Scientific control of strawberry diseases and insect pests
At present, it is a critical period for the growth of strawberry seedlings in the suburbs of Beijing, and it is also a period of high incidence of diseases and insect pests. in order to ensure the breeding of healthy seedlings without diseases and insect pests, it is necessary to monitor and investigate the occurrence of diseases and insect pests in the seedling breeding base. and do a good job in scientific prevention and control in time. The investigation shows that due to the high humidity in the facility, powdery mildew is common in strawberry nursery plots; due to recent continuous rainfall, strawberry anthracnose in open field is in the initial stage and has a trend of further development. In the prevention and control of strawberry powdery mildew at seedling stage, due to the current situation of resistance to ether carbendazim, it is suggested that attention should be paid to ventilation and humidity reduction at the same time, 50% sulfur suspension 200 times liquid, or 2% Wuyisin water agent 200 times liquid, or 2000 times solution of 30% fluoxazole wettable powder for foliar spray control, to avoid carrying bacteria in seedlings as far as possible. In the prevention and control of strawberry anthracnose, it is suggested that conditional seedling fields can be covered with plastic film to protect themselves from rain in order to reduce humidity and cover shading net to reduce temperature during high temperature. At the initial stage of the disease, you can choose 75% chlorothalonil wettable powder 500x liquid, or 50% imipramine wettable powder 1500 times liquid, or 70% mancozeb wettable powder 500x liquid spray or root irrigation for prevention and treatment, spray once in about 7 days, spray 3 to 4 times in a row, and the medicine should be used in rotation.
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Two major factors lead to greenhouse strawberry deformity
According to the investigation and analysis, there are three main causes of deformed fruit, and the corresponding countermeasures can be taken to prevent the occurrence of abnormal fruit. Low room temperature is a common cause of deformed fruit. The optimum temperature for strawberry growth and development was 20-25 ℃. The lowest temperature during flowering and fruiting period should not be lower than 5 ℃, if the temperature is 5 ℃.
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Techniques of promoting flowering of strawberries in greenhouse
The purpose of strawberry cultivation is to produce early and appear on the market early, and the key measure is to promote flower bud differentiation and flowering. The measures to promote flower bud differentiation were carried out at the seedling stage, and flowering should be promoted after transplanting. The methods of promoting flowering are as follows: 1. Temperature and humidity management in the greenhouse. The temperature in the shed is 30 degrees during the day and above 10 degrees at night.
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