Recently, the temperature has dropped, and some farmers have reported that due to climate change, strawberry diseases have occurred recently. According to field investigations, mainly gray mold and powdery mildew, these two diseases are the most common and most harmful diseases in strawberry production. After the seedlings are susceptible to disease, they will often be partially or in a piece of dead seedlings. If not prevented in time, the strawberry will be reduced by 20% to 30%, and the yield will be reduced by 50%.
Botrytis cinerea damages leaves, petioles, petals, calyx, fruits and fruit stalks. At the beginning of the onset of leaves and stems, the diseased part produces brown or dark brown oily lesions. In severe cases, the affected part rots, and white flocculent hyphae appear in the diseased part. When the fruit is mostly close to maturity, the fruit becomes soft after the onset, and there are obvious oil-like poisoning symptoms around the lesion. The surface of the diseased part is densely grayy mildew, and when the humidity is high, there are white flocculent hyphae.
The symptoms of powdery mildew are white powder on the leaves, petioles, fruit stems, and fruits. In severe cases, the leaves curl upward and the leaves are atrophied and scorched. After the flower buds are soaked, it is difficult to open and the petals turn red. After the young fruit is damaged, the development is blocked and gradually dried up.
The commonality of these two diseases is that they are both fungal diseases, all over the winter of the diseased plant residues; the second is to avoid continuous cropping; the third is the temperature in the range of 12 ° C ~ 25 ° C, under high humidity conditions Both are prone to disease. In view of the ecological characteristics of strawberry gray mold and powdery mildew, it is necessary to start prevention and control from both agricultural measures and chemical control.
Agricultural control: First, the water and drought rotation, continuous planting can not exceed two years; the second is to improve the water system facilities, so that irrigation can filter energy, promote strawberry hair roots; third, scientific formula fertilization, avoid partial application of nitrogen fertilizer; The fourth is to rationally close the plant to prevent shading; the fifth is to completely remove and destroy the diseased plants.
Chemical control: For gray mold, 10 ml of 10% good music can be used, 20 kg of water can be exchanged; 2 can be used for 600-800 times of 3% polyoxygen; 3 times of 50% quick-drying 800 times; % methyl thiophanate 800 times solution; five available 75% chlorothalonil WP 600-800 times solution. The above bactericides are sprayed once every 7 to 10 days depending on the condition. For powdery mildew, one can use K-crop bactericidal repair liquid, 20 ml per acre with 50 kg of water; two can use 3% polyoxygen 600-800 times liquid; three can use 25% powder rust WP 3,000-4000 times liquid; 70% methyl thiophanate 1000 times solution can be used; five can use 30% fulofol 5000 times solution.
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