As the use of fungicides in crops is becoming more and more common, triazole fungicides are gradually coming into sight. Triazole fungicides have a broad spectrum, high efficiency, strong internal conductivity, etc., and are currently used in production. A wide range of fungicides, but because of its different formulations, its characteristics and the use of effects, methods are also different. However, when many farmers use such fungicides, they do not understand the correct use of techniques and therefore may suffer from phytotoxicity.
Triazole fungicide tips
Triazole bactericides used in production include diniconazole, tebuconazole, propiconazole, triadimefon, and oxadiazole, as well as fungicides formulated with these pesticides.
Triazole bactericide is a bacteriostatic and bactericidal effect by inhibiting the synthesis of ergosterol in fungal cell membranes. It is an agent for fungal diseases. Fungal cells have cell walls and cell membranes. In the cell wall of most fungi, chitin and glucose are used as the backbone, which is filled with various polysaccharides and glycoproteins derived from cell membrane secretion. substance. Different from other organisms, the fungal cell membrane contains a large amount of ergosterol, and the triazole fungicide inhibits the synthesis of these ergosterols in the fungal cell membrane. Therefore, it is effective in preventing fungal diseases, but it is also useful for bacteria, viruses, and other pathogens. The resulting crop diseases are ineffective.
Triazole bactericide should master the use period. It cannot be used early in crop growth. For example, before the tillering of the grass crop or before the flower bud differentiation of the broadleaf crop, the use at this stage will have an adverse effect on the crop growth. If the top of the crop grows slowly, shorten the internodes of the crop plants. In general, compared to broad-leaved crops, trifoliate crops are more tolerant to triazole fungicides, triazole fungicides can inhibit the synthesis of gibberellin in crops, and premature use is not conducive to the normal growth and development of crops. In the control of rice sheath blight, rice blast, rice smut disease and other fungal diseases, before and after heading rice should pay attention to the triazole fungicide. Because after application, it can be quickly absorbed by rice and transmitted in the body, and the effective period is generally up to about 20 days, and the disease has a good control effect at the usual dose. They are especially suitable for use before or after the jointing of rice. If the triazole bactericide is used excessively or continuously before and after rice heading, it may cause earing especially when it encounters continuous low temperature and rainy weather in the short term after application. Difficulties, reduced fertility rates, and reduced yields. Different triazole fungicides have different levels of crop growth inhibition.
Different triazole fungicides have different spectrum of prevention and control. For example, propiconazole is mainly used for leaf spot, blight, anthracnose, powdery mildew, and leaf mold in crops; tebuconazole is mainly used for the control of powdery mildew, rust, scab, blight, and root rot. Diseases, leaf mold, various spot diseases, etc., especially for leaf spot disease of eggplant vegetables, good control effect; fluorosiliconazole control effect on crops such as powdery mildew, scab, leaf spot, rust, etc. Well, it has a long effective period, strong permeability, and is prone to cumulative toxicity. Therefore, the interval between applications should be more than 10 days; powdery mildew, rust, leaf spot, and blight, early in the crop with benziconazole Diseases such as blight, blight, root rot, and leaf mold have good control effects. Sometimes two triazole fungicides can be mixed together to exert better bactericidal effect. For example, propiconazole and difenoconazole, propiconazole, and tebuconazole, prochloraz, and imazalil, etc., mixed with them to give better sterilization effect.
The best time to use triazole bactericide is the initial stage of pathogen infection. If you like Lectra is a broad-spectrum triazole fungicide, it can be used to treat a variety of fungal diseases. It can be used to control powdery mildew, rice smut, black spot, etc. in rice, Chinese cabbage, apple, pear and other crops. Ringworm disease, spotted deciduous disease, etc., all require the use of drugs at the beginning of the disease. The main use of foliar spray, applied once every 7-10 days, 2-4 times in a row, the prevention effect is good. In the early stage of the onset of treatment, the germs begin to form in the host, while absorbing organic nutrients while developing new conidial spores. At this time, the triazole fungicide is used, which can just act as a bactericidal effect of the therapeutic agent. The pathogenic spores kill in time to prevent re-infection of pathogens.
The triazole fungicide is preferably mixed with other fungicides of fungicides, which will not only have better results, but also help prevent the bacteria from developing resistance to the agents. In the production of triazole bactericide and pyrazole azoxystrobin, copper preparations, mancozeb and other protective fungicides mixed use, this can first kill most of the germinating spores before germination, and then remove Residues of bacteria that have invaded the crop make it bactericidal. Another example is the combination of tebuconazole and Jinggangmycin in the prevention and treatment of wheat and rice sheath blight, which will help improve the control effect against sheath blight. In the prevention and treatment of wheat rust, the combination of tebuconazole and Jinggangmycin can improve the control of rust. If the wheat seedlings in the field have a suitable increase in the amount of pure drug use per mu, it will not only effectively prevent and control rust, powdery mildew, and sheath blight, but also inhibit the internode extraction at the jointing stage of wheat seedlings, which will help prevent and control the late lodging of wheat. . In the spring wheat field, when pests (mainly aphids and red spiders) are treated with tebuconazole and Jinggangmycin, they can be added with pesticides such as omethoate, beta-cypermethrin, avermectin, etc. Rational preparation of liquid medicine, can play both the treatment of disease but also the role of insecticide. However, it should be noted that when triazole bactericides are used in paddy fields, gibberellic acid should not be added. The inhibitory effect of triazole fungicides on rice is very weak, and normal use of drugs will not adversely affect rice growth. When adding the broad-spectrum plant growth regulator gibberellic acid, attention should be paid to the sensitivity of different rice varieties to gibberellic acid, and it is better not to add gibberellic acid without knowing the sensitivity of rice varieties to gibberellic acid. To prevent the rice from pulling too long under the panicle, resulting in late lodging.
Pay attention to the safe dose used. The use of triazole fungicides is a problem that is easily overlooked. In the prevention and control of late rice disease in recent years, overdosing has frequently occurred, and some of these fungicides have been used continuously for a short period of time, or with other bactericidal agents. The use of a mixture of agents tends to lead to an increase in the length of the upper 2-3 internodes before heading in the late growth stage of rice and adversely affect rice growth. Also pay attention to the safe use of the concentration, such as the control of leaf spot disease, anthrax, powdery mildew, etc., when using 25% propiconazole EC, the concentration of more than 3,000 times, it is prone to phytotoxicity; benziconazole control In the case of rust, powdery mildew, bacterial blight, root rot and other diseases, 10% difenoconazole water dispersible granules are used, and the safe concentration is 1000-1500 times, and the safety interval is maintained for more than 7 days. It should be clear that the dosage of triazole bactericides for inhibiting crop growth is different from the appropriate dose for bactericidal. As long as the relationship between the two is well understood, triazole bactericides can be safely and effectively used.
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