Symptoms The cucumber target spot disease mainly damages the leaves, and when it is severe, it spreads to the petiole and stem vine. The front and back of the blade can be damaged. The diseased leaves begin as yellow water-soaked spots. As the lesions continue to expand, the lesions on the front of the leaves are slightly depressed, the lesions are nearly round or irregular, and the lesions are peripherally brown. The middle part is pale yellow and there are obvious boundaries between diseased and healthy tissues. Mid-morbid lesions are easily perforated, and the lesions on the front of the leaves are rough and uneven. The lesions turn brown as a whole. The center is gray and translucent, and the center of the lesion often has a clear eye-like bull's-eye. When the humidity is high, the lesion is often accompanied by ring-shaped gray black mold (conidial stems and conidia). In severe cases, dry leaves die and cause premature pull.
Diagnostic guidelines The main difference between the typical symptoms of cucumber target spot and bacterial angular spot: The lesions on the target spot are similar in color on both sides of the leaves. When the humidity is high, there are grayish-black molds; on the back of the bacterial leaf spot The white marks formed by the white bacteria solution are clearly visible and have no mold layer on both sides. Differences between cucumber target spotting and downy mildew: Target spot disease is clearly visible at the junction of health and disease, and the lesions are rough and uneven; the downy mildew disease is unclear at the junction of health and disease, and the diseased leaves are retreating green and yellow, and the lesions are very flat.
Control methods to strengthen the cultivation and management: timely removal of disease vines, diseased leaves, diseased plants, and brought to the field burned, reducing the initial dip source. Science watering, small water ground irrigation, to avoid flood irrigation, pay attention to ventilation and dehumidification, increase light, to create conducive to the growth and development of cucumber, is not conducive to the germination and germination of the invasive temperature and humidity conditions. Chemical control: Use 0.5% amino oligosaccharide 400-600 times or s-Mulletin spray to prevent. After the onset of illness, use 25% Amiexil suspension 1500x, or 40% Shijiale 500x, or 25% prochlorant 1500x, or 40% Fuxing 8000x, or 40% methicillin The azole emulsifiable concentrate 3000 times liquid, sprays once every 7 to 10 days, sprays 2 to 3 times even. Severe disease, plus spray copper preparations, can be sprayed 30% nitro humic acid copper wettable powder 600 ~ 800 times liquid. Foliar spray alternated with medication. It is better to add appropriate amount of foliar fertilizer to the liquid. Spraying focuses on spraying the middle and lower blades.
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