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What are the symptoms of grape black spot disease?
It is a fungal disease that mainly affects the green, tender parts of grapes, such as young fruit, leaves, petioles, fruit stalks, and young shoots. Black spot disease can occur from bud break to the late growth stage, and causes severe damage in spring and summer. When young fruit is infected, dark brown halos first appear, resembling a "bird's eye" pattern, and the lesions often merge into large patches. Later, the lesions harden or crack,...
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How to prevent and control pests and diseases during the rice seedling-raising period
During the rice seedling-raising stage, phenomena such as stunted rooting, yellowing, and stalled growth are prone to occur. For fields where stunted rooting has already occurred, drainage should be carried out immediately to increase temperature and aeration and reduce toxicity, and at the same time quick-acting nitrogen, phosphorus, and potassium fertilizers should be applied, along with supplementary micro-fertilizers, with zinc fertilizer being the key; where deficiency symptoms are present, the corresponding deficient nutrient fertilizer should be applied promptly. Withdraw the water and sun the field, or use circuitous...
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Timely early transplanting of rice helps increase yield
As a supporting seedling-raising method for manual transplanting, the wet seedling-raising technique for rice is suitable for seedling raising across different regions, rice-growing seasons and different types of rice varieties, and is widely adopted in China. This technique is easy to operate, widely applied and highly adaptable; when mastered properly, it produces seedlings of good quality and high yield. 1. Seedbed preparation...
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What are the control measures for cabbage yellow leaf disease (defoliation disease)?
Yellow leaf disease in cabbage-type vegetables is a general term for fungal-type yellow leaf disease of cabbage-type crops. Heading cabbage, yellow-bud cabbage and other Chinese cabbages, and pak choi are all affected by yellow leaf disease from north to south. Symptoms appear at the seedling stage. The damaging fungus is Verticillium fusarium of the genus Brassica, belonging to the Deuteromycotina. This disease can be controlled through chemical spraying or field...
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Detailed Explanation of Technical Measures for Chinese Cabbage Disease Control
Downy mildew, viral disease, soft rot, and tipburn are the main diseases of Chinese cabbage. 1. Downy mildew can occur from the seedling stage to the heading stage, mainly affecting the leaves of Chinese cabbage. It first appears on the lower leaves, producing water-soaked, pale yellow, angular lesions on the leaves, which gradually expand and turn yellowish-brown...
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Detailed Introduction to the Symptoms of Grape Brown Spot Disease
Symptom identification: This is a fungal disease that mainly affects leaves. It is divided into large-spot lesions and small-spot lesions, caused by two different pathogens. Large brown spot disease initially forms circular or polygonal lesions around the leaf veins. The lesions are brown to dark brown with red-brown edges, and a yellow-green halo surrounds the lesions. They gradually expand to form brown...
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What pesticides are used to control common diseases of greenhouse grapes
Pesticide control measures for various diseases of greenhouse grapes: Control method for grape downy mildew: clean up the orchard, spray 5 degrees Baume lime sulfur mixture before bud break, spray once every half month starting from the young fruit stage, and spray 40% metalaxyl 800-1000 times dilution when the disease occurs. Control method for grape white rot: clean the orchard, starting from June every...
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Key Technical Points for Controlling Diseases, Pests and Weeds in the Field After Rice Seedling Broadcasting
Southern rice black-streaked dwarf disease is a viral disease mainly transmitted by the white-backed planthopper. It mainly harms staple grain crops such as rice and corn. Once a crop is infected, the plant becomes stunted, tillering increases, and in the later growth stage the diseased rice cannot head or set grain, sometimes resulting in a complete loss of harvest, seriously threatening the safety of our county's grain production. In order to scientifically...
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Causes and Control Methods of Rice Deadheart Disease
Key Points of Rice Dry Seedbed Cultivation Technology 1. Apply sufficient base fertilizer: In combination with deep ploughing or leveling the field with irrigation water, apply 30-40 kg of rice-specific compound fertilizer, ammonium bicarbonate and 20-25 kg of ordinary calcium superphosphate per mu, applied all at once as a middle fertilizer. Fields with broad bean as the previous crop should receive a larger amount, while vegetable or potato fields should receive a smaller amount. 2. Transplant shallowly and sparsely at the right time...
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Complete Guide to Pest and Disease Control Measures for Cherry Tomatoes
The cultivation techniques are as follows: 1. Sow at the right time. This variety is suitable for autumn sowing; seedlings can be raised starting in late May to early June, transplanted in July, and harvested starting in September. To prevent the spread of seed-borne viruses, disinfect the seeds before sowing: wrap the seeds in gauze, soak them in a 15% trisodium phosphate aqueous solution for 10 to 20 minutes, then...
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