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Overwintering cucumber disease and early prevention
Overwintering and picking cucumbers are prone to viral diseases, bacterial diseases, downy mildew, and root rot, and disease prevention measures should be taken as soon as possible. Soil disinfection before planting to prevent soil-borne diseases. The cucumber needs a large amount of fertilizer. Before the planting, it should be combined with 10-15 square chicken droppings per acre for high-temperature stuffy shed treatment to kill the bacteria in the soil. In the 2 days before planting, the greenhouses should be ventilated to prevent harmful gases in the shed from harming the cucumber seedlings. During the colonization, bio-fertilizers were applied on the acupoints to inhibit the growth of cucumber roots. After the planting, the pesticide was used to control the disease at proper time. In general, cucumber root rot and bacterial blight occur in 4-5 days after planting. The cucumber should be used for irrigation in time after 3-4 days after planting to prevent root diseases. When cucumber stalk grows to about 1 meter, it is prone to bacterial marginal blight (decaying the top of the head), and can be prevented by spraying copper citrate fertilizer plus agricultural streptomycin. It should be noted that many vegetable farmers mistakenly believe that the rotten head is black spot disease, and that a large number of azole drugs such as flusilazole are sprayed and fertilized, resulting in phytotoxicity to cucumbers. Downy mildew is a common disease after cucumber colonization. It can be prevented by metalaxyl or propamocarb hydrochloride spraying after 10-15 days of colonization. After the onset of disease, it can be treated with diurea-manganese zinc and agricultural streptomycin. . Virus disease often occurs after the cucumber is colonized. In addition to regulating the environment of the greenhouse and controlling the transmission of poisonous pests, it should be promptly treated with yttrium-copper acetate or ningnanmycin spray.