บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Control of skin spot and silver scurf on stored cv. King Edward potatoes by chemical and non-chemical methods.

Hide, G. A.; Hall, S. M.; Read, P. J.;

Annals of Applied Biology Year: 1994 Vol: 125 Issue: 1 Pages: 87-96 Ref: 9 ref.

1994

บทคัดย่อ

Control of skin spot and silver scurf on stored cv. King Edward potatoes by chemical and non-chemical methods.

ABSTRACT :

 

In 3 years, seed tubers of cv. King Edward were planted in field experiments and diseases assessed on the daughter tubers after storage for 24-26 weeks. In 1991 and 1992, the seed tubers were treated with a mixture of thiabendazole and imazalil at 2 rates. Tubers were harvested on several dates from late Aug. to early Oct. and dried under different conditions before storage. In 1990, silver scurf (Helminthosporium solani) after storage was decreased equally by dry curing for 2 weeks and windrowing for 2 h whereas skin spot (Polyscytalum pustulans) was decreased most by dry curing, and these effects were greater the earlier tubers were harvested. In 1991, dry curing for 2 weeks decreased skin spot and silver scurf more than dry curing for 1 week, and skin spot was slightly decreased by windrowing for 2 h; windrowing improved the control of both diseases when tubers were subsequently dry cured. In 1991 and 1992 fungicide treatment of seed tubers greatly decreased skin spot after storage and was al

so effective against silver scurf, but increased black dot (Colletotrichum coccodes) when tubers were harvested in Sep. or Oct. Skin spot was controlled equally well by the 2 rates of fungicide but silver scurf was less well controlled when the dose was decreased by 75%. It is suggested that amounts of fungicide applied to seed tubers could be decreased provided that the efficiency of application is improved and that crops are harvested early and dried before storage.