“Greenhouse strawberry powdery mildew mainly occurs after the shed, and mainly infects the flower and fruit during the seedling stage, mainly infecting flowers and fruits.†Sun Zuowen said that there is a sparse white mold layer on the back of the leaf at the early stage of the disease. When thick and thick white round spots are formed, the leaves are wound up and infected with petioles, fruit stems, and leaves, and the reddish-brown lesions are atrophied and dried. After entering the flowering and fruiting period, the strawberry turns from white to pink; the young fruit can't expand and dry and wilting after the disease; the result is a layer of white hair coloring slow and uneven fruit loses luster and hardens to stop growing; seriously affects strawberry Goods and food value. Concrete Wall Panels,Alc Panel,Hebel Blocks,Large Concrete Blocks,Aac Block Prefab House Co., Ltd. , http://www.china-steelframe.com
There are several measures for how to prevent and control Sun Zuowen: “Firstly, we should choose resistant varieties to cultivate healthy and sterile strawberry seedlings to control the occurrence of the disease.†The organic fertilizer applied at the same time should be decomposed, and the compound fertilizer should be moderately applied, especially the nitrogen fertilizer can not be applied. More to prevent burning seedlings and prosperous; timely watering control soil moisture, greenhouse humidity to meet the strawberry flower fruit requirements for water; reasonable cultivation density can increase greenhouse ventilation and light transmission; timely removal of old leaves, diseased leaves, disease fruit.
"For greenhouse strawberry continuous cropping, it is best to use high temperature stagnation technology to eliminate the bacteria in the soil and diseased bodies, and comprehensively control various soil-borne diseases and other diseases of strawberries. Protect the medicinal varieties with protective bactericidal disease before flowering. Active prevention with 1 × 106 spores / gram of Pythium oxysporum WP 3000 times spray 2% Wuyin bacteria 200 times spray 4% agricultural anti-120 water 400 times spray 75% chlorothalonil WP 600 It takes better to spray the drug once every 7-14 days."
After the onset of strawberry Sun Zuowen also proposed a specific prevention and treatment method: "To use a protective agent for the protection and treatment of 50% ether oxystrobin water dispersion granules 3000 times spray 4% tetrafluoroetherazole water 1000 times Spray 10% diphenyl ether carbenazole water dispersible granules 1500 times spray 7-10 days spray once the drug is used alternately. When the greenhouse humidity is high, 50 m × 8 m shed, 2% ether oxystrobin smoke agent per shed 4 4 or 20% chlorothalonil smoke agent for 4 sheds. Sulfur fumigation fumigation with 99.5% sulphur powder each time 20 grams during the promulgation period, fumigation for 2 hours per day, fumigation, 8 hours per day, continuous use, 7-10 times, recovery period How to use it; the use of fumigation agents is better."