Temperature – Humid and wet conditions in most growing regions earlier this week were conducive for the spread of some plant pathogens. The Durham, Huron, Peterborough, Simcoe, and Sudbury growing regions are still tracking marginally to significantly behind their average degree day accumulation; while the Chatham, Essex, Kemptville, Norfolk and Wellington growing regions have all caught up to their average degree day accumulations.
Rainfall – Precipitation in most areas varied from a quarter inch to more than two inches depending on the growing region in the past week. Norfolk County has already exceeded it’s average rainfall, while Durham, Peterborough, and Wellington are all past the three quarter mark of their average rainfall totals. Remaining growing regions range from under a quarter to the halfway point of their respective rainfall averages.
Brassica Crops –Alternaria can cause head rot in broccoli and cauliflower if spores are able to infect the beads/curds and secondary bacteria can cause rot. Calcium deficiency causing tip burning has been observed in a few fields. Continue to scout for Alternaria, black rot and fusarium wilt.
Carrot – Harvest is underway for some earlier planted fields. The second generation of Carrot Rust Fly is now active in all growing regions with exception to Chatham-Kent, Essex, Kemptville, and Norfolk. Be on the lookout for white mould between row as canopies are not closed. Continue to monitor for aster yellows, as well as leaf blights which will appear on the oldest leaves at the bottom of the canopy.
Celery – Celery leaf curl has been the predominate pathogen observed. Avoid walking through the fields when the humidity is high and the leaves are wet as celery leaf curl spores will stick to clothes and equipment. Scout for aphids, bacterial blights and leaf diseases
Garlic – When choosing a field for the 2019-2020 field season, avoid a field that has been planted in garlic, lee