Greenhouse strawberry to prevent powdery mildew at seedling stage

In early October, the powdery mildew of greenhouse strawberry seedlings has sporadically occurred. The onset time is ahead of schedule and the severity of the disease is increasing. The area of ​​occurrence is increasing year by year, which seriously affects the yield, quality, and food safety of strawberries. The growers should strengthen the field management of strawberries, scientifically select pesticides for prevention and control, use comprehensive prevention and control measures to control the occurrence, development and spread of powdery mildew in greenhouse strawberry seedlings, minimize the losses caused by diseases, improve product quality, and increase planting income.

Damage symptoms

Strawberry powdery mildew occurred mainly in the greenhouse after the shed, which mainly invaded the leaves at the seedling stage, and flower and fruit were mainly infected in the flower and fruit stage. In the early stage of disease, there is a sparse white mold layer on the back of the leaves. As the disease progresses, the mold layer becomes thicker and forms thicker white round spots. In severe cases, the leaves roll up and infect the petioles, fruit stems, and the leaves produce reddish-brown lesions. The leaf margins are atrophic. Dry; flowers from susceptible to white to pink; young fruit after the disease can not be normal expansion, dry wilt; results of the consequences of a layer of white hair on the surface, the color is slowly uneven, the fruit loses luster and hardened to stop growing; seriously affect the strawberry The commodity value and food value.

Prevention

Agricultural measures: Selection of disease-resistant varieties, cultivation of robust and sterile strawberry seedlings, and control of disease occurrence.

Cultivation management: rational management of water and fertilizer; application of decomposed organic fertilizer, compound fertilizer to be appropriate, in particular, nitrogen fertilizer can not be used too much to prevent burning seedlings and prosperous; timely watering to meet the water needs of the seedling period; use the tuyere to adjust the indoor temperature , Humidity; timely removal of old leaves, diseased leaves, clean the pastoral, increase the ventilation and transparency of greenhouse strawberries.

Chemical control: For susceptible varieties, such as Hongyan, Hongxia, etc., they are actively prevented with protective fungicides at the seedling stage without disease and early stage of disease. 99% of mineral oil 200 times solution plus 1106 spores per gram of Pythium oligorum can be used. Wet powder 3000 times spray, or add 2% Wuyimycin water spray 200 times, or add 4% farm water 120 water spray 400 times spray, or add 75% chlorothalonil wettable powder 600 times spray, 7 to 14 days Once sprayed, the use of agents alternates better.

After the onset of disease, use chemical agents with protection and therapeutic effects, use 99% of mineral oil 200 times plus 50% of oxastrobin water dispersible granules to spray 3,000 times, or add 4% of tetrafluoroether azole water to spray 1000 times, or Add 10% difenoconazole water dispersible granules 1500 times spray, 7 to 10 days spray once, the effect of alternate use of agents is better.

Pharmacy fumigation: When the greenhouse humidity is high, 50m 8m sheds use 4% 2% ether oxime ester smoke agent/shed, or 20% chlorothalonil smoke agent 4/shed shed, sulfur vulcanizer fumigation every time 99.5% sulfur powder 20 grams, fumigation 2 hours per day in the prevention period, the onset of fumigation every day for 8 hours, after 7 to 10 times in conjunction with the recovery of the use of preventive methods; fumigant alternate use of better.

Precautions

1. The focus of strawberry powdery mildew is prevention, and the control effect is limited after serious illness.

2. The azole drugs are commonly used in the prevention and treatment of strawberry powdery mildew in the greenhouse. If one dose is too large or is used for many times, the growth of the strawberry will be inhibited.

3. The use of a large number of agents can cause deformity later in life.

4. Pay attention to safe operation and avoid poisoning.

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