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Do not ignore the bacterial diseases of autumn vegetables
At the grassroots level, the author discovered that many vegetable farmers often pay enough attention to and eradicate the fungal and viral diseases, but often overlook the potential and systemic damage of bacterial diseases. For example, cucumbers in the summer and autumn of this year are mostly pulled out by bacteria caused by bacterial leaf spot and keratoses. The reason for this is that vegetable farmers have insufficient knowledge of bacterial diseases and prevention and control are not in place. At present, black rot of cabbage and cauliflower and bacterial leaf blight of zucchini are occurring. According to investigations, the incidence of black rot disease in cabbage and cauliflower in our country is 80%, the diseased plant rate is 70%, and the diseased leaf rate is 40%; the squash is bacterial The frequency of leaf blight is 95%, the diseased plant rate is 100%, and the diseased leaf rate is 42%. Most vegetable farmers are treated with fungal diseases, and as a result many medications have no effect. The following describes the main symptoms and prevention methods. First, the symptoms of identification 1. Cabbage, cauliflower black rot: bacteria invaded by the water hole, causing the leaf edge was "V" shaped lesions, invasive from the wound in any part of the leaf formation of amorphous brown lesions, The edges often have yellow halos, the lesions spread to both sides and inside, causing the surrounding leaves to yellow and die. 2. Bacterial leaf blight of summer squash: Water-stained spots appear on the back of the leaves, and they turn yellow to tan-colored round or nearly round spots of 1 to 2 mm. The lesions are translucent in the middle. Spots around the veins are observed. More. Sometimes infecting the leaf margin leads to leaf necrosis; the young stem is infected and the base of the stem is cracked. Second, control methods 1. Select the seeds to be soaked with warm water at 50 °C for 20 minutes, remove and germinate after drying, or soaked with 1 million units of 500 times streptomycin sulfate soaked for 2 hours, rinse germination after germination. 2. Strengthen field management, remove diseased leaves after harvest and harvest, and bury them in time. 3. Pay attention to the prevention and control of pests such as beet armyworm and white (smoke) mealybugs, reduce wounds and control bacterial reinfection. 4. Use 0.5% amino oligosaccharide 600 to 800 times liquid or 90% neomycinse wettable powder 2500 times or 72% agricultural streptomycin wettable powder 2500 times or 2% plus rice (Chunlei Aqueous solution 400 to 500 times spray. Note that even after severe rainy days, or when the condensation is severe, medication must be used. Normally, the interval is 5 to 7 days.