In the near future, there are often telephone consultations by readers: What are the reasons for the chlorotic chlorosis of wheat seedlings and the appearance of chlorotic leaves in some leaves?
After field investigation, the author found that there are three reasons: First, poor quality chemical fertilizers caused burning roots, coupled with the sudden formation of hot weather. The second is that the sheath blight and underground pest control are not in place. The third reason is that the root rot of wheat is harmed by Helminthiasis. This is the main reason.
The root rot exfoliation syndrome is a typical multi-stage disease in the whole wheat growth period. In the adult stage, leaf early drying, ear rot, root rot, stem rot, leaf spot, black embryo, grain pods, etc. were induced, among which leaf spot was the most common. Yellowing of the tip, a piece of light green to yellow patches appeared in the field, and the diseased seedlings were short, sparse and upright. The tip of the lower 1-2 leaves are coked 1-2 cm, with poor root development, few secondary roots, brown spots on the surface of the seed's roots and stem base, deep inside, diseased parts rot, severe secondary root tip or middle part also Browning rot, childbirth withered, or partial or complete death of the whole plant in the middle to late reproductive period. The leaves produce a typical light brown, elliptical to spindle lesion, with yellow halos around them and yellowish lesions in the middle. One of the reasons for the frequent occurrence of the disease this year is that the white seeds are planted under the ground and there is no coating, and second, the fertilization is unreasonable.
Control methods: wheat white seeds are strictly prohibited, and 20 ml of medamine or 10 ml of light shield can be used for coating per mu. Increase organic fertilizer, biological bacterial fertilizer and trace elements. In the early stage of wheat disease, spraying with mancozeb 600 times solution (or myclobutanil 1000 times or thiophanate-methyl 600 times solution) + 15 milliliters of chlorophyll + 40 grams of phosphorus and potassium power per acre, continuous 2- 3 times, 5-7 days apart.
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