ONvegetables publishes monthly crop reports for commercial vegetable producers in Ontario, Canada. Spider mites were confirmed on cucurbits in the July 29, 2021 crop report. View the report to view images of mites and symptoms of Phytophthora crown rot . Wet conditions have been conducive to the development of Phytophthora crown rot
ONvegetables
ONvegetables VCR | July 15, 2021
Cucurbit downy mildew has been confirmed on cucumber at one location in Norfolk County and two additional locations in Kent County. Squash bugs are active on pumpkins and squash.
Downy mildew identified in Ontario cucumbers
Plants in most areas are still very small and many grower will not have started their preventative fungicide programs. Now that the disease has been confirmed in Ontario, fungicides should be applied as soon as possible.
ONvegetables VCR | Sept. 10, 2020
ONvegetables reports that wet soil conditions are conducive to infection by Oomycetes such as Phytophthora which can lead to extensive damage in the field, and can lead to storage rots. Workers harvesting pumpkins and squash with Phytophthora infections should sanitize their hands after handling infected fruits before handling uninfected fruit. Management of Phytophthora infestation in cucurbit fields requires a long (4-5 year) rotation.”
Ontario Vegetable Crop Reports for Sept. 3, 2020
Symptoms of Gummy Stem Blight in winter squash include hot spots of stems with oozing lesions, and distinctive patterns on the skin of butternut squash.
Ontario Vegetable crop reports for August 6, 2020
“Downy mildew pressure remains high, and has now been confirmed on cucumbers as far North as Wellington county. Early detection of downy mildew this year increases the possibility of fungicide resistance.”
Ontario Vegetable crop reports for July 30th, 2020
“Examine low lying or poorly drained areas noting any wilted or stunted plants, and look for lesions. Phytophthora usually presents as a foliar blight or a crown rot in zucchini, squash, and pumpkin, so look for dark lesions on the crown. In cucumbers and melons Phytophthora usually causes fruit and stem lesions so look for water soaked lesions with white spores developing on the fruit.”
Ontario Vegetable Crop Report for July 23rd, 2020
“Downy mildew continues to circulate in many parts of Southwestern Ontario, and in American states around the Great Lakes.”
