In recent days, temperatures have fallen and some growers have reported that due to climate change, recent strawberry diseases have occurred from time to time. According to field investigations, mainly gray mold and powdery mildew, these two diseases are common and most harmful diseases in strawberry production. Seedlings often become part or dead seedlings after they have become infected. If they are not treated in time, they often reduce the production of strawberries by 20% to 30% and severely reduce production by 50%.
Gray mold damage leaves, petioles, petals, calyces, fruits and fruit stems. In the early stages of the onset of leaves and stems, the diseased department developed brown or dark brown oily lesions. In severe cases, the affected parts rotted and the diseased part appeared white flocculent mycelium. The incidence of fruit is mostly near maturity. After the onset of disease, the fruit becomes soft. There are obvious symptoms of grease-like poisoning around the lesion. The surface of the diseased part is dense with gray moldy layer. When the humidity is high, white flocculent mycelium is present.
The symptoms of powdery mildew are white powdery substances on the leaves, petioles, fruit stems and fruits. When severe, the leaves curl upwards and the leaf margins atrophy and dry coke. After flower buds are infected, they are difficult to open and their petals turn red. The young fruit is hindered from developing after being affected and gradually dries.
The common points of these two diseases are that they are all fungal diseases. They all overwinter on the remnants of the diseased plants. Second, they are all confined to planting. Third, the temperature is in the range of 12°C to 25°C under high humidity conditions. Are susceptible to disease. In view of the ecological characteristics of strawberry gray mold and powdery mildew, precautions must be taken in terms of agricultural measures and chemical control.
Agricultural control: First, the rotation of crops should be conducted in paddy and dry land. Continuous planting should not exceed two years. The second is to improve the facilities of the water system so that the energy can be drained and filtered, and the roots of the strawberries can be promoted well. Third, the scientific formula fertilizer should be applied. The fourth is to plant plants in a proper way to prevent shading; the fifth is to completely remove and destroy diseased plants.
Chemical control: For gray mold, one can use 10% of the appropriate music when 10 ml, against the water 20 kg; two can be used 3% of oxygen clear 600 to 800 times the liquid; three can be used 50% speed Keling 800 times the liquid; four available 70 % Thiophanate-methyl 800 times; 55% 75% chlorothalonil wettable powder 600-800 times. More than a few fungicides, depending on the disease every 7 to 10 days to kill a shot. For powdery mildew, an available K crop bactericidal repair solution, 20 ml per mu water 50 kg; 2 available 3% oxygen clearance 600 to 800 times the liquid; 3 available 25% triadimefon WP 3000 to 4000 times; four 70% thiophanate-methyl 1000 times can be used; 50% 30% Teflon 5000 times can be used.
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