Most of the greenhouse vegetables in the autumn have been settled, and the problems in the greenhouse have begun to increase. In particular, bacterial diseases such as cucumber bacterial leaf spot, tomato ulcer disease, eggplant soft rot and other diseases are highly prevalent. How to effectively prevent and control?
Identify bacterial diseases
The pathogenesis of bacterial diseases is obvious, mainly manifested as: necrosis and decay, wilting and deformity. Necrosis, rot, and deformity are the consequences of bacteria destroying the tissue of parenchyma cells. On the leaves of its reticular veins, the lesions are polygonal, with a yellow halo around the lesion. The lesions on the hypertrophic tissue or fruit are mostly round.
In soft meat and juicy tissues, tissue death is prone to decay. Some parts of the lesions occur after the promotion of lesions, the formation of tumors, this phenomenon occurs mostly on the roots or stems.
Wilt is the result of cells infecting vascular bundles and can occur locally or in whole. After the vascular bundle cells are destroyed, the water and nutrients cannot be transported normally, which will cause the plants to die and die.
Cellular diseases have no hyphae or spores, and there is no mildew on the surface of the lesions, but there are bacteria pus (except root cancer bacteria) overflowing, and the surface of the lesions is smooth, which is the main basis for diagnosing bacterial diseases.
Reduce the probability of wound infection
The main infection of bacterial diseases is carried out from the wound. Therefore, in order to strengthen the prevention and treatment of bacterial diseases, attention should be paid to controlling the infection of wounds. One is to avoid pests from biting, and the other is to avoid artificial wounds.
Pay attention to the insect vents in the shed vents and the hanging wormwood slabs in the sheds. When the pests occur seriously, use them in time. The operations of smearing, heading, smashing, hanging vines, picking fruit, etc. should be arranged on a sunny morning to make the wound dry as soon as possible, avoiding the operation with dew.
When the wind is released, the wind speed should be avoided too much, so that the branches and leaves of the vegetables cause excessive wounds due to swaying and rubbing. After the vegetable plants have wounds, the copper preparation is sprayed with streptomycin for prevention.
The medicaments for timely prevention and treatment of bacterial diseases are mainly copper preparations and antibiotics. It is recommended to mix these two agents when controlling bacterial diseases, and the combination of contact and systemic.
The control agents include quinoline copper, copper oxide, cuprous oxide, king copper, chunleimycin, and zhongshengmycin. It is recommended to proceed step by step. (China Agricultural Materials Media)
This article URL: Bacterial disease prevention methods and effective pesticides in greenhouses
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