Abstract:

To identity resistance to Sclerotinia sclerotiorum of early-maturity rape, screen the leading-products of rape in the regional epidemics, mitigate the harm of the disease and effectively control the yield loss oilseed rape. The 13 early-maturity rape cultivars to Sclerotinia sclerotiorum from a different province were tested from 2010 by 2011 in Longyang District, Yunnan Baoshan Banqiao Town. The results showed that, the 13 tested varieties incidence of disease (sclerotinia) was between 2.37% and 29.99%, the disease index was between 1.5 and 22.75, which had a positive relationship with growth period, the onset of disease aggravated as the growth period was delayed. When the humidity in the field was heavy, and fertilizer-N amounts were too much in maturity stages of all the tested rapeseed varieties, Sclerotinia sclerotiorum would be obviously aggravated and ultimate harvest yield of rape would be reduced remarkably. Sclerotinia sclerotiorum showed from rape growth and the incidence and disease index of this disease modest aggravate in the maturity stage. The power to resist Sclerotinia sclerotiorum of the 13 tested varieties generally could be classified into five groups. In all growth period, S0013, C868, ‘10peng63yu19’ showed the stronger resistant to Sclerotinia sclerotiorum, they could serve as led the production and breeding material in the regional epidemics of rape cultivars to Sclerotinia sclerotiorum.