Root, bulb, leafy and brassica vegetable pest report – 6 June 2013

See below for the degree days accumulated from April 1^st until June 6^th, 2013.These values are provided as guidelines only. Local environments, soil type, field history, etc. are likely to influence activity of these pests.

Thresholds for emergence of first generation onion maggot fly adults have been reached in all areas. On sticky traps used for monitoring by the Muck Crops Research Station, onion maggot fly counts have been increasing since last week. First generation cabbage maggot adults have likely emerged in all areas for which degree days are calculated for. For all areas, accumulated degree days indicate emergence of first generation carrot rust fly adults, if resident populations are present. Carrot rust flies were caught earlier this week on traps at the Muck Crops Research Station in the Holland Marsh. If resident populations are present, carrot weevil have likely started to lay eggs in all areas as indicated by accumulated degree days. In the Windsor area, degree days indicate 90% oviposition of carrot weevil. Tarnished plant bugs have likely emerged in all areas; however, the Muck Crops Research Station scouts have not seen tarnished plant bugs on celery in the Holland Marsh yet. I’ve seen tarnished plant bug on sticky traps as by-catch though. Overwintering leafhopper eggs have likely started to hatch in all areas. Local leafhopper adults will likely start emerging in the Windsor area in about 7-10 days. No leafhoppers have been reported in the Holland Marsh.

Onion thrips have been seen on transplanted onions. Be sure to scout for thrips.

Data provided by Environment Canada.

*Data provided by Muck Crops Research Station, University of Guelph.

Degree day model information for pests