Bravo and Topas are labeled. Black rot and Alternaria spot has been found in several areas of Ontario. Bacterial spot of cauliflower has also appeared and should be monitored carefully as wet weather continues. Clubroot disease is also present in areas of fields with high clubroot levels. Rhizoctonia wirestem and head rot are also common in many fields.
Diseases continue to increase quickly in Asian crucifer greens also.
In Nappa cabbage bacterial soft rot, Alternaria, black rot and downy mildew are common. Downy mildew has been observed on Brussels sprouts also. Numbers of diamondback moth larvae and imported cabbageworm have not increased this past week in southern Ontario, however increased levels of diamondback larvae are being reported in Eastern Ontario. Careful monitoring, use of thresholds and rotation of pest management methods will help to reduce damage. Do not use the same material twice in a row for diamondback moth control.