From this single stalk, flowering branches originate exhibiting an indeterminate growth habit. The plants generally begin to develop yellow flowers in early April and continue to grow, bloom and set seed for five to six weeks. Pod set occurs from approximately 18 inches above the crown to the top of the plant, generally 55 to 60 inches tall. Harvest will occur during late June and early July, similar to that of winter wheat. Several insect pests have been observed to attack rapeseed, including the cabbage seedpod weevil, aphid, and harlequin bug.
Sclerotinia is most prevalent where warm, wet conditions occur.
Expect increased incidence of Sclerotinia when other susceptible Crops are grown in rotation with rapeseed including irrigated sunflower, dry beans or vegetables. Sclerotinia under dryland conditions should not be a problem. The incidence of Pythium is most prevalent when rapeseed is planted late. The disease has not been a problem so far in Colorado. Irrigation Irrigation methods including center-pivot, lateral move and furrow can be used effectively for the successful production of rapeseed.