Management of Clubroot (Plasmodiophora brassicae Wor.) on Cabbage using Trichoderma KA and Lime in Natubleng, Buguias, Benguet

Abstract

The study validated the effect of Trichoderma KA as biological control against clubroot on cabbage (Scorpio variety) in seedbed and under field condition. Rates of 10,15 and 30 g and 10, 15 and 20 g of Trichoderma at spore concentrations of 1.4 x 106 were applied in 1 x 10 m2 in seedbed and in field plots, respectively. Lime was applied at 6 t ha-1 in plots where it is needed while flusulfamide at 300 kg/ha served as the check fungicide.Seeds were sown and seedlings were transplanted two weeks after the application of Trichoderma KA. Clubroot severity, incidence, percent clubroot control, fresh top and root weight, oven dry top and root weight and yield were recorded.

In the seedbed, 30 g Trichoderma effected the lowest clubroot severity and incidence and provided a control of 89.50% and was comparable to flusulfamide. Eighty-two days after transplanting in the field, the treatment comparable to the check was 20 g Trichoderma KA plus CaO. Plants receiving this treatment had the highest heaviest roots and tops. At harvest, this treatment also effected the widest polar circumference of 47.91 cm and produced the highest mean marketable yield of 9.5% t ha-1 with 80.8% clubroot control. This treatment is comparable to flusulfamide.