What is the best medicine for citrus scab, with symptoms and causes?

1. Garden cleaning in winter: Spray 0.5 degrees Baume lime sulfur mixture to reduce the source of the disease. 2. Spring bud stage: When the buds are about 2 mm long, spray a protective agent of 0.5%-0.8% Bordeaux mixture, 80% mancozeb wettable powder 600 times liquid or 46% copper hydroxide water dispersion Granules 800-1000 times liquid, etc. 3. When 2/3 of the flowers have faded: Alternate with the medication used during the spring bud stage, spray the protective agent 80% mancozeb WP 600 times liquid, or 70% mancozeb WP 600 times liquid, 46% hydrogen Copper oxide water dispersible granules 800-1000 times liquid.

1. What medicine is good for citrus scab

1. Garden cleaning in winter

You can spray 0.5 degrees Baume lime sulfur mixture to reduce the source of the disease .

2. Spring bud stage

When the buds grow to about 2 mm, you can spray them with a protective agent of 0.5%-0.8% Bordeaux mixture and 80% substitute Use mancozeb wettable powder 600 times liquid or 46% copper hydroxide water dispersible granules 800-1000 times liquid for prevention and control.

3. When 2/3 of the flowers have faded

You can rotate the pesticides used during the spring bud period and spray the protective agent 80% mancozeb wettable powder 600 times, or For prevention and control, use 600 times liquid of 70% Prozinc (An Taisheng) wettable powder and 800-1000 times liquid of 46% copper hydroxide water dispersible granules.

4. Young fruit stage.

About 2-3 weeks after the last medication, you can spray the therapeutic agent 60% pyraclostrobin? Desenlian water dispersible granules 750 times, or 10% difenocycline 2000 times solution of azole water-dispersible granules, 3000 times solution of 43% tebuconazole suspension, 1000 times solution of 250 g/liter azoxystrobin, etc., and 600 times solution of protective agent 80% mancozeb wettable powder, etc. Prevention and treatment.

2. Symptoms and causes of citrus scab

1. Symptoms and causes of citrus scab

Citrus scab is one of the important fungal diseases of citrus. 1. This disease generally occurs in citrus growing areas in China, and mainly damages citrus leaves and fruits.

(1) Leaf infection

The damage will appear as small yellow oil-soaked spots in the early stage, and then gradually expand into waxy yellow lesions. In the later stage, the lesions will appear lignified and raised, and the leaves The back protrudes and the leaf surface is sunken and becomes funnel-shaped. When severe, the leaves will appear twisted and deformed.

(2) Fruit infection

When damaged, small brown spots will appear, and then yellow-brown conical, lignified tumor-like protrusions will be formed on the peel. The fruit is relatively small, thick-skinned, sour and malformed.

2. Causes of citrus scab disease

(1) The bacteria responsible for this disease are weak parasitic bacteria. Generally, young leaves, young shoots, and young fruits are relatively young and are easily invaded by the pathogen. dye.

(2) In late spring (early May to early to mid-June), the disease will also become more serious in low-temperature, rainy weather.