Brown leaf disease common diseases, resulting in plant growth weakness. Most of them are in the late stage of growth, and in August and September, they are the epidemic period, and they are severely affected by wet and damp conditions. At the beginning of the disease, brown dots were formed on the leaves, and then expanded into brown round spots or irregular lesions. On the back of the lesion, there was gray-black moldy material. When the disease was heavy, the leaves fell off, affecting plant growth and flowering. Control methods: The diseased leaves were cut off and then sprayed with 1:1.5:200 Bordeaux mixture once every 7 to 10 days for 2 to 3 consecutive times.
Powdery mildew occurs in warm, dry or shaded conditions. At the early stage of disease, white dots were formed on the leaves, and then gradually expanded into white patches, which continued to spread over the entire leaf, causing the leaves to yellow, shrink and deform, and finally caused the falling flowers, fallen leaves, and dried branches. Control methods: Dispose of the diseased plants in time; spray 50% thiophanate 1000 times at the occurrence stage.
Anthrax lesions are nearly round in shape on the leaves, and orange-red spots are sticky on the leaves when wet, which is a large number of conidial conidia. Control methods: 1 removal of diseased leaves, concentrated burning; 2 transplanted with 1:1:1:50 ~ 200 Bordeaux mixture seedlings for 5 minutes to 10 minutes; 3 spraying 65% on behalf of the Zinc 500 times or 50% Teflon 800 to 1000 times solution.
After the rust was damaged, dark brown or dark brown dots appeared on the back of the leaves; some had near-circular lesions on the surface of the leaf, and there was one small gingivae in the center, and the leaves were dead when severe. Control methods: 1 After the removal of flowers to remove the dry strains, diseased leaves and concentrated burned; 2 Early onset of spraying 50% dinitranic dispersion 200 times or 25% Triadimefon 1000 times, every 7 to 10 days 1 continuous spray 2 to 3 times.
Powdery mildew occurs in warm, dry or shaded conditions. At the early stage of disease, white dots were formed on the leaves, and then gradually expanded into white patches, which continued to spread over the entire leaf, causing the leaves to yellow, shrink and deform, and finally caused the falling flowers, fallen leaves, and dried branches. Control methods: Dispose of the diseased plants in time; spray 50% thiophanate 1000 times at the occurrence stage.
Anthrax lesions are nearly round in shape on the leaves, and orange-red spots are sticky on the leaves when wet, which is a large number of conidial conidia. Control methods: 1 removal of diseased leaves, concentrated burning; 2 transplanted with 1:1:1:50 ~ 200 Bordeaux mixture seedlings for 5 minutes to 10 minutes; 3 spraying 65% on behalf of the Zinc 500 times or 50% Teflon 800 to 1000 times solution.
After the rust was damaged, dark brown or dark brown dots appeared on the back of the leaves; some had near-circular lesions on the surface of the leaf, and there was one small gingivae in the center, and the leaves were dead when severe. Control methods: 1 After the removal of flowers to remove the dry strains, diseased leaves and concentrated burned; 2 Early onset of spraying 50% dinitranic dispersion 200 times or 25% Triadimefon 1000 times, every 7 to 10 days 1 continuous spray 2 to 3 times.
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