Dosage: 80%WDG, 50%, 40%WDG, 80%, 50%, 40%, 25%WP, 50%, 40%, 25%, 20%, 10%SC, 25%ME, 15%, 10%EW, etc.
Features
Dimethomorph is a cinnamic acid derivative, a systemic therapeutic low-toxic fungicide of the organic heterocyclic morpholine class, and is specially used to prevent and control oomycete plant diseases. Its mechanism of action is to destroy the formation of the bacterial cell wall membrane, causing the sporangia wall to decompose, resulting in the death of the pathogen. In addition to the zoospore formation and spore swimming stages, it has effects on all stages of the oomycete life cycle. It is especially sensitive to the formation stage of sporangia and oospores. If the drug is used before the formation of sporangia and oospores, the production of spores can be completely inhibited. The drug has strong systemic absorption. When applied at the roots, it can enter all parts of the plant through the roots; when sprayed on the leaves, it can enter the inside of the leaves. There is no cross-resistance between dimethomorph and benzamide fungicides such as metalaxyl. The agent is not irritating to rabbit skin, slightly irritating to rabbit eyes, has low toxicity to bees and birds, and is poisonous to fish.
Dimethomorph is often mixed with fungicide ingredients such as mancozeb, thiram, chlorothalonil, zinc acetate, calcium copper sulfate, copper king, metalaxyl, cymoxanil, cyanofenazole, fluazinam, aluminum triethylphosphonate, prochloraz, iprodione, pyraclostrobin, azoxystrobin, pyraclostrobin, pyraclostrobin, zhongshengmycin, and copper rosinate to produce compound fungicides to delay the development of drug resistance in pathogens.
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Applicable to fruit trees and prevention and control objects
Dimethomorph is suitable for a variety of fruit trees and is a specialized fungicide that effectively prevents and controls Oomycete fungal diseases. At present, it is mainly used in fruit tree production to prevent and control: grape downy mildew, lychee downy mildew, apple blight, pear blight, citrus brown rot, etc.
Use technology
(1) Grape downy mildew
Spray the grapes once before they bloom and once after they fall to effectively prevent and control downy mildew from damaging young fruit ears. Then start spraying as soon as the lesions first appear on the leaves, once every 10 days, and use different types of pesticides alternately until the later stages of growth. Generally use 80% WDG or 80% WP 4000~5000 times solution, or 50% SC or 50% WP or 50% WDG 2000~3000 times solution, or 40% SC or 40% WDG or 40% WP 2000~2500 times solution , or 25% ME or 25% SC or 25% WP 1000~1500 times solution, or 20% SC 1000~1200 times solution, or 15% EW 800~1000 times solution, or 10% EW or 10% SC 500~600 times solution to spray evenly. When preventing and controlling leaf damage, pay attention to spraying the back of the leaves.
(2) Lychee downy blight
Spray once each at the flower bud stage, young fruit stage and fruit near maturity stage. The spraying times of pesticides are the same as for “grape downy mildew”.
(3) Apple blight
Start spraying from the early stage of the disease, once every 10 days, and spray about 2 times in a row, focusing on the middle and lower fruits. The spraying times of pesticides are the same as for “grape downy mildew”.
(4) Pear blight and rot
Start spraying from the early stage of the disease, once every 10 days, and spray about 2 times in a row, focusing on the middle and lower fruits. The spraying times of pesticides are the same as for “grape downy mildew”.
(5) Citrus brown rot
Start spraying from the early stage of the disease, once every 10 days, and spray about 2 times in a row, focusing on the middle and lower fruits. The spraying times of pesticides are the same as for “grape downy mildew”.
Precautions
Although dimethomorph is a systemic therapeutic agent, it should be sprayed evenly and thoughtfully. When spraying continuously, pay attention to alternate use with other effective agents with different mechanisms of action, or mix them with agents such as mancozeb to delay the development of drug resistance in bacteria. It is strictly forbidden to pollute rivers, lakes, ponds and other waters with remaining liquid medicine and waste liquid from washing medicine equipment. Pay attention to safety protection when using medicine. If the medicine liquid contacts the skin, wash it immediately with soap and water. If the liquid splashes into the eyes, rinse immediately with water. If swallowed by mistake, do not induce vomiting and send to hospital for symptomatic treatment as soon as possible. This medicine does not have an antidote.
