As the temperature drops, the humidity in greenhouses gradually increases, and diseases such as cucumber brown spot and blight are prone to occur. Attention must be paid to prevention and control.
When brown spot occurred, chlorotic light brown spots were distributed on the leaves of cucumbers, and they were easy to develop after watering. The most obvious symptom of the blight is that the leaves have "V"-shaped lesions inward from the leaf margins, milky white gelatinous substances appear on the guashes, and the shed is susceptible to disease when the humidity is high. After the occurrence of these two diseases, thiophanate-methyl plus chlorothalonil, carbendazim plus thiram, or thimethoxone plus bromine carbendazim can be used to prevent and treat 2-3 times every 7 days. Times.
Bacterial leaf blight occurs with small water-stained brown spots and perforations on the leaves. Bacterial round spot occurred when the leaves appeared smaller round yellow lesions, translucent membrane. These two diseases can be controlled with 30% king copper suspension or 20% methimazole wettable powder 500 times spray. The azole agent will inhibit the growth of the top of the crop, do not spray to the top of the plant when spraying.
Phytophthora root rot, also known as grafted cucumber root rot disease, cucumber grafting survived after the temporary disease, generally 8-10 leaves, as the rootstock of the black root pumpkin roots and lateral root brown decay, causing plant wilting You die. Immediately after the onset of treatment with carbendazim plus dexamethasone and rooting agent root treatment.
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