Tag: scouting
Swede midge is often mistaken for bacterial rot in Brassicas
Swede midge (SM; Contarinia nasturtil) is an invasive, gall-forming dipteran pest that was first identified in Canada on an OntarioContinue Reading
New Allium Pest of Concern – Allium leaf miner
Allium leaf miner (Phytomyza gymnostoma) an invasive pest of European origin, has recently been identified in several US states including
Tracking the march of leek moth in Ontario
Leek moth (Acrolepiopsis assectella) is an invasive pest of European and Asian origin. The first North American detection occurred nearContinue Reading
Downy mildew of brassica vegetables
Downy mildew of brassicas (Hyaloperonospora parasitica syn. Peronospora parasitica) is a fungal-like oomycete that can be devastating in cooler, wetContinue Reading
Update on the Clubroot of Brassica Survey
We are currently conducting a clubroot survey for Brassica vegetables in Southwestern Ontario. To date we have identified or collectedContinue Reading
Scouting for onion thrips
Onion thrips (Thrips tabaci) feed on more than just onions; they also feed on cabbage, leaf lettuce, a variety ofContinue Reading
Stemphylium is the new Botrytis
Stemphylium leaf blight (Stemphylium vesicarium) of onion starts as yellow-tan, water-soaked lesions developing into elongated spots. As these spots coverContinue Reading
Downy Mildew Report for the week of June 12, 2017
By Cheryl Trueman, University of Guelph – Ridgetown Campus Scouting for downy mildew in pickling cucumber fields in Norfolk CountyContinue Reading
Cabbage Maggot; An old pest with limited options
The cabbage maggot (Delia radicum) is the larvae stage of the cabbage root fly which can cause severe damage toContinue Reading