The Three Pests and Diseases Control of Scrophulariae
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(2) The pathogen of blight is a fungus (Sclerotium rolfsii Sacc.) in fungi. Harm the roots and rhizomes. South is easy to get the disease. From June to September in Jiangsu, there was severe rain. The roots were rotted, and the roots and rhizosphere soils were covered with white silky hyphae, and yellowish to brownish brown rapeseed sclerotia. Mycelium and small sclerotia can spread to the main stem. The diseased plants quickly wilted and died. Control methods: 1 Rotary crops with cereal crops, avoid continuous cropping. 2 Strengthen field management, pay attention to drainage and ventilation. Rainy areas should be planted with oysters. 3 timely removal of diseased plants, removal of diseased soil, and lime to close the disease. 4 Before planting, use 50% tumefacillus 1000 times liquid vacuole for 5 minutes to dry and plant.
(3) Red spider damages the leaves, causing white spots, yellow leaves, and dryness.
In addition, there are also hazards of tigers and locusts. Prevention and control methods, artificial capture of ground tigers or baiting, and locust damage can be controlled with dimethoate or tobacco gray water.