After the cold wave, during the strawberry fruit period in winter, the two most susceptible diseases in the shed are low temperature and high humidityBotrytis cinerea, powdery mildew。Winter is usually poor in light transmission and ventilation, according to the pathogenesis principle of gray mold powder, early prevention can greatly reduce the probability of disease.
Strawberry powdery mildew usually occurs on leaves, petioles, fruits, flower branches, where the powdery mildew fungus likes sweetness, and the most harmful to the fruit. Strawberry gray mold mainly damages flowers and fruits, infecting from the sepals into water-soaked dots, slowly expanding to the ovary and young fruits, and finally the fruit rots into gray-brown mold.
Strawberry powdery gray mold is a fungal disease, which has the characteristics of fast onset, fast spread and fast spread. Botrytis is prone to occur under low temperature and high humidity conditions;White powder is high temperature and high humidity, high humidity and dryness, low temperature and high humidity are easy to occur. The low temperature and high humidity of powdery mildew coincide with the onset conditions of gray mold, and the suitable temperature is 15-25 and the humidity is 90%, at this stageBotrytis cinereaPowdery mixing occurs
Physical control:
1.Pull high temperature: choose good light weather, last for 2-3 days, the temperature in the shed rises to more than 30, the high temperature lasts for at least half an hour, through high temperature to sanitize the spores of low temperature disease, greatly reducing the probability of infection with gray mold white powder.
2.Botrytis is deceiving, and strawberry plants with wounds or lesions are selected to invade, and the diseased fruit leaves are picked out in time to reduce the source of infection in the field.
3.The demand for water is high during the flowering and fruiting period, and the humidity is inevitably high after watering, so timely ventilation and humidity reduction.
4.Choose strawberry varieties that are resistant to gray mold powdery mildew, like Sweet Charlie, Miao Qi, Ning Yu, etc.
Pharmaceutical prevention and control:
Botrytis control agents are: rot, pyrimidamide, pyricyclamide, pyrimemychlor, isobacteria, etc.;In the early stage of powdery mildew, etherstrobin, benzenoketone, ether condymid, pyridoxystrobin, pyracolidine and other ingredients are used. For the prevention and control of gray mold powdery mildew at the same time, you can choose the gray mold powdery mildew program, which can be quickly depowdered within 24 hours, and the fumigation effect is better. It is recommended to pre-spend prevention, if the disease is serious, choose to spray before 3 pm and before 5 pm.