Root, bulb, leafy and brassica vegetable pest report – 29 May 2013

See below for the degree days accumulated from April 1^st until May 29^th, 2013. These values are provided as guidelines only and provide an estimate of activity and development stages of certain insect pests in the field.  Local environment/climate/conditions, soil type, field history, etc. are likely to influence activity and presence of these pests in the field. 

Thresholds for emergence of first generation onion maggot fly adults have been reached in all areas for which degree days are calculated for. The Muck Crops Research Station indicated peak flight of onion maggot a week ago with counts decreasing early this week (as of 27 May 2013). The Muck Crops Research Station noted today (30 May 2013) that onion maggot flies counts have increased since early this week. First generation cabbage maggot adults have likely emerged in Windsor, London and Ridgetown areas and are likely to emerge over the next few days in Thedford and Delhi areas. For all areas, accumulated degree days indicate emergence of carrot rust fly adults, if resident populations are present. Carrot rust flies have not been caught on traps at the Muck Crops Research Station in the Holland Marsh (as of 30 May 2013). If resident populations are present, carrot weevil have likely started to lay eggs in all areas as indicated by accumulated degree days. 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 (as of 30 May 2013). Overwintering leafhopper eggs have likely started to hatch in all areas.

Data provided by Environment Canada.

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

Degree day model information for pests