Q: What kind of death is caused by the death of my kind of spring mulberry film? How can we prevent it?

Answer: There are two main causes of the death of spring lettuce. One is the sclerotinia sclerotiorum disease, and the other is the damage of underground pests. The vegetable farmer should treat the disease according to the specific conditions of the lettuce disease. Sclerotia sclerotiorum mainly occurs in the middle and late stages, but due to suitable conditions, the incidence of this year is earlier, especially the incidence of spring mulching film mulching, Dingzhou City is also common, and some diseased strains up to 20%. The disease mainly harms the rhizomes. After infection, the outer leaves gradually regressed and turned yellow and eventually died of wilting. Most of the diseased areas were immersed in water-like soft rot. The surface of the diseased lesions produced a thick layer of white mold, which eventually formed the black rat fecal nucleus. When the conditions are appropriate, the plants are often killed and lying on the ground. The Sclerotinia sclerotiorum dies in the form of sclerotia in the soil and in the roots and leaves. Germs like a warm, moist environment with a suitable onset temperature of 5 to 24°C.

Prevention measures: selection of disease-resistant varieties. Reasonably apply nitrogen fertilizer, increase phosphorus and potassium fertilizer and biological bacteria fertilizer. Reasonably watered. After the harvest, clean the pastoral area. Planted from disease-free plants. At the beginning of onset, use 40% sclerotium net 1000 times, 50% acetaminophen 1000 times, 50% procymidone 1500 times, 43% tebuconazole 4000 times, spray once every 7 days, even spray 3 to 4 Times.

The underground pests that endanger lettuce this year are mainly golden needles, especially the use of unfermented organic fertilizer in the base fertilizer, and the incidence is heavier. Symptoms are that the plants are wilting but the yellowing is not obvious. After the roots are pulled out, the roots turn brown and rot, and there are traces of worms. 48% chlorpyrifos 1000 times, 50% phoxim 1000 times can be used to root.

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