Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection
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- 作者：R. O. Nyankanga (1) (3)
H. C. Wien (1)
O. M. Olanya (2) - 关键词：Cultivars ; Cultural practices ; Mulch ; Potato hilling ; Phytophthora infestans ; Tuber blight
- 刊名：Potato Research
- 出版年：2008
- 出版时间：June 2008
- 年：2008
- 卷：51
- 期：2
- 页码：101-111
- 全文大小：191KB
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H. C. Wien (1)
O. M. Olanya (2)
1. Cornell University, 134A Plant Science Building, Ithaca, NY, 14853, USA
3. Department of Plant Science and Crop Protection, University of Nairobi, P.O. Box 30197, Nairobi, Kenya
2. USDA-ARS, New England Plant, Soil and Water Laboratory, Orono, ME, 04469, USA
文摘
Foliar and tuber blight caused by Phytophthora infestans accounts for significant losses in potatoes in field and storage. Nevertheless, limited research has been published on the effects of cultural practices on late blight control. Field experiments were conducted in two years on Howard gravely loam soil in New York State to evaluate the effectiveness of mulching using oat straw and hilling in preventing tuber blight infection for cvs Allegany and Katahdin. Potato hilling and mulching had little effect on foliar blight development. The cultivar affected the disease development in the foliage, with cv. Allegany showing lower foliar late blight than cv. Katahdin. Tuber blight incidence averaged 25% for cv. Allegany and 3% for cv. Katahdin in hilled plots, while in the mulched plots the incidence of tuber blight averaged 33% for cv. Allegany and 10% for cv. Katahdin. The straw hay mulch was ineffective in tuber blight control. Tubers set at a soil depth of more than 7?cm had lower tuber blight incidence than shallow tubers set at a depth of less than 7?cm. In both years, hilling provided partial protection of tubers but its effectiveness was limited in the presence of favourable conditions for late blight development. Even though large hills had proportionally a lower tuber blight incidence than medium-sized hills, the difference between the different hill sizes was not significant. These studies suggest that the use of cultivars with foliage resistance to late blight in combination with cultural practices may partially reduce the incidence of tuber blight.