Insecticides were applied in the beginning of January, when soybeans cv BR-16 reached the flowering stage, supposedly for the control of the velvetbean caterpillar. A second application was performed two months later, simulating the control of the stink bug population. Insecticides and rates (g ia.ha -1) used (first/second application) were: 1. Endosulfan (175) / endosulfan (437); 2. Lambdacyalothrin (3,75) / lambdacyalothrin (7.5); 3. Monocrotophos (80) / monocrotophos (150); 4. Baculovirus anticarsia (20 g p.c.) / monocrotophos (100) + NaCl (0,5%); 5. Cleck. Insecticides were applied with a bar sprayer, delivering 180 l/ha. Four weekly samplings using the shock method were made on each plot, each one consisting of 16 m of soybean row. A broad spectrum insecticide was applied on the area to be sampled, where clothes were placed on the soil. Afther 15 minutes of the application, insects were collected, transferred to plastic bags and counted in the laboratory. During the last six weeks of the experiment, stink bugs eggs were collected in the field and reared in the laboratory, to observe the index of parasitism. The statistical analysis of the data revealed no significant differences between the predators or parasitoids population observed on the different treatments. Also no differences were observed on the hatching of parasitoids from the eggs masses collected in the field, thus showing that either the insecticides had no impact on the beneficial population, or its population recovered quickly, thus preventing differences from being detected by the evaluation methodology used.
Palavras-Chave: | Brasil; Controle integrado de praga; Parasitoide; Soybean.
Thesagro: | Controle Biológico; Inseto; Predador; Soja.
Thesaurus Nal: | biological control; Brazil; Insecta; integrated pest management; parasitoids; predators.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (18173-1) - UMT - PL - -- - RF 339 -  -  - DIS