Cucumber downy mildew, brown spot, and bacterial spot disease all damage the leaves, resulting in decreased photosynthesis and affecting yield.
Therefore, we must promptly control downy mildew disease: True leaf disease, leaves or leaves will appear on the back of the water immersed lesions, particularly evident in the morning, the lesion gradually expanded, limited by the veins, showed a pale brown or yellow brown patches, humidity When the big leaves grow on the back or leaves of gray mold layer, later lesions rupture or contiguous, resulting in leaf margin curling dry, severe patches of a yellow, mostly in the upper leaves of cucumber. Available 72.2% Propocarb (Precise) Aqueous 600 times, 69% Manganese Zinc (Anketone) Wettable powder 800 times, 60% Manganese Fluoride (Extinguished) WP 700 times Liquid spray control.
Brown spot: The lesions appear light brown and brownish green at first. They are slightly rounded and 6 to 12 mm in diameter. Most of the lesions are limited by the veins and they are irregular or polygonal. Some of them are gray to the middle. Gray-brown, with grayish black mould, severe lesion integration and dead leaves. However, the lesions of brown spot do not gradually expand with the development of the disease, only the size of rice grains, and most occur in the upper leaves of the plant. Can be used 50% carbendazim WP 500 times, 75% chlorothalonil (Dakkoning) WP 600 times, 78% MnZn (Cobo) wettable powder 600 times spray control.
Bacterial keratopathies: The true leaf disease is immersed in fresh green water at the beginning of the disease. It gradually changes to light brown, the lesion is limited by veins and is polygonal, gray-brown or brownish, and when the humidity is high, the leaves overflow with milky turbid water. Beady pyogenic, white marks after dry, the disease is brittle and easy to perforate, not with brown spot and downy mildew. Bacterial keratoderma: available 47% Chrysanthemum Copper (Garenone) WP 700 times, 78% MnZn (Cobo) WP 500 times or 40% Chick WP 600 times Liquid control.
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