Data/hora: 03/07/2024 12:00:43

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	21/05/2010	
Data da última atualização: 	21/05/2010	
Autoria: 	BALDIN, E. L. L.; MARCHI, L. S.; SCHLICK, E. C.	
Título: 	Resistance of squash cultivars to Aphis gossypii.	
Ano de publicação: 	2009	
Fonte/Imprenta: 	Horticultura Brasileira, Brasília, DF, v. 27, n. 3, p. 366-370, jul./set. 2009.	
Idioma: 	Inglês	
Conteúdo: 	The Cucurbitaceae plants are damaged by attack of a wide spectrum of insects and microorganisms. Among the sucker insects causing damages on squash Cucurbita pepo (L.), the aphid Aphis gossypii (Glover) (Hemiptera: Aphididae) is pointed as one of the most important, once their nymphs and adults suck the sap of the leaves continuously, besides being potential vector of virus. The present research evaluated different cultivars, aiming to identify the resistance against this aphid. The cultivars Novita, Sandy, Caserta Cac Melhorada, Novita Plus, Samira, AF-2858 and Caserta TS were used in laboratory assays (T= 25±2ºC; RH= 70±10% and fotophase= 12 h). In the immature phase the duration of nymphal instars was evaluated, the total duration and their viability, confining individuals on leaf disks from cultivars. In the adult phase the duration of reproductive period, the fecundity and the biological cycle were observed. The cultivar 'Sandy' expressed high level of antibiosis and feeding non-preference against A. gossypii, increasing the nymphal stage and causing mortality near to 70%. Besides, this cultivar reduced the production of nymphs and the longevity of the insects. The 'Novita Plus' cultivar also induced significant nymphal mortality, however in lower levels than those verified in 'Sandy', indicating a moderate resistance.	
Palavras-Chave: 	Abobrinha italiana; Cucubita pepo; Entomologia agrícola; Variedade resistente.	
Categoria do assunto: 	--	
Registro original: 	Epagri-Sede (Epagri-Sede)