Although the azole fungicide has a good bactericidal effect, it should be used with caution in the special period to prevent the occurrence of phytotoxicity. Pesticide fungicides are sprayed at a certain period of crop growth, in order to prevent and cure various pathogens, and azole fungicides such as triazolone and diniconazole have been widely used in rice production many years ago. Among them, triazolone was widely used in production, and the effect was reduced after many years of use, and the application of the drug was easy to cause phytotoxicity, and the application area was rapidly reduced. Products such as diniconazole were expensive or improper in some areas. After use, it has caused phytotoxicity to rice, and the use area has not been too large. In recent years, due to the serious occurrence of rice sheath blight, the general feeling of the use of Jinggangmycin for poor efficacy in production, azole fungicides began to be widely used in the control of rice sheath blight, and achieved good control. At present, the azole fungicides for controlling rice sheath blight are mainly propiconazole and its compounding agent with difenoconazole, oxazolol, diniconazole, tebuconazole and the like. It is easy to cause a large number of eggs to be laid and increased in value, which may lead to dryness and shedding; aluminum self tapping screws,assorted self tapping screws,black self tapping screws,brass self tapping screws NINGBO TAURUS INDUSTRY CO.,LTD. , https://www.taurushardware.com
The bactericidal mechanism of the above azole fungicides is basically the same, and mainly plays a role by inhibiting the biosynthesis of ergosterol in the fungus. Based on a similar mechanism of action, these pesticide bactericides also inhibit the formation of gibberellin in rice and other crops. To inhibit the growth and development of crops such as rice.
Different azole fungicides have certain inhibitory effects on crop growth. According to the relevant experts of Nanjing Agricultural University, seed treatment with several azole fungicides at the same concentration, the growth inhibition of rice leaf area after 12 days of emergence was as follows: imazalil 15%, triazolol 16%, propane ring Azole 20%, triazolone 22%, chloropyrimidin 23%, ethiazole 27%, benzyl chlorotriazole 28%, diniconazole 45%. Among them, the inhibitory effect of diniconazole and other drugs is strong, and the inhibitory effects of propiconazole and triazolone are weak. According to other reports, tebuconazole has a stronger inhibitory effect on crop growth, which is similar to diniconazole. The inhibitory effect of hexaconol on crops is slightly weaker than that of propiconazole and triadimefon. The inhibitory effect of difenoconazole on crops is weaker than oxazolol.
The above-mentioned azole fungicides such as benzepazole, difenoconazole, oxazolol, diniconazole, tebuconazole and triazolone have strong systemic conductivity and can be quickly absorbed by crops and In vivo conduction, for the prevention and treatment of crop diseases, the effective period is generally about 20 days. From the large number of experiments and large-scale production applications, these azole pesticide fungicides usually have a good control effect on crop diseases at doses lower than the pesticides produced on crops. Normal use according to the recommended recommended dose, generally not Crops produce phytotoxicity. It has been reported that the inhibitory effect on the growth of crops is usually only about 7 days after the improper use of azoles and other azole fungicides on crops, and can be gradually recovered later.
From the characteristics of azole pesticide bactericides, they are particularly suitable for use before rice jointing or early jointing. During this period, rice sheath blight is generally in the early stage of the disease. These agents are used at normal doses or in appropriate dosages, which not only have good control effect on sheath blight, but also inhibit the elongation of the base internodes and prevent late lodging, while on rice. Heading generally has no adverse effects. In the upper part of the rice, the long-term extension of the three long sections, even if using diniconazole, tebuconol and other agents that inhibit growth, as long as the attention is not over-medicated or repeated in the short-term, usually does not affect the normal heading of rice. And strong.
Dwarf rice varieties and some japonica rice varieties with slight necking phenomenon have weaker gibberellin synthesis ability. In the upper two sections before heading, the special amount of azole fungicide should be controlled. Excessive medication, do not repeat medication in the short term. A single dose of the azole fungicide is normally used according to the recommended dosage, and the interval between the two medications should be more than one week.
Use caution during high temperature and high humidity environments.
Do not use azole fungicides before heading rice