Zucchini is a kind of vegetable that is very common on the table. It is loved by many people, but the zucchini is also prone to disease during planting. Today, I will tell you about the diseases and control measures of zucchini.
1. Zucchini anthracnose
A disease in which zucchini anthracnose anthracnose can occur at any time during growth, mainly affecting the development of stems and leaves of plants. Once infected, the stem and leaf base are damaged, and the affected part collapses and discolors, and then it dies.
Control method
Prevention and control of zucchini anthracnose can be carried out according to the requirements of disease-free early prevention and early treatment of disease, combined with the application of foliar protective agent Jiameijin point. Starting from the flowering and fruiting period of zucchini, regular or irregular spraying should be prevented more than three times. It can be sprayed with 10% difenoconazole 800-1000 times solution or 80% big raw wettable powder 600-800 times solution.
Second, zucchini silver leaf disease
The plant growth was weak, the plant type was short, the leaves were drooping, the leaves at the growth point were shrunk, and the leaves were semi-stagnation, and the upper end of the stem was shortened. The stems, young leaves and functional leaf petioles were chlorotic, and the leaf chlorophyll content was decreased. The initial performance is silvery or bright white along the veins. Afterwards, the whole leaves turn silver, glittering under the sun, but the leaves on the back of the leaves are normal. The young melon and flower stalks and flower buds turn white, and the semi-finished melons and commercial melons are also whitened, showing milky white or white-green, losing the value of the commodity.
Control method
1. Agricultural control. Choosing resistant varieties is an effective method in agricultural control. Cultivating seedless seedlings is the key control measure. In the cultivation of protected land, insect nets can be applied to prevent the entry of whitefly. Adjust the sowing date, and avoid sensitive crops from being damaged at the peak of the silver leaf whitefly, timely remove the residual strains and fumigate the remaining adults, and also reduce crop damage to varying degrees.
2. Biological control. Wherever possible, release the scorpion bee and use it.
3. Chemical control. The early prevention and control of silver leaf whitefly is extremely important. In the early stage of the whitefly, rational selection of pesticides is still an important emergency means. 1.8% Ai Fuding 2000-3000 times liquid, 40% green vegetable treasure 1000 times liquid, plant source insecticide 6% green wave (smoke hundred) 1000 times liquid, 25% sputum 1000-1500 times liquid, 10 % imidacloprid 2000 times solution and 5% regent 1500 times solution have better control effects.
Third, zucchini soft rot
The bacterial soft rot at the base of the stem of the zucchini is mainly the stem base of the damaged plant. At the beginning of the disease, the pathogen invaded from the epidermis or wound at the base of the stem of the zucchini, forming irregular water-like chlorotic plaques at the base of the stem 3-5 cm from the ground, gradually expanding to a yellow-brown color, and the diseased part was softened inward. During the first ear flowering stage, there is a water-soaked pale brown spot on the wound or the petiole wound after the emasculation, the diseased part expands up and down, the sag softens and rots, and the white sticky silk liquid flows out and is mixed with a foul smell. Disease characteristics. Later, as the diseased department expands until the whole plant wilted and died, the dead tissue is rotted or numb.
Control method
1. 15-20 days before the planting of the soil continuous cropping site, the soil is disinfected by using lime nitrogen (calcium cyanamide) plus organic fertilizer (fertilized cow dung, chicken manure, etc.).
2. When planting the planting period, use 77% of the DN Wettable Powder 600 times solution to fill the roots, and then return to the seedlings for the second time, and then 2-3 times every 7 days. When bacterial stem-based soft rot and blight are mixed, the stem base can be sprayed with 60% Baitai (5% pyraclostrobin + 55% Daisenlian) water-dispersible granules 1500 times or 70% methyl Tobuzun WP 1000 times solution can treat both diseases.
3, after the colonization of medication in addition to continue to use the same medicine to irrigate the root, 1 smear: 70% methyl thiophanate WP +3% gram bacter (congenin) wettable powder + 50% succinic acid copper The wet powder (1:1:1) is formulated into a 100-150 times porridge-like liquid, and the water-stained lesions and lesions are applied around. 2 spray: use 3% bactericidal (Zhongshengmycin) wettable powder 800 times, spray once every 5-7 days, and even prevent 2-3 times. The drug was stopped 5 days before the harvest.
Fourth, zucchini powdery mildew
It can occur from the seedling stage to the harvest stage. The leaves are seriously affected, the petiole and stem are second, and the fruit is rarely damaged. In the early stage of the disease, white near-round small pink spots are produced on the foliage or leaf back and young stems, and the leaves have many front faces, and then spread to the periphery to expand into contiguous white powder with unclear edges, and the entire leaves are covered with white powder. In the late stage of the disease, the white mildew spots become gray due to the mycelium ripening, and piles of yellow-brown small grain spots are formed on the lesions, and the small grain spots become black.
Control method
1. Implement rotation or water and drought rotation for more than 3 years. Timely pruning and leafing, it is found that the leaves of moldy leaves should be removed in time. After harvesting the fruits, the leaves of the diseased plants should be removed to the field for burning.
2. In the early stage of the disease, spray with 50% methyl thiophanate 500-800 times solution or 75% chlorothalonil 600-800 times solution or 50% dexamethasone 1000 times solution, once every 10 days, a total of 2-3 times.
The above are about the symptoms and prevention measures of zucchini during planting, for your reference, I hope to have some help for everyone, please pay attention to the Hui Nong School for more details.
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