1. Pests The scorpion moths are an important pest of Astragalus. The larvae are used as a thin silk nest on the back of the leaf, and the worms feed on the mesophyll in the silk nest, leaving only the epidermis to survive the winter on the residual leaves. Control method: clear garden, dealing with residual plants such as litter. The occurrence period is sprayed with 90% trichlorfon 800 times solution or 40% dimethoate 1000 times solution. Once every 7 to 10 days, spray 2 to 3 times in a row to control the damage of the insects.
2. Diseases (1) The pathogen of leaf blight is a semi-know fungus in fungi. It is a harmful leaf that extends from the tip of the leaf or the edge of the leaf into an irregular dark brown lesion, which spreads rapidly from the bottom to the top, and finally the leaves die. In the hot and rainy season, the incidence is heavy, and it is initially caused by spotting. If it is not timely, it can spread to the whole field.
Control method: Treat the sick plants in winter and eliminate the source of overwintering bacteria. In the early stage of the disease, 50% carbendazim WP 1000 times solution or 1:120 Bordeaux solution is sprayed once every 7 to 10 days for 2 to 3 times.
(2) Powdery mildew Powdery mildew is mainly infesting leaves. The white spots on both sides of the leaves are like a layer of white powder. The lesions converge and fill the entire leaves. Finally, the black spots on the lesions are scattered. It is easy to develop when the humidity is high in the field. Control methods: strengthen field management, pay attention to ventilation and light transmission in the field, prevent premature aging and so on. Spray with 50% of dexamethasone 1000 times solution or 0.1% to 0.2% of wettable sulphur powder.
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