Recently, after the inspection of vegetable samples and field surveys at vegetable bases, the author found that new diseases are currently circulating, and that other diseases are affected by the climate. This is more common than ever. The outstanding problem is that these diseases are easy to change. Incidence of disease is confusing. People often blindly mix and apply various agents based on experience and guesswork, spraying them over and over again, but the disease remains uncontrollable.
Cucumber brown spot
September 10 received a report that Hebei Promise, Yucheng and Nanpi had serious problems. Everyone controlled by bacterial keratoses had no effect. After identification, it was determined that the current disease of cucumber is not bacterial angular spot disease, but it is a newly emerging cucumber brown spot disease in Liaoning, Shandong, and Hebei in recent years, also known as target spot disease.
Diagnosis points: The important difference between the typical symptoms of cucumber brown spot and bacterial angular spot disease is that brown spot pathogen damages the leaves, and the leaves form an irregular or polygonal yellow spot limited by the veins, the size is 6 mm, and both sides of the leaves are colored Similar to the students, grayish black mold. In severe cases, the lesions are lumped together, causing the leaves to dry up. Bacterial keratoses also formed polygonal yellow lesions, but the back of the leaves had white marks formed by white bacteria and pus, which were clearly identifiable.
Formulation: 85% Trichloroisocyanuric Acid Soluble Powder 1500-fold, or 50% Nonenriched WP 1000-fold, or 40% Fuxing-starch 8000-fold, 60% Baitai Water Dispersible Granule 1500-fold The spray was mixed with 600 times the green wind 95 when the leaves were yellow. When spraying, leaves should be filled with drugs. Interval 5 to 7 days, control 2 to 3 times.
Cauliflower and Cabbage
Black rot and black spot
At present, two kinds of diseases are common and all belong to bacterial hazards. However, the law of occurrence is different, and the prevention and control techniques are also different and need to be clearly identified.
Diagnostic guidelines: Black rot is a disease of the entire plant vascular bundle, leaf lesions start from the edge of the leaf, form a "V" shaped lesion, the root can also be susceptible, decay, but no odor. However, the spotted spot on the leaf surface of the black spot showed a purple-brown color and a light inner color. The lesions can be joined together and appear initially on the back of the leaves with yellow leaves.
Prevention formula: 1 black rot should pay attention to the rooting spray, medication for spraying. 2 Rhizome spraying also sprayed the agent on the ground at the same time. 3 Use 85% of the soluble powder of trichloroisocyanuric acid 1500 times, or 20% of the water suspension of Streptomyces roxburgii 600 times, or 77% to kill 500 times + Streptomycin for agriculture, or 47% for Garrinone 500 Double liquid, etc., interval 5 to 7 days, use 3 times. Note that after the rain medication control bacteria spread with water.
Tomato yellow leaf disease
Shijiazhuang City, Xisanzhuang Vegetable Base, a tomato plant greenhouse yellowing the lower leaves, farmers use fungal disease with 3 times the drug does not have much effect. The disease manifested as irregular macules on the leaves, followed by brown spots, and the disease spread from below. The test is physiological yellow leaf spot disease, that is, pseudomonas caused by soil salinization.
Diagnosis points: leaf mold is a common tomato disease, the occurrence is also from the lower leaves of the plant, a piece of chlorotic macular spot appeared on the leaves, but the difference is very important with the yellow cultivar leaf base, the leaves of the leaf spot at the back there is dense The gray-black mold layer, while the plaques of the yellow spotted leaves, no matter how moist, will not produce moldy layers. In recent years, many old shed areas have yellow variegated leaves, and in serious cases, the whole shed of tomatoes has died.
Prevention formula: 1 reduce the amount of fertilizer, in particular, should control the amount of potassium fertilizer. When you need top dressing, you can flush into humic acid organic fertilizer and pay attention to plan the soil. 2 Crush chitin, 1 to 2 kg per mu, activate soil microorganisms, improve the soil environment, and reduce salt damage. 3 foliar spray 6000 times love to receive +600 times the green wind 95, interval 5 to 7 days, spray 2 to 3 times.
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