Water Purifier,Water Purifier System,Household Water Purifier,Commercial Water Purifiers Jinan Mucho Commercial Inc. , https://www.muchovet.com
Shedding strawberries in the greenhouse: Pay attention to prevention and control of gray mold and powdery mildew
Recently, some farmers adopting plastic film-covered cultivation of strawberries reflect that strawberries have gradually entered the flowering stage, and although the growth and development are good, the diseases occur frequently. According to field investigations, it was mainly gray mold and powdery mildew. After being harmed by these two diseases, strawberries often die locally or in slices. The lighter ones cut production by 20% to 30%, and the severer ones cut 50%. When gray mold occurred in strawberry, brown lesions appeared on the leaves and fruits, which were water-stained. In severe cases, the diseased part festered. At the same time, petiole, petals, flower buds, and fruit stems were also endangered. Under conditions of high humidity, the surface of the diseased area was covered with a gray moldy layer and a flocculent white hyphae was initiated. When powdery mildew occurred in strawberry, white powder appeared on the leaves, petioles, stems, and fruits. When severe, the leaves curled upwards, and the leaf margins were atrophic and dry. After flower buds are infected, they are difficult to open and the petals turn red. The young fruit is hindered from developing after being affected, and it gradually dries. These two diseases have three things in common: First, they are all fungal diseases, they both overwinter on the residue of the diseased plants; Second, they avoid the continuous cropping of strawberries; The third is in the temperature range of 12 ~ 20 °C, in high humidity conditions Are easy to disease. When it comes to prevention and control, comprehensive prevention and control should be carried out in light of the characteristics of agriculture and chemical control. For agricultural control, one should use crop rotation instead of continuous cropping; Second, improve water system facilities, so that energy can be drained and filtered, and promote good rooting and robustness of strawberries; Third, apply scientific fertilizer and avoid partial nitrogen fertilizer; To prevent shading; Fifth, to timely and thoroughly remove and destroy the diseased plants. In the case of chemical control, for gray mold, 50% SulfoMax may be used 800 times, or 70% thiophanate-methyl 800 times; 50% Carbendazim 500 times; 75% chlorothalonil wettable powder 600-800 Double liquid prevention. The above fungicides were sprayed and killed once every 7-10 days. For powdery mildew, 25% triadimefon WP can be used 3000 to 5000 times, or 70% thiophanate-methyl 1000 times; 50% tetrotide 800 times; 30% TSF 5000 times. Note that different pesticides are alternately used on a regular basis to prevent germs from developing resistance.