Analysis of the advantages and methods of use of azole fungicides
The bactericidal mechanism of azole fungicides is basically the same, mainly by inhibiting the biosynthesis of ergosterol in fungi. This article will take you to understand the advantages and methods of using azole fungicides.
Advantages of azole fungicides
(1) It has strong internal absorption conductivity to crops, which can be quickly absorbed by crops and transmitted in the body. The effective period for crop disease prevention and control is generally about 20 days. From the large number of trials and large-scale production applications, these azole fungicides usually have a good control effect on crop diseases at doses lower than those that cause phytotoxicity to crops, and generally do not cause phytotoxicity to crops. After the azole antiseptic agent such as propiconazole is slightly phytotoxic to the crop after overdosing, the growth inhibition effect on the crop is generally maintained for about 7 days, and the crop can gradually resume growth afterwards.
(2) The oxazolol in the azole fungicide has a good control effect on rice sheath blight, and has been widely used in rice. At present, a plurality of single agents of oxazolol and its compounding agent with Jinggangmycin have been used for the control of rice sheath blight, and the recommended dosage of a single dose of a pure drug per acre is generally 4-5 grams. However, it is worth noting that azole fungicides such as diniconazole, tebuconazole, propiconazole, triazolone, and oxazolol have the effect of inhibiting growth, and improper use may cause phytotoxicity in rice production. Because these agents can also inhibit the formation of gibberellin in rice and other crops, thereby inhibiting the growth and development of rice and other crops. When used improperly, it will even strongly inhibit the growth of rice, which will delay the growth process. In severe cases, rice can not be properly headed and firmed.
Method for using azole fungicide
From the characteristics of azole fungicides, they are especially suitable for rice jointing or early jointing. During this period, rice sheath blight is generally in the early stage of the disease, and these agents are used according to normal dose or appropriate dosage, such as rice breakage. It is safe to use 40% triazodone wettable powder 40-50g per acre, or 5% oxazolol 120-125ml per acre. It not only has a good inhibitory effect on rice sheath blight, but also inhibits the lengthening of the stem section of the base and prevents late lodging. Dwarf rice varieties and some japonica rice varieties with slight necking phenomenon have weak gibberellin formation ability. In the upper two sections before heading, they should pay special attention to controlling the amount of azole fungicides. Excessive medication, do not repeat medication in a short period of time, normal use of azole fungicides at reasonable doses, the interval between two medications should be more than 1 week. In the event of phytotoxicity, spray a suitable amount of growth regulator such as gibberellin (920), use 0.2-0.5 g of gibberellin per time, and evenly spray 50 kg of water to quickly relieve the effect and promote rice. Restore growth.
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