Before and after rice heading, there are generally a variety of pests and diseases. It is necessary to use chemical pesticides to control them. However, during this growth period, some pesticides are easy to cause phytotoxicity, causing undue losses and should be noted.
I. Triazolone. Before rice heading, there are often rice blast and white leaf blight hazards, which are commonly used to control triadimefon (pust rust), but improper use can lead to short and severe heading of rice leaves.
2. Ixazole alcohol. In the early stage of rice heading, pesticides such as diniconazole, such as 12% carbazole WP, are used to control rice false smut, and the drug is excessive, which is prone to heading difficulty, or the stalk is half stopped. After the use of diniconazole-containing pesticides such as Qujingxing and Heguoli in the rice breaching stage or the beginning of the heading, the growth of the internodes of rice was affected, and the phenomenon of “necking†appeared , and the heading could not be performed normally.
Third, arsenic preparations. Improper use of arsenic preparations on rice is prone to imperfections or a decrease in seed set rate.
Fourth, azole fungicides. Use imidazole fungicides before and after rice heading. If it is not used well, it will affect the heading grouting. The compounding agent of oxazolol and Jinggangmycin, such as Wensu, etc., propiconazole, diniconazole, thiofuramide single agent, such as enemy force, Heguoli, Manchu, etc., the effective period of these drugs can generally reach More than 15 days, it is effective for controlling rice sheath blight. It should be noted that azoles, oxazolol, oxazolol, propiconazole and other azole fungicides can inhibit the formation of gibberellin in rice, and use it in the upper part of rice for long-term use, especially when used in large quantities. It may inhibit the lengthening of the internodes, resulting in difficulty in heading and affecting rice filling and fruiting.
Five, glyphosate. It is a great hazard to spray glyphosate at the booting stage of rice. Misapplication of glyphosate into hybrid rice fields can result in the failure of normal paddying of rice fields and yield loss of 80-100% . The differentiation site of young spikes is prone to phytotoxicity, causing symptoms such as dead heart and abnormal ear.
Source: Rural News
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