Abstract:

In order to investigate invading and epidemic rules of Sclerotinia sclerotiorum of ‘Zheyou50’, and promoting the development of brassica campestris industry, this paper studies the outbreak regularity of and epidemic model of Sclerotinia sclerotiorum according to field investigation and infection. The result showed that machinery direct seeding rape was good for the occurance of Sclerotinia sclerotiorum for the reason of late seeding and high density. The period from water damage disease spots to wilting die back was about 15 days only. The latent period from nature mycelium to invade to total was about 8-17 days. The infect rate was about 13.2%. The epidemic dynamic showed to be linear and spreading. The flowering stage was the main epidemic period of Sclerotinia sclerotiorum. Spreading of Sclerotinia sclerotiorum showed to be the Logistic model.