Scrophularia three kinds of diseases prevention and treatment

(1) Bacterial blight is also known as "iron leaf" and "blight leaf blight." The pathogen is a deuteromycete in the fungus (Septoria Scrophulariae West.). The rainy season is more serious. North and South are widespread. At the beginning of the disease, purple-brown dots appear on the leaves. The center is slightly sunken and the lesions expand into polygonal, round, or irregular shapes. The large lesions are gray-brown and separated by veins. The edges are surrounded by a wide ring of purplish-brown horns. There are many small black spots on the lesions. Severe leaves die. Control methods: 1 Clear the garden after harvest and eliminate the diseased plants. 2 Strengthen field management, pay attention to drainage and ventilation. 3 Spray 1:1:100 Bordeaux mixture or 65% Zeocin zinc 500 times before and at the onset of disease, once every 7-10 days, several times in succession.

(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.

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[Attention]
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