Spinach downy mildew is common and serious. The disease only harms spinach.
First, the symptoms of performance Spinach downy mildew mainly harms the leaves. The leaves are damaged and begin to produce small spots of pale yellow irregularities. When enlarged, the lesions are connected to each other. In severe cases, the leaves are yellow and the leaves are rotted when wet. The gray-purple mold layer on the back of the diseased leaves, namely sporangia and spores Cyst stem.
Second, the incidence of the disease pathogens in the autumn sowing on the spinach or wintering spinach plants with oospores overwinter in the diseased leaves, becoming the first source of dip in the leap year. Under suitable conditions, sporangia are produced, which are spread by airflow, produce germ tubes, invade from the stomata and epidermis of the leaves, and then produce sporangia in the diseased part for re-dip. Under low temperature and high humidity conditions, the incidence is generally heavy.
Third, prevention and treatment methods (A) agricultural control. Heavy illness fields should be rotated for 2 to 3 years. Apply the fermented organic fertilizer to improve the disease resistance of the plant. Reasonable close planting, scientific watering, prevent flooding of large water, strengthen air release, and reduce humidity. Clean the pastoral area, find the diseased leaves or shrinking plants, and remove them in time. At the time of harvest, the fallen leaves are completely removed and taken to the field for deep burial or burning. (2) Chemical control. In the early stage of the disease, it can spray 90% of the WP WP 500 times, or 70% of the Mn WP 400 times, or 72% of the Phytotoxic WP 500 times, or 72% of the gram. 600-800 times solution of wettable powder, or 600-800 times solution of 72% anti-wet powder, or 1500 times of 50% Anke wettable powder, or 58% of nail-cream manganese-zinc wettable powder 500 times liquid, or 72.2% of the propofol (Plucker) water agent 600 ~ 800 times liquid, spray once every 7 days, even spray 2 to 3 times. Pesticides should be applied alternately to prevent drug resistance.
First, the symptoms of performance Spinach downy mildew mainly harms the leaves. The leaves are damaged and begin to produce small spots of pale yellow irregularities. When enlarged, the lesions are connected to each other. In severe cases, the leaves are yellow and the leaves are rotted when wet. The gray-purple mold layer on the back of the diseased leaves, namely sporangia and spores Cyst stem.
Second, the incidence of the disease pathogens in the autumn sowing on the spinach or wintering spinach plants with oospores overwinter in the diseased leaves, becoming the first source of dip in the leap year. Under suitable conditions, sporangia are produced, which are spread by airflow, produce germ tubes, invade from the stomata and epidermis of the leaves, and then produce sporangia in the diseased part for re-dip. Under low temperature and high humidity conditions, the incidence is generally heavy.
Third, prevention and treatment methods (A) agricultural control. Heavy illness fields should be rotated for 2 to 3 years. Apply the fermented organic fertilizer to improve the disease resistance of the plant. Reasonable close planting, scientific watering, prevent flooding of large water, strengthen air release, and reduce humidity. Clean the pastoral area, find the diseased leaves or shrinking plants, and remove them in time. At the time of harvest, the fallen leaves are completely removed and taken to the field for deep burial or burning. (2) Chemical control. In the early stage of the disease, it can spray 90% of the WP WP 500 times, or 70% of the Mn WP 400 times, or 72% of the Phytotoxic WP 500 times, or 72% of the gram. 600-800 times solution of wettable powder, or 600-800 times solution of 72% anti-wet powder, or 1500 times of 50% Anke wettable powder, or 58% of nail-cream manganese-zinc wettable powder 500 times liquid, or 72.2% of the propofol (Plucker) water agent 600 ~ 800 times liquid, spray once every 7 days, even spray 2 to 3 times. Pesticides should be applied alternately to prevent drug resistance.
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