Management of White Stem Rot (Sclerotinia sclerotiorum) of Mustard with Organic Soil Amendments

摘要

Soil amended with leaves for white stem rot management of mustard revealed that Bougainvillea leaves were the most effective and produce total seedlings mortality (4.8%) followed by aonla leaves (6.9%) as compared to control (46.9 per cent). Bougainvillea leaves amendment was better in reducing damping-off as compared to seed treatment with carbendazim (7.6%). Similarly, the number of apothecia, lesion length and disease intensity recorded were lesser in Bougainvillea and Lowsonia inermis leaves amended pots. Pots amended with Bougainvillea, Eucalyptus and Syzygium cuminii leaves were better treatments and contracted disease incidence 36.7, 36.7, and 40.0%, respectively, as compared to inoculated control (100%). Similarly, soil amended with mustard cake, sesamum cake, S. cuminii seed powder and of cotton cake was potent in reducing total seedling mortality (4.1, 4.8, 7.6 and 8.9%, respectively) as compared to inoculated control (46.9%). The soil amendment with cakes was even better than seed treatment with carbendazim, except cotton cake. All cakes or organic manures were significantly different and reduced number of apothecia production. Poultry manure was the most effective and significantly better in reducing lesion length (1.5 cm) as compared to others treatments. Likewise, poultry manure, neem seed powder and cotton cake were the best treatments and had disease intensity of 29.9, 30.0 and 31.7%, respectively. Poultry manure and neem seed powder were found superior in reducing disease incidence to 16.7 and 20.0%, respectively as compared to inoculated control (100%). These treatments were at par with carbendazim seed treatment. The regression equation developed revealed a positive and perfect correlation (R-2 = 1) between number of apothecia formation and disease intensity.