1. Symptoms of stalk rot: Cotyledons are dark brown in color, dry and rot. They spread to the base of the stem and become yellow-brown, water-soaked lesions. Finally, they turn into dark brown rot. Later in the onset, they begin at the stem base or the main lateral branch. Raw water immersed lesions, dark brown, black brown, wilting and dead on the ground.
Control methods: stalk rot is mainly caused by seed borne pathogens, even for serious disease, early crop disease, so a reasonable rotation should be implemented, seeds should be fully dried before storage, sowing before the broadcast, seed selection, without mildew, Poor seed quality, good seed disinfection, 50% carbendazim seed dressing 0.3% seed dressing.
2. Symptoms of root rot: The base of the stem is immersed in water, yellow-brown, and the plants are relatively short. The leaves dry up from the bottom up, and the main lateral roots turn brown and rot. In the later period, only the main roots of the brown shrinkage are left. Control methods: a reasonable rotation, strict seed selection, drying seeds, seed dressing 0.3% of 50% carbendazim seed dressing, early onset with 50% carbendazim 1000 times the whole field spray.
3, leaf spot (mainly including brown spot, black spot)
Symptoms: The brown spot is round, dark brown, and larger. There is a yellow halo on the outer edge of the lesion and a gray mold in the late stage. The spot is round, dark brown and there are no yellow halos around the lesion. The lesion is smaller than brown spot. Control methods: a reasonable rotation; selection of disease-resistant varieties; high-temperature and rainy July and August is the key period for the control of leaf spot, early onset can be sprayed 50% carbendazim 800 times or 75% chlorothalonil wettable powder 600 times Liquid or 70% mancozeb 800 times, spray once every 15 days, spray 2-3 times.
4, flower rust symptoms:
The bottom leaves first began to occur. The leaves had yellow spots, small shapes, and a very narrow yellow halo around them. After the epidermis was cracked, rust-colored powders were scattered. In severe cases, the leaves were yellow and dry off. Control methods: At the beginning of the disease, 75% chlorothalonil 600 times solution or 25% Fennin 500 times solution field spray.
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