Before and after rice heading, it is generally the period of occurrence of various pests and diseases. It is necessary to use chemical pesticides to prevent and control. However, in this breeding period, some pesticides are likely to cause phytotoxicity and cause undue losses, and should attract attention.
One, triazolinone. Before heading, rice always suffers from rice blast and bacterial blight, and triadimefon (triadimefon) is commonly used to prevent and control rice. However, if used improperly, rice leaves will be short and severe and cannot be heading.
Second, diniconazole. At the earliest stage of rice heading, commonly used pesticides such as diniconazole, such as 12% dlconazole WP, are used to control rice smut. The agent is over-emulsified, and heading difficulties are likely to occur, or half of the panicles will stop. In the rice break period or in the early stage of breakage, the use of cinnarizin-containing pesticides, such as querazine and loquat, affected the internode growth of the panicle neck of rice, resulting in the phenomenon of “blanketing†and failure of heading.
Third, arsenic preparations. Arsenic preparations are used improperly on rice and are prone to sturdy or declining seed setting rates.
Four, azole fungicides. Use imidazole bactericide with caution before and after rice heading. Bad use will affect heading grouting. Combinations of hexaconazole and jinggangmycin, such as GS, etc., propiconazole, diniconazole, thiadiazole, single agents such as ritrix, loquat, full ear, etc., these drugs generally have a sustained period of validity More than 15 days, it is effective for controlling rice sheath blight. It should be noted that azole drugs such as tebuconazole, diniconazole, hexaconazole, and propiconazole inhibit the formation of gibberellin in rice, and are used for long-term use in the upper internode of rice, especially when used in large quantities. , may inhibit internode extraction, leading to heading difficulties, affecting rice grouting.
Fifth, glyphosate. Misfiring of glyphosate during the booting stage of rice is a major hazard. Inadvertent application of glyphosate to hybrid rice fields can result in failure of normal panicle development in rice fields, with loss of yield between 80% and 100%. Young panicle differentiation is easy to produce phytotoxicity, resulting in the dead heart, young ears and other symptoms.
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