Cucumber is one of the common vegetables on the table. It can be eaten raw food, and the cucumber tastes fragrant and the flesh is crisp and popular. In the process of planting cucumbers, the cucumber leaves are yellow and watery. What causes this?
First, the symptoms of cucumber bacterial diseases
There is a small water-infested spot on the back of the cucumber leaf. The front of the leaf is yellow, and the yellow area of ​​the disease is enlarged. The common disease is bacterial disease. The pathogen is mainly buried in the seed for winter, and the seed is transported for long distance, and the field is close. Infection mainly relies on rainwater sputtering.
Bacterial leaf spot of cucumber is mainly harmful to leaves. The leaf spot is nearly round, small, and has a diameter of 1 to 2 mm. It is initially chlorotic and water-stained, and then turns yellow-yellow to yellow-white. There are more lesions in the proximal vein; the symptoms are not obvious, and the lesion is slightly moist when wet. Sticky feeling.
Second, the prevention and treatment of cucumber bacterial diseases
Method 1, bacterial disease; disease performance: pathogen infected plants, initial control; prevention and treatment methods: bacterial diseases, the incidence is mostly due to the lack of humidity of the plant, resulting in lower humidity, control can choose to kill or acetaminophen or leaf The use of cumazole or streptomycin or neutrophin in combination with natural brassinolide spray treatment, two to three times at intervals of seven to ten days! Note: medication must pay attention to the amount of secondary dilution is now available!
Method 2, bacterial diseases lead to the use of 77% copper hydroxide 150-200 g / ag spray 25% copper ammonia 124-184 ml / acre spray 20% thiazole zinc 300-500 times liquid spray 6% spring leimycin 25- 40 g / mu spray 30% allicin 50-80 ml / mu spray zhongshengmycin, 20% leaf cumin 100-150 g / mu spray 2% agricultural puromycin 14-28 g / a spray 50% chlorine Bromine isocyanuric acid 50-60 g / mu spray can be used with the above agents + potassium dihydrogen phosphate + Bi protection alternate use
Method 3, bacterial disease is recommended to use 25% ammonia copper 124-184 ml / mu spray, 20% thiazole zinc 300-500 times liquid spray 30% allicin 50-80 ml / acre spray 20% leaf bromide 100- 150 g / mu spray 50% chlorobromoisocyanuric acid 50-60 g / mu spray can be combined with potassium dihydrogen phosphate + Bi-protection alternate use, interval seven days, and even two to three times.
Method 4 is a bacterial disease which can be controlled by a copper preparation such as neutrophin, chunleimycin, flavonol, allicin, copper, quinoline copper, thidium copper, and thiabium copper.
Method 5, cucumber downy mildew and bacterial angular spot disease mixed, using enoylmorpholine, cream urea manganese zinc, silver fat, ethyl phosphorus aluminum manganese zinc, chlorfenapyr hydrochloride, metalaxyl manganese zinc, etc. Add zhongshengmycin or sputum flufenic acid control.
Bacterial diseases mainly harm the leaves of cucumber and affect the growth and development of cucumber. Only by taking good control measures can the quality and yield of cucumber be effectively improved.
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