Virus Diseases of Snap and Dry Beans
Virus diseases can commonly occur on both snap and dry bean crops in New York State and can result in reduced yields and inferior quality of the product. Because dry beans have longer vegetative cycle, viruses, in general are more destructive for this crop. Most bean viruses are spread by aphids in a nonpersistant manner, with insecticides providing little protection against virus spread during the season. In additions to being aphid transmitted, some bean viruses are seed-borne in bean or in other host and can be overwintered in cultivated plants and weeds. Nematodes can transmit two viruses, which cause only minor plant injury.