First, leaf spot disease: also known as snake eye disease, mainly damage to leaves, petioles, fruit stems, tender stems and seeds. A dark purple small shift point is formed on the leaf, and after expansion, a nearly round or elliptical lesion is formed, the edge is purple reddish brown, the center is grayish white, and the thin wheel is slightly rounded, so that the whole lesion is a snake-like shape, and no small black particles are formed on the lesion.
Use of the agent: use 70% chlorothalonil wettable powder 500 times to 700 times solution at the beginning of the disease, spray again after 10 days, or use 70% mancozeb wettable powder, 200 grams per 667 square meters for 75 kg of water spray.
Second, powdery mildew: mainly damage leaves, but also infringe on flowers, fruits, fruit stems and petiole. The leaves are rolled into a spoon. The flower buds and petals are purple-red, and they cannot bloom or bloom completely. The fruit does not swell and is elongated and elongated; the young fruit loses its luster and hardens. Strawberries in the near maturity period will lose their commercial value.
Use of the agent: In the center of the disease center and its surroundings, the focus is on spraying Baume 0.3 degree stone sulfur mixture. After harvesting, the whole garden is cut and sprayed with 70% methyl thiophanate 1000 times solution or 50% retort 800 times solution and 30% fulfluent 5000 times solution.
Third, gray mold: it is the main disease after flowering, can occur on flowers, petals, fruits, leaves. On the fruit during the expansion period, brown spots are formed and gradually enlarged, and the gray mold makes the fruits soften, spoiled, and seriously affects the yield.
Use of pharmacy: control from the present bud to the flowering stage, spray with 25% carbendazim WP 300 times solution, 50% captan WP 800 times solution, 50% chlorhexidine 500 times to 700 times solution .
Fourth, root rot: from the lower leaves, the leaf edge turns reddish brown, gradually wilting upwards, and even die. The pillars began to turn dark brown and corrupt in the middle, and the central column of the roots was red.
Use the medicinal agent: Before transplanting the strawberry, use 40% asparagus powder 600 times solution, pour it on the noodles, then cover the soil and transplant it to kill the bacteria in the soil, reduce the number of bacteria in the field and reduce the chance of infection.
5. Verticillium wilt: The disease is a soil disease. The main symptom is the deformity of the young leaves, the leaves turn yellow, and the surface of the leaves is rough. The leaf edge then browns inwardly until it dies.
Use of pharmacy: Strict introduction of disease-free plant cultivation, shortening the renewal period; soil disinfection with chloropicrin 13.5 liters to 20 liters; the affected person must be removed and burned.
Sixth, aphids: It is harmful to strawberries because the absorption of juice causes the growth of the fruit to be blocked, and at the same time, the leaves and fruits are polluted because the aphids discharge the dew. In addition, aphids are also a medium for transmitting viruses.
Use the medicinal agent: remove the old leaves in time, clear the fields, and eliminate the weeds. Before the flowering, spray 50% of the sputum mist 2000 times, spray a total of 1 to 2 times.
Seven, red spider: Red spiders and yellow spiders are the main cause of strawberry damage, especially red spiders are more harmful. When the leaves are damaged in the initial stage, small gray spots appear, and then gradually enlarge, so that the whole leaves are covered with white patterns, yellowing and curling, and the plants are dwarfed and withered, which seriously affects the growth.
Use of the medicinal agent: When the inflorescence is first appeared, it can be sprayed with a 0.3 degree stone sulphur mixture and sprayed again every seven days. Before the fruit picking, use 20% of the low-toxicity to kill the pyrethroid 5000 times liquid ~ 8000 times liquid, spray twice, at intervals of five days. Note that pesticides are banned two weeks before fruit picking.
Use of the agent: use 70% chlorothalonil wettable powder 500 times to 700 times solution at the beginning of the disease, spray again after 10 days, or use 70% mancozeb wettable powder, 200 grams per 667 square meters for 75 kg of water spray.
Second, powdery mildew: mainly damage leaves, but also infringe on flowers, fruits, fruit stems and petiole. The leaves are rolled into a spoon. The flower buds and petals are purple-red, and they cannot bloom or bloom completely. The fruit does not swell and is elongated and elongated; the young fruit loses its luster and hardens. Strawberries in the near maturity period will lose their commercial value.
Use of the agent: In the center of the disease center and its surroundings, the focus is on spraying Baume 0.3 degree stone sulfur mixture. After harvesting, the whole garden is cut and sprayed with 70% methyl thiophanate 1000 times solution or 50% retort 800 times solution and 30% fulfluent 5000 times solution.
Third, gray mold: it is the main disease after flowering, can occur on flowers, petals, fruits, leaves. On the fruit during the expansion period, brown spots are formed and gradually enlarged, and the gray mold makes the fruits soften, spoiled, and seriously affects the yield.
Use of pharmacy: control from the present bud to the flowering stage, spray with 25% carbendazim WP 300 times solution, 50% captan WP 800 times solution, 50% chlorhexidine 500 times to 700 times solution .
Fourth, root rot: from the lower leaves, the leaf edge turns reddish brown, gradually wilting upwards, and even die. The pillars began to turn dark brown and corrupt in the middle, and the central column of the roots was red.
Use the medicinal agent: Before transplanting the strawberry, use 40% asparagus powder 600 times solution, pour it on the noodles, then cover the soil and transplant it to kill the bacteria in the soil, reduce the number of bacteria in the field and reduce the chance of infection.
5. Verticillium wilt: The disease is a soil disease. The main symptom is the deformity of the young leaves, the leaves turn yellow, and the surface of the leaves is rough. The leaf edge then browns inwardly until it dies.
Use of pharmacy: Strict introduction of disease-free plant cultivation, shortening the renewal period; soil disinfection with chloropicrin 13.5 liters to 20 liters; the affected person must be removed and burned.
Sixth, aphids: It is harmful to strawberries because the absorption of juice causes the growth of the fruit to be blocked, and at the same time, the leaves and fruits are polluted because the aphids discharge the dew. In addition, aphids are also a medium for transmitting viruses.
Use the medicinal agent: remove the old leaves in time, clear the fields, and eliminate the weeds. Before the flowering, spray 50% of the sputum mist 2000 times, spray a total of 1 to 2 times.
Seven, red spider: Red spiders and yellow spiders are the main cause of strawberry damage, especially red spiders are more harmful. When the leaves are damaged in the initial stage, small gray spots appear, and then gradually enlarge, so that the whole leaves are covered with white patterns, yellowing and curling, and the plants are dwarfed and withered, which seriously affects the growth.
Use of the medicinal agent: When the inflorescence is first appeared, it can be sprayed with a 0.3 degree stone sulphur mixture and sprayed again every seven days. Before the fruit picking, use 20% of the low-toxicity to kill the pyrethroid 5000 times liquid ~ 8000 times liquid, spray twice, at intervals of five days. Note that pesticides are banned two weeks before fruit picking.
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