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Project Leader: James W. Lorbeer
(Professor), Department of Plant Pathology, Cornell University, Ithaca,
NY 14853.
Cooperators: J.S. Haudenshield
(Post Doctoral Associate), Department of Plant Pathology, Cornell University,
Ithaca, NY 14853; New York onion growers and Orange County Vegetable
Improvement Cooperative Association.
Type of grant: Biological control
and pest biology.
Project location(s): The findings
of this study could be applied on organic soils cropped to onion in
New York and elsewhere in Northeastern North America.
Abstract.
Two approaches (field sampling and
miniculture) were used to identify vegetable and field crops and other
plant species which regulate population levels of Burkholderia cepacia
in organic soils cropped to onions, and for rotation with onions to
reduce the occurrence of bacterial canker and sour skin of onions caused
by the pathogen. It was found that crops such as corn and soybean may
aggravate disease incidence if used in rotation to onion, whereas other
crops such as radish, lettuce, beets, carrots, millet, and carrot and
turnip may offer profitable and disease-ameliorating rotation alternatives.
Furthermore, baseline trends are becoming apparent that allow the comparison
of cropping strategies from one field to another as relating to the
population levels of B. cepacia that the fields support
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