Strawberry powdery mildew may occur from the seedling stage to the fruiting stage of strawberry. It will harm strawberry leaves, flowers and fruits. The outbreak occurs very quickly, and it only takes 20 to 24 hours from germination to infection. When the disease is severe, it will cause the leaves to curl upward and deform; when the flowers are infected, the flowers will not develop normally; when the young strawberry fruits are infected, the diseased parts will turn red and cannot expand normally; during the fruit picking period, the storage period will be shortened, seriously affecting the strawberry production. quality and lose commodity value.
Recently, many farmers who visited strawberry greenhouse bases in Zhejiang and other places reported that many pesticides used in the past (such as fluopyram, trifloxystrobin, pyrimethol, tristrostrobin, etc.) were not effective in controlling powdery mildew. Things were getting better in the past two years, but the number of sprays has increased, the concentration has continued to increase, the cost has increased, and the strawberries grown are not as good as before, which has seriously affected the yield and income of local farmers. The reason is that strawberry powdery mildew has become increasingly resistant to chemical agents.
Based on the above situation, we recommend that all fruit farmers change their thinking and switch from passive prevention to active prevention, that is, giving priority to prevention and combining prevention and control.
Strawberry powdery mildew prevention and control strategy - "Prevention first, combined with prevention and control"
First of all, according to the climate, determine the occurrence of the disease and prevent it in advance, and use the plant-derived pesticide 0.4 osthole 400 times, protect crops in advance and reduce damage to fruits caused by diseases and unnecessary economic losses.
Secondly, for sensitive periods of crops such as the young fruit stage, the plant-derived pesticide 0.4 osthole 200 times should be used for preventive treatment in the early stages of disease occurrence.
Finally, if powdery mildew has completely broken out in the greenhouse, it is recommended to use 0.4 osthole 200 times and 25 ether phenol sulfonate 750 times for rapid powder removal treatment, and rotate the use of chemical pesticides during prevention and treatment. Prevent the rapid development of chemical pesticide resistance.
Qingshuang: 0.4 osthole soluble agent, the active ingredient is derived from the natural Chinese medicinal material Cnidoma monnieri. It adopts the first patented extraction process technology and adds a variety of synergistic additives. It is non-drug resistant and non-toxic. Residual and safe for crops, it can effectively remove powdery mildew. At the same time, use it 2-3 times continuously. The strawberry leaves and fruits are shiny and of high quality.
Case 1: On December 4, 2020, in Xiaya Town, Jiande City, Zhejiang Province, strawberry powdery mildew began to infect the leaves. After 200 times of 0.4 osthole doses, all the white powder fell off in 3 days, and there was no trace after 6 days. relapse. Effectively removes powdery mildew; it is natural and can promote crop health. After use, the leaves will be oily and thick green.
Case 2: On December 4, 2020, Xiaya Town, Jiande City, Zhejiang Province, 25-pyrimethol sulfonate was treated with 750 times and 0.4 osthole 400 times, and powdery mildew lesions were found 6 days after treatment. It dried up and did not rebound for 15 days.
Case 3: On December 13, 2019, powdery mildew broke out in Hu Da Ge’s strawberry shed in Changfeng County, Hefei, Anhui Province. 0.4 osthole was used to prevent and control it 200 times, and the powdery mildew was controlled after 2 days; 50 oxystrobin (CK) Dealing with powdery mildew exacerbations. Brother Hu is very satisfied with the effect of osthole in preventing and treating powdery mildew.
Case 4: Use 250 times the amount of water during the mature stage of strawberries, which can effectively prevent diseases such as powdery mildew and extend the storage period; strawberries treated with clear water and acetostrobin were infected with powdery mildew and began to rot.
Farmers are reminded that strawberry powdery mildew is common, easy to spread, highly resistant to pesticides, and difficult to control. Please change the prevention concept to "prevention first, combined with prevention and control."