| Abstract Detail
Plant Protection Platt, H.W. (Bud) [1], Peters, Rick D. [1], Lazarovitz, George [2], Macdonald, Ian [3]. Phosphonate applied as tuber dip and soil drench for the control of late blight and pink rot of potatoes. LATE blight and pink rot of potatoes occur in almost all potato production areas. These diseases require significant disease management costs and can result in major tuber yield and quality losses. The causal agents for these diseases are Phytophthora infestans and P. erythroseptica, respectively. Successful management of these diseases is dependent on limiting the inoculum sources, preventing infection and limiting disease development most often through the use of efficacious and appropriately fungicides. However, with the recent occurrence of fungicide-insensitive strains of these two pathogens, there is a need for new chemistries for control of these diseases. Phosphonates have been developed as highly selective and environmentally benign chemicals for the control of plant diseases. In greenhouse plant studies, phosphonates were applied as a post-emergence drench to the potting soil followed by pathogen inoculations at difference time periods after the fungicide treatment. Pathogen inoculations involved either soil drench or foliar spray inoculation with P. erythroseptica or P. infestans, respectively. In stored tuber inoculation studies, phosphonate treatments were applied as a tuber dip either 3 days prior to or 3 days after inoculation with either of the pathogens at 3 tuber eyes. Phosphonate treatments significantly reduced disease development as compared to inoculated check treatments. Aspects of the disease management potential of these fungicide treatments on the occurrence of late blight and pink rot are presented.
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1 - Agriculture and Agri-Food Canada, 440 University Ave., Charlottetown, PE, C1A 4N6, Canada
2 - Agriculture & Agri-Food Canada, 1391 Sandford Street, London, Ontario, N5V 4T3, Canada
3 - Agriculture & Agri-Food Canada, 440 University Avenue, Charlottetown, PEI, C1A 4N6, Canada
Keywords:
Tuber Rot Control.
Session: Poster-6
Location: Ballroom CD/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 8:00 AM
Abstract ID:142 |
