Data/hora: 06/06/2024 14:03:40

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	24/04/1996	
Data da última atualização: 	03/11/2005	
Autoria: 	NOEL, G. R.	
Título: 	History, distribution, and economics.	
Ano de publicação: 	1992	
Fonte/Imprenta: 	In: RIGGS, R.D.; WRATHER, J.A., ed. Biology and management of the soybean cyst nematode. St. Paul: APS Press, 1992.	
Páginas: 	p.1-13.	
Idioma: 	Inglês	
Conteúdo: 	The soybean cyst nematode, Heterodera glycines, continues to spread world wide to all areas of soybean production. Evidence indicates that the nematode was introduced into the USA in soil from the Orient. During the late 1800's, soil was imported to obtain inoculum of the nitrogen-fixing bacterium Bradyrhizobium japonicum. In the early 1900's, prior to the use of commercial inoculant, spreading of bacterium-infested soil for inoculation of soybean was common throughout the area of soybean production. The large number of races of the nematode in the U.S. may have resulted from importation of soil from different locations and from inadvertent selection pressure exerted by growing hay-type, nematode-resistant soybean during the first half of the twentieth century. Due to needs for vegetable oil during WWII, soybean acreage for seed increased dramatically. Increases in acreage continued during the next three decades. The current soybean cyst nematode problem arose because of the abandonment of crop rotations in which soybean was grown once every 3 or 4 years. The severity of the problem has been exacerbated in the central portion of the USA during the late 1980's, in part because of abandonment of optimal crop rotation, resulting from programs designed to reduce corn production. In spite of various management practices and extensive use of genetic resistance, H. glycines has become the primary pest of soybean in the USA.	
Palavras-Chave: 	Aspecto economico; Distribution; Economic aspect; Nematode; Soybean.	
Thesagro: 	Distribuição Geográfica; Glycine Max; Heterodera Glycines; Historia; Nematóide; Soja.	
Thesaurus Nal: 	history.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (12160-1) - ADC - PL - -- - 632.6257 - R569b -  - DIS