Strawberries are covered with plastic film in greenhouses. The greenhouses are hot and humid, creating even more favorable conditions for diseases and insect pests. Common pests and control measures of grass weeds are introduced as follows:
First, common diseases
1, leaf spot. The main damage leaves, the typical symptoms of lesions centered on a gray or gray-brown round spot, surrounded by purple brown, like snake eyes. The disease is prone to occur when it is warm and humid, and the old leaves first develop disease and gradually extend to the whole plant. The incidence of light before the flowering results, began mining? After the close of a lot of happenings.
2, powdery mildew. The whole plant of the disease is prone to occur. When the leaves are damaged, dark stains occur and the sizes are not equal. Then a white powder is produced on the dorsal plaque, and a reddish-brown lesion is seen later, and the leaf margins are atrophic and dry. Early fruit damage, that is, stop development, dry, if the later victims, the surface produces a layer of white powder. It can occur continuously throughout the growing season and is extremely hazardous.
3, gray mold. The main diseases that occur after flowering, the bacteria first invade the small fruit, the fruit surface in contact with the soil surface first, then the fruit? The stems spread to the peduncle and die dry. In the case of infringing on the fruit that has been transformed, a water brownish-brown patch appears dark brown and a layer of gray mold appears on the surface, causing the fruit to soften. Gray mold blows away with the wind and spreads to other fruits to cause illness.
4, root rot. From the lower leaves, the leaf margins turn reddish-brown and gradually wither upwards until dead and the roots begin in the middle? Become dark brown and corrupt, the center pillar of the root is red.
5. Yellow Blight. Also known as bacterial blight, the stems and leaves shrink during the day and recover in the evening, withering and dying after 2-3 days. Squeezing the diseased stems by hand, turbid white mucus flows out. The pathogens mainly survive with the diseased plants in the soil for winter, and can survive for several years. When the conditions are appropriate, they invade from the wounds of the roots or stems, and the continuous cropping of strawberries or rapeseeds are often continued. Serious illness, even causing a large number of deaths? Absolutely.
Second, the main control measures
1, based on comprehensive prevention. Strengthen field management, nurture strong seedlings, implement 2-3 year crop rotation, transplant with eyes and soil, avoid root damage stems, timely cover membranes, scaffolding, ground management, timely removal of diseased fruits, dead old leaves, and removal of diseased plants Deeply buried or burned? Keep the strawberry garden clean and ventilate, and pay attention to ventilation and ventilation in the shed to reduce the hazard of humidity and exhaust gas.
2, soil disinfection before planting. Before transplanting strawberries, use 40% asparagus green powder 600 times liquid, pour in the lotus root, and then reconstitute the soil and transfer the whole plant to effectively kill pathogens in the soil, reduce the number of bacteria in the field, and reduce the chance of infection.
3, regular spraying control. In the growing season of strawberry, spray 1 time every 10-15 days, 40% of asparagus blue powder each time, and 500 times of agricultural streptomycin 150ppm mixture spray. If a disease occurs, add rooting once, and spray it once every 4-5 days. Even when sprayed 2-3 times and yellow blight occurs, 250 pmol of streptomycin can be used in agriculture. When the humidity in the greenhouse is too large, spraying should not be used. "A smoked" fumigation, re-smoked 7 times. If powdery mildew occurs, use 20% Triadimefon 1000-2000 times liquid, gray mold? The disease can be sprayed alternately with 50% SulfoMax 1000 times solution and asparagus blue liquid, the effect is better.
Third, common pests and prevention
The main pests of strawberry include aphids, red spiders, and Spodoptera litura larvae. The aphids can be sprayed with 20% buquermine 1000 times solution, red spider can use 2.5% Uranus or 73% Keziite 2000 times solution, and Spodoptera larvae can be sprayed with 5% stilbene 1000 times solution.
Baby Squid,Baby Octopus,Poulp Squid,Squid Tube
GOLD STAR FISHERY ZHOUSHAN CO.,LTD. , https://www.goldstar-aquatic.com