Main types of tricyclazole fungicides
Inorganic fungicides (copper preparations, sulfur preparations, etc.), organic sulfur fungicides (fumei zinc, thiram, thiram, propyl zinc, daisen zinc, dysen ammonium, mancozeb, dithiocyanomethane, etc. ), substituted benzene (pentachloronitrobenzene, chlorothalonil), diimide (Pythium, chlorhexidine, sclerotium), phytochemical fungicide (Alcetin)
Tricyclazole fungicide:
Including Bordeaux liquid, copper hydroxide, cuprous oxide, succinic acid copper, copper ammonia and the like. Heavy metal ions such as copper can destroy cell membrane permeability, passivation protein, interfere with Mg++, K+ balance, affect chlorophyll metabolism and respiration, and have no selectivity. In order to prevent the phytotoxicity of heavy metal ions such as copper, a poorly soluble salt or complex bactericide is generally prepared to reduce free copper ions. For example, Bordeaux mixture reacts copper sulfate and lime which are easily soluble in water to produce poorly soluble basic copper sulfate. After use, the copper ions are gradually released under the action of biological and environmental physicochemical bactericidal action. This not only extends the duration of the effect, but also increases safety. When high-temperature, high-humidity, and acid and alkaline compounds are used before and after, the release of copper ions is accelerated, which is likely to cause phytotoxicity. Known for Ca++, there are crops such as Solanaceae, Cucurbitaceae, Grape, etc.; those sensitive to Cu++ are Li, peach, pear, cabbage, wheat, etc.; those sensitive to Cu++ are apple, Chinese pear, persimmon, soybean,èŠœç® and other crops.
Symptoms of copper preparations:
1, can make cucumber, apple and other leaves chlorotic, young shoots and leaf margin tips, leaf spots and similar virus disease of the mosaic symptoms, etc., the formation of small black spots on the fruit.
2, can also cause phytotoxicity in rice, some rice varieties are more sensitive, the leaves, especially the leaf margin is reddish brown. For example, after spraying copper hydroxide and cuprous hydroxide for 2 days, the tip and leaf margin may be purple-red or purple-red spots; 30% succinic acid copper is 1:400-700 times sprayed 3 days before rice heading, two days later. The tip of Yuyou 422 has a purple-red color and returns to normal after 5-7 days. However, there is no phytotoxicity on 闵优香粳.
This phytotoxicity is related to high temperature and high humidity. Use in Putian can cause seedlings to be yellow and even dead. Copper salts cannot be mixed with acid-base compounds, such as stone sulphur, rosin, and mineral oil. Crops sprayed with Bordeaux solution should not be sprayed with sulphur in 15 days. Use in the greenhouse, under high temperature and high humidity conditions. Copper preparations have antagonistic effects in combination with thiram and dexame fungicides.
3. Fluorosilicic acid is strongly acidic, and it has phytotoxicity on peanut leaves under high temperature and high humidity conditions; when used on rice, increasing the dosage or causing leaf plaque at high temperature. Mixed with alkaline compounds, easy to break down.
Note the use of tricyclazole bactericide:
Generally, the selectivity is poor, and the target has no difference or small difference between the target and the non-target organism. In use, the difference between the tolerance of the pathogen and the crop is mainly used, and the dose is appropriately selected in an appropriate period.
This type of fungicide must not be systemic, so as to avoid phytotoxicity, and only have a protective effect against plant diseases. If the penetrant is added to the processing or the particles are too fine, and the plant body is entered through different routes, the phytotoxicity can be caused.
More pesticide knowledge, please pay attention to China Pesticide Network
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