Data/hora: 25/06/2024 00:32:06

Biblioteca(s): | Embrapa Agroindústria Tropical.
Data corrente: | 23/08/1993
Data da última atualização: | 23/08/1993
Autoria: | WAY, M. J.; HEATHCOTE, G. D.
Título: | Interactions of crop density of field beans, abundance of Aphis fabae Scopa., virus incidenc and aphid control by chemicals.
Ano de publicação: | 1966
Fonte/Imprenta: | Annals of Applied Biology, v.57, p.409-423, 1966.
Idioma: | Inglês
Conteúdo: | The number of Aphis fabae Scop. per plant and per acre developing on field beans (Vicia faba L.) was inversely related to seeding rate (i.e. plant density) except sometimes at very low rates; with equal numbers of plants per acre, fewer aphids developed on plants in rows IIin. than 22in.apart. Plots sown in mid-March with more than about 150,000 plants per acre were more attractive than less dense stands to colonizing alate A. fabae, but established colonies multiplied most on the sparsest and least on the densest plots. The number of plants per acre infected by pea leaf-roll virus was inversely related to planting density. There were more virus-infected plants on II in. than on 22 in. spaced rows-in contrast to the numbers of A. fabae. A single spray with demeton-methyl, timed to control A. fabae, did not significantly decrease virus incidence. Grain yield of sprayed plots were little altered by increasing the seed rate above a critical minimum, except in one year when the densest crops lodged. Increased yields from spraying were closely related to the numbers of A. fabae on unsprayed plots. Dense planting (more than 400,000 plants per acre) prevented or greatly decreased losses caused by A. fabae in unsprayed plots except in one year when the aphids were exceptionally abundant.
Palavras-Chave: | Feijao - afideo - controle quimico; Feijao - doencas; Feijao - plantio - densidade; Feijao - pragas; Feijao - virus - controle quimico; Pragas - controle - inseticida.
Thesagro: | Feijão; Vicia Faba.
Thesaurus Nal: | Aphis fabae.
Categoria do assunto: | --
Registro original: | Embrapa Agroindústria Tropical (CNPAT)
Exemplares: | CNPAT - (723-1) - EMB - SP - -- - SP 00985 -  - 92.00985 - DIS