The Fish that loves to bathe on WeChat on September 21: I am from Lianyungang. What is the cause of the blackening of the leaves of strawberry seedlings? After viewing, the whole plant of the strawberry seedlings in the center of the picture is nearly dark brown, dull, and the leaves are close to the petiole. The color is deeper and the outer leaf edge color is relatively better. The whole plant leaves are generally shrunk and partially damaged. In the upper right corner of the picture, the plants with normal color can be seen, but the color of the leaf near the petiole is dark. . Researcher Ji Muxiang, a researcher on strawberry pests and diseases at Zhenjiang Agricultural Research Institute in the hilly area of ​​Jiangsu Province, said that after viewing the picture, strawberry seedlings may be harmed by thrips. It is recommended that farmers go to the overlap of strawberry heart leaves to see if there are worms, and the worms are very Small (body length is only 0.5 ~ 2 mm), you must be careful when viewing. From the picture, the damaged leaves showed late symptoms, indicating that the hazard of the thrips has been very heavy, and it is necessary to use drugs in time and combine with hanging suede swatches to prevent and control. Initial symptoms of leaves damaged by thrips According to Ji Muxiang, Hummer is one of the important pests that endangered strawberries in recent years. Because its worms are small and harmful, it is difficult to be discovered in the early stage, and it is often taken seriously when it is seriously harmful, but it is too late. In the process of strawberry production in Jiangsu Province, there are two peaks in the damage of thrips. In recent years, due to strawberry variety renewal and technical improvement, strawberry flower bud differentiation in winter greenhouses is advanced, and the number of thrips has rebounded in late November. If the control is not timely, the damage to the stamens will be great, which will affect the first strawberry fruits in winter. In addition, some thrips are the vector of the virus and cause viral diseases. Hanging the sticky swatches in the strawberry field is an effective measure to prevent and control the thrips. From strawberry planting to harvesting, it also has an effect on aphids. The swatches are generally 30 cm long and 20 cm wide, with 30 to 40 pieces per acre, and yellow, blue, etc. are cross-distributed. The swatch should be hung 20 to 40 cm from the top of the strawberry plant. When the pests are severe, increase the number of swatches. When the number of pests adhering to the swatches is large, the new swatches should be replaced or re-applied. In addition, it is necessary to remove the weeds and dead branches in the field in time, and burn them or bury them in depth to eliminate some adult and nymphs. At the same time, strengthen the management of fertilizer and water, and promote the robust growth of plants. The insect net is blocked in the field, and it has certain control effect on the thrips. In view of the strong concealment of Hummer, the pesticide should be selected to have a systemic drug or a silicone additive, and try to choose a long-lasting drug before seedling and flowering. It is recommended to use bio-pesticide, such as 1500-2000 times solution of 60 g/L ethyl spinosyn suspension, or 4000-6000 times liquid of 40% flubens-ethyl polyhydric water dispersing agent, or 1.3% matrine water. Spray 1500 times liquid and other spray control. It can also be controlled with low-toxic chemical pesticides, such as 50% flufenidamide water-dispersible granules 5000 times solution, or 240 g / liter of spirotetral ethyl ester suspension agent 4000-5000 times solution, or 10% flonica amide water Disperse granules 1500 times solution, or 25% thiamethoxam water-dispersible granules 5000-8000 times solution and other sprays, various drugs should be used interchangeably. The cockroach adult can fly and jump, and the diffusion speed is fast. When the medicine is used, it starts from the periphery and then goes to the middle to facilitate the elimination. At the same time, according to the characteristics of the hustle and bustle of the horse, choose the afternoon medication. After the greenhouse is covered with sheds, it can be fumigation and control. It uses 250% to 300 grams of 10% isoprocarbant per acre, and is distributed in 8 to 12 places. It is ignited in the evening and fumigation overnight. After placing the bee, you should pay attention to protect the bees and move out of the greenhouse for more than 3 days. (Source: Jiangsu Agricultural Science and Technology News) This article URL: Is the black leaf of strawberry seedlings a symptom of thrips? How to effectively prevent Squid,Frozen Squid,Frozen Calamari,Frozen Squid Roe ZHEJIANG EVERNEW SEAFOOD CO.,LTD , https://www.evernewseafood.com