Symptoms: Diseases can be affected from the seedling stage to the adult planting stage, and the stem bases, leaves and fruits are mainly damaged in the protected cultivation. Seedlings were mostly infected with tender tips. They were dark green water-stained and wilted at first, and gradually became dry and bald-headed, not lodging. The incidence of adult plants is mainly in the stem base or tender stem section, dark green water stain spots, after the soft, significant contracture, wilting of the diseased parts or the whole plant withered; often there are several joint department damage , The vascular bundle does not change color; Leaf lesions produce round or irregular water-soaked lesions, up to 25 mm in diameter, the edge is not obvious, rapid expansion, blue and white when dry, easily broken, when the lesions spread to the petiole The leaves droop. The melon strip or any other part of the disease is affected. It begins to be dark green with water, and gradually collapses. When wet, the surface grows sparsely white mold, rapidly decays, and emits a stink smell.
Control methods:
(1) Select resistant varieties and disinfect seeds before sowing.
(2) More than 5 years of rotation with non-guad crops. The cover film prevents bacteria in the soil from splashing on the plants and reduces the chance of infection.
(3) Grafting and disease prevention. You can use Yunnan black-skin squash or the southern anvil No. 1 as rootstock grafted with cucumber, can prevent disease and blight
(4) Soil treatment. The commonly used soil treatment agents for seedbeds or greenhouses include lime nitrogen, must-kill, codakone, hymexazol, haloxystrobin, metalaxyl, and methotrexate, together with the application of new high-fat lipid membranes to enhance efficacy. .
(5) Seed soaking, can be used 72.2% Prokary 800 times liquid plus 800 times the new high-fat membrane soaking seeds for half an hour after germination.
(6) Strengthen field management and increase plant resistance to diseases. Reasonable fertilization (especially nitrogen fertilizer) should be used to improve light transmission intensity, drain water in time, reduce field temperature, and promote flower bud differentiation; during flower bud stage, young fruit stage and expansion The spraying of guttatine improves the fruit pedicle, promotes fruit development and improves cucumber quality.
(7) Chemical control. After the planting, the seedlings were treated with 10% Kejia suspension 2000-2500 times liquid or 56% azoxystrobin chlorothalonil 800 times, at intervals of 7-14 days, twice. Early onset of medication: 10% Kejia suspension 1000-1500 times, 56% acetochlor 600 times chlorothalonil, 4% pyrimidine nucleoside antibiotic 400 times, 58% thiram Mn-Zn wettable powder 500 Double liquid, 64% anti-virus WP WP 400-500 times, 38% Cucorin copper 800-1200 times, 72.2% Precive 600-700 times liquid, 7-10 days, continuous use 3-4 times.
Ventilation is one of the most important components in a successful greenhouse.
If there is no proper ventilation, greenhouses and their growing plants can become prone to problems. The main purposes of ventilation are to regulate the temperature and humidity to the optimal level, and to ensure movement of air and thus prevent build-up of plant pathogens (such as Botrytis cinerea) that prefer still air conditions. Ventilation also ensures a supply of fresh air for photosynthesis and plant respiration, and may enable important pollinators to access the greenhouse crop.
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