Zucchini, like tomatoes, are imported, but they have become everyday vegetables in North and South China. Its unique taste and high nutritional value, especially vitamin C, glucose and other nutrients, are very popular in the market. The spring ploughing time is just right for planting zucchini in the greenhouse, but in the process, we must pay attention to the impact of these three diseases. Let ’s take a look together.
First, virus disease
1) Disease characteristics:
Both can occur during growth. Appears as flowers and leaves, in severe parietal deformity, become chicken claw-like, dwarf does not produce melon or melon deformity, early onset can cause whole plant wilt.
2) Prevention methods:
The seeds are disinfected, soaked with 10% trisodium phosphate for 20 minutes, washed and promoted germination and seeding, or soaked with warm water at 55 ° C for 40 minutes and then germinated and seeded, all have good control effects; 20% virus A wettable powder can also be used in the early stage 500 times solution or 1.5% plant disease spirit 1000 times solution, 0.5% antitoxic agent No. 1 water solution 250 ~ 300 times solution, combined with foliar spraying potassium dihydrogen phosphate is more effective, spray once every 7-10 days, even Spray 2 ~ 3 times, the effect is better.
Sclerotinia
1) Disease characteristics
The disease is mainly stem vines and squash. When severe, the diseased stem is split and withered, and black sclerotia appear in the stem.
2) Prevention methods
Spray 50% Pythium Lico wettable powder 1000 times liquid or 50% vinyl sclerotia Lico wettable powder 500 times liquid, 40% sclerotia net 1000 times liquid, 50% carbendazim wettable powder 500 times liquid, Spray once every 10 ~ 15 days, and two sprays have better effect.
Third, downy mildew
1) Disease characteristics
The disease often develops on the leaves. When the seedlings are diseased, they will turn green and yellow, and eventually die. Under high humidity conditions, a gray-black mold layer grows on the back of the lesion. In severe cases, the lesions become patches and the whole leaves are yellowish brown and withered.
2) Prevention methods
In the early stage of the disease, chlorothalonil aerosol can be used for fumigation, each time using 200-250 grams of 45% chlorothalonil aerosol, and the piles are evenly rotated in the protected area. After being ignited, the shack is generally started in the evening and ended the next morning. The medicine can be controlled by spraying 40% ethylphosphate aluminum wettable powder 200-300 times liquid, 25% rhizopus wettable powder 600-800 times liquid and spraying once every 7 to 10 days, which can be used alternately.
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