General situation of vegetable diseases and their drugs

Viral disease, soft rot, white rust, clubroot and black spot are common diseases on vegetables. 1. Viral disease: Veins first appear on th

General situation of vegetable diseases and their drugs

Viral disease, soft rot, white rust, clubroot and black spot are common diseases on vegetables. 1. Viral disease: Veins first appear on the heart leaves, and then cause mosaic and shrinkage. Severe diseased plants will be dwarfed and deformed. Usually, this disease can be prevented by planting disease-resistant varieties. 2. Soft rot: translucent at first, with water stains, then turned gray or brown, and the epidermis was slightly sunken. It can be controlled with 72% agricultural streptomycin 3000-4000 times solution. 3. White rust: there are yellow-green irregular spots (unclear edges) on the front of leaves, which can be controlled with 500 times solution of 25% metalaxyl wettable powder.

First, viral diseases.

1. After the onset, bright veins will appear in the heart lobe, followed by mosaic and shrinkage. When the disease is serious, the plants will be dwarfed and deformed, while some plants with mild disease generally will not be dwarfed, but they often bear poor fruit after bolting.

2. Choose disease-resistant varieties and strengthen water and fertilizer management. Sick and weak seedlings need to be eliminated in time. In order to cultivate strong seedlings and enhance the disease resistance of seedlings, formula fertilization technology can usually be used.

Second, soft rot

1. At the initial stage of onset, it is generally translucent with water stains, and generally turns gray or brown after 2-3 days. The epidermis is slightly concave with white bacterial mucus on it. When it decays, it usually gives off a special smell.

2. Generally, 72% agricultural streptomycin can be used for prevention and control, and partial application of nitrogen fertilizer should be avoided when planting.

Third, white rust.

1. After the onset, irregular spots with unclear edges will appear on the front of the leaves, and the color is yellow-green. However, when pedicels and flower organs are damaged, they will generally be deformed and hypertrophy.

2. Generally, 2500 times of triadimefon wettable powder or 500 times of 25% metalaxyl wettable powder can be used for control.

Fourth, clubroot disease

1, rhizomatosis generally mainly harms underground roots. Roots are usually stimulated by germs, and cell proliferation increases, forming tumors of different sizes.

2. Generally, drugs such as pentachloronitrobenzene, carbendazim, tobrazine, bendazole and cardan can be used for prevention and control, and the seedbed should be disinfected at ordinary times.

Verb (abbreviation for verb) black spot disease

1, at the beginning, there will be faded spots on the leaves, and then slowly expand into round lesions, which are taupe or brown, and obvious concentric circles and yellow-white halo can be seen around the lesions.

2. Generally, it can be controlled by 500 times of 64% antiviral alum wettable powder, 500 times of 58% metalaxyl manganese zinc wettable powder or 800 times of 50% Lide wettable powder.