Zhongxi County strawberry grower Li Xiu asked: The first section of the greenhouse strawberry looks relatively normal, but recently it has been found that the root discoloration, the entire strawberry wilting, serious lack of seedlings off the ridge, wolfberry control?
Answer: This may be caused by the root disease of strawberry. One is root rot in red columns and the other is root rot. The root rot of red columns has been severe in low-lying areas. The initial symptoms of the roots are red or reddish in the central column, and then turn dark brown and rot. The edges of the leaflets at the base of the above-ground seedlings begin to turn reddish-brown and then wilting again, but the leaves are green. The disease is a kind of root rot Phytophthora root disease, the soil-borne disease, when the local temperature below 20 °C, the oospore germination began quietly invade the roots of strawberries, in the frequent watering of the soil when the humidity is high, the ground temperature 10 °C, the disease Induction is serious. If the temperature rises gradually, the disease will be alleviated accordingly.
When the initial symptoms of root rot occur, the edges of the base leaves show a reddish-brown color, and when severe, the leaves of the whole plant shrink and die from the bottom up. The central column of the susceptible root is red or reddish-brown, and then turns dark brown and decays. The important sign of the disease is that the central part of the root that is not rotted is also red. Root rot is a low-temperature Phytophthora infested by soil, but it only harms strawberries. Strawberry grown in low fields or in poorly drained fields has a high chance of getting sick when the ground temperature is below 25°C.
The symptoms of these two diseases are somewhat similar, and the pathogenesis and the route of transmission have similarities. Therefore, prevention and control measures should be implemented together. From the aspect of agricultural prevention measures, the first is to implement crop rotation; the second is to select disease-resistant varieties; the third is to open wells and trenches around the field; in particular, high-riding cultivation should be done to make rain and ditch dry; Organic fertilizer, enhance disease resistance. In terms of chemical prevention and control, one is to use 50% manganese zinc aluminum wettable powder to soak seedlings before planting; the other is to use 70% ethosphosphine manganese zinc wettable powder 500 times liquid to irrigate; third is to use 20% disease Yike Emulsion 2000 ~ 2500 times spray; four is with 3% polyoxygen water agent 600 ~ 800 times Irrigation root.
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