| Abstract Detail
Production and Management LeMere, M. T. [1], Bussan, A.J. [2], Stevenson, Walter [3]. The effects of fumigation, nitrogen fertility, and varietal resistance to early dying (Verticillium dahliae) and early blight (Alternaria solani) on crop health and productivity. EARLY dying and early blight cause significant economic yield and quality losses in potato worldwide. Fungicides and fumigants are heavily relied upon for management of these diseases. Nitrogen fertilization influences plant health which alters crop response to both early dying and early blight. Fungicide and fumigation applications are costly and pose potential risks to workers and the environment. This research focused on quantifying fungicide, fumigant, and fertilizer requirements of new varieties with varying levels of susceptibility to early dying and early blight. Research trials were initiated to evaluate interactive effects of fumigation and nitrogen rates on disease development, yield, and quality of Russet Burbank, Freedom Russet, Bannock Russet, and Defender. The severity of early dying was highest on Russet Burbank while early blight severity was greatest on Freedom Russet. Overall, fumigation with metam sodium decreased the severity of both early dying and early blight on all varieties compared to non-fumigated plots. Higher nitrogen fertilization also reduced the severity of both early blight and early dying on all varieties The previous crop, red clover, may have reduced potato yield responses to applied nitrogen fertilizer. Improving early dying and early blight management through variety selection and optimal nitrogen fertility levels for each variety appears feasible and could reduce the need for application of fungicides and fumigants.
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1 - University of Wisconsin-Madison, Department of Plant Pathology, 1630 Linden Drive, Madison, WI, 53706, USA
2 - University of Wisconsin, Department of Horticulture, 1575 Linden Drive, Madison, WI, 53706, USA
3 - University of Wisconsin, Plant Pathology, 285B Russell Labs, 1630 Linden Dr., Madison, Wisconsin, 53706, USA
Keywords:
Early Dying
Early Blight
Fumigation
nitrogen
Varietal Resistance.
Session: PAA12-9
Location: Hall of Ideas Room E/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 11:00 AM
Abstract ID:302 |
