As temperatures warm up, flea beetles are emerging and on the move. Feeding damage is evident in early emerged canola. Peak emergence from overwintering sites occurs once soil temperatures reaches 150 C (60 0 F). Depending on temperatures, flea beetles can take up to 3 weeks for all adults to emerge. Adults emerge overwinter in […]
By Brian Hall, OMAF/MRA, Stratford For many growers, this year’s canola crop will be a challenge to harvest as a result of large differences in crop stage, because of thin and weedy stands, or fields that were damaged by swede midge. When managing these fields, harvest management either by swathing or direct harvest becomes critical […]
by Brian Hall The summer emergence of flea beetles is upon us. In July larvae emerge from the soil and begin to feed on canola pods and leaves. Feeding during pod development can cause premature pod ripening, shrivelled seeds, pod shatter and allow fungal growth during wet weather. In most cases, although the damage can […]
Once canola starts to emerge, start scouting for flea beetles. Flea beetles are now very active and present in emerged canola. Canola will emerge quickly with forecast temperatures in high teens for the next week. Flea beetle damage is most severe the first two weeks after canola after canola seedling emergence. At the 3-4 leaf stage […]
Canola seedlings can with stand a considerable frost (-5 to -8 0 C) if plants have become acclimatized following a few days of cold temperatures. However, canola seedlings growing under warm conditions will be tender, and can be killed by even a few degrees below zero. Ice crystals will form on the leaf surface before […]
There has been a great deal of debate about the need for boron on spring canola. It is well documented that boron plays a critical role in proper canola pollination and seed set. This has created quite a bit of interest from growers who have been experimenting with foliar boron applications at early-flowering. Also driving […]