Sodium sulfonylurea herbicides in sweet corn fields

Some readers have asked, some corn field herbicide products can not be used on certain corn varieties. Is it because different corn varieties have different susceptibility to these herbicides and what problems should be paid attention to when using these herbicides in production? Different varieties of corn have different susceptibility to certain herbicides, mainly because different varieties have different sensitivities to certain herbicides. Currently registered for use in corn fields, and the use of larger sulfonylurea herbicides, nicosulfuron, sulfosulfuron, and methylsulfamelonon, are generally applied only to dents and half dents Type, hard grain corn, not recommended for waxy corn, sweet corn, popcorn and various types of inbred corn. In addition, these herbicides should also be applied according to their respective application requirements on applicable corn varieties, otherwise it is easy to produce phytotoxicity. Nicosulfuron is also known as Jade, Lefusol. The Nicosulfuron products currently registered for use in corn fields include Yulonong (80% Nicosulfuron WP), and Nicosulfuron and Atrazine 52% Nicosulfuron. Atrazine WP etc. Corn has good resistance to nicosulfuron, but it should generally be in the 3 to 5 leaf stage of maize, 2 to 4 leaf stage of grasses, 3 to 4 leaf stage of broadleaf weeds, and 5 cm of grass height. When the spray is applied to the stems and leaves, it can prevent annual weeds such as crabgrass, barnyardgrass, sedges and amaranthus. Application of these herbicides before and after the 2-leaf stage of maize is prone to phytotoxicity, may be transiently chlorotic or mildly retarded, but generally can be rapidly restored without causing loss of yield. Application of pesticides under conditions of drought, plus 1% vegetable oil type adjuvant can improve the efficacy. Nicosulfuron can not be mixed with organophosphorus pesticides, spraying more than 7 days. Summer corn Jing 8 is more sensitive to nicosulfuron and should not be used. The sulfosulfuron-methyl product has 25% sulfosulfuron-methyl dry suspension and sulfosulfuron-methyl and 2 methyl 4-chlorosodium, atrazine complex 75.5% 2 sodium methylsulfate WP, 19.5% sulfone Oil suspending agent, 50% sulfopyrazine wettable powder, etc. Summer corn field should be in the corn 3 to 5 leaf stage, gramineous weeds 2 to 4 leaf stage, broadleaf weeds 3 to 4 leaf stage, grass height 5 cm when the stems and leaves spray treatment. The use of corn is likely to produce phytotoxicity after the 6-leaf period, and generally can be restored after 15 days. Inter-row directional spray treatment improves safety. Benyu 5 and other varieties are more sensitive to rimsulfuron and should not be used. The formamisulfuron-methyl product has 35% formamisulfuron-methyl water dispersible granules. The drug should be sprayed on stems and leaves in the 3 to 5 leaf stage of corn, 2 to 4 leaf stage of weeds, and about 5 cm in height of grass. It can prevent annual weeds such as crabgrass, barnyardgrass and amaranthus retroflexus. After application, maize seedlings may show temporary whitening and dwarfing, and usually disappear within 14 to 20 days. The application of 1% vegetable oil type auxiliaries should be added to the drug solution when applied under drought conditions. In addition, herbicides such as atrazine (atrazine), which is commonly used as a soil treatment agent in corn fields, are also sensitive to sweet corn and some feed corn varieties, and they are prone to produce phytotoxicity after application, which requires attention in production.

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