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Different varieties of corn do have different sensitivities to certain herbicides, mainly because different types of cultivars have different sensitivities to certain herbicides.
Currently registered for use in corn fields, and the application of the larger area of ​​the sulfonylurea herbicides nicosulfuron, sulfimsulfuron and formylsulfuron, generally only suitable for dentate, half-tooth 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 in the applicable corn varieties, otherwise it is easy to cause phytotoxicity.
Nicosulfuron is also known as Yu Nongle and Cisulfuron. Currently, the nicosulfuron-containing products registered for corn fields include a single agent such as Yu Nong Le (80% nicosulfuron WP) and a compounding agent of nicosulfuron and atrazine 52% nicosulfuron. · Atrazine WP and so on. Maize has good resistance to nicosulfuron, but generally should be in the 3~5 leaf stage of corn, 2~4 leaf stage of grass weed, 3~4 leaf stage of broadleaf weed, and about 5 cm in height of grass When sprayed with stems and leaves, it can prevent annual weeds such as crabgrass, valerian, sedge, and anti-twig. Application of these herbicides before and after the 2 leaf stage of the corn is susceptible to phytotoxicity, may result in temporary chlorosis or mild developmental delay symptoms, but generally recovers rapidly and does not cause a reduction in production. Applying under drought conditions, adding 1% vegetable oil type additives can improve the efficacy. Nicosulfuron can not be mixed with organophosphorus pesticides, and it is necessary to spray at intervals of more than 7 days. Xia Ma Jing Jing 8 is sensitive to nicosulfuron and should not be used.
The sulfomesulfuron product has a 25% sulfensulfuron dry suspension and a mixture of sulfonate and 2, 4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 · Emu oil suspension, 50% sulfonate, èŽ wettable powder, etc. Summer corn fields should be sprayed with stems and leaves when the corn is 3 to 5 leaves, the grass weeds are 2 to 4 leaves, the broadleaf weeds are 3 to 4 leaves, and the grass is about 5 cm. The use of corn after the 6-leaf stage is prone to phytotoxicity and generally recovers after 15 days. Directional spray treatment between rows improves safety. Benyu No. 5 and other varieties are more sensitive to sulfimsulfuron and should not be used.
The formylaminosulfuron product has 35% formylaminosulfuron-methyl dispersible granules. The drug should be sprayed with stems and leaves in the 3 to 5 leaf stage of corn, 2 to 4 leaves of weeds, and 5 cm in height of grass. It can prevent annual weeds such as crabgrass, valerian, and twigs. After application, the maize seedlings may appear temporary whitening and dwarfing, and generally disappear within 14 to 20 days. 1% vegetable oil type auxiliaries should be added to the drug solution when applying under drought conditions.
In addition, herbicides such as atrazine, a soil-blocking agent commonly used in corn fields, sweet corn varieties and some feed corn varieties are also sensitive to them. It is easy to produce phytotoxicity after administration, and attention should be paid to production.
Sweet sorghum cornfield with sulfonylurea herbicide
Some readers have asked that some cornfield herbicide products can not be used on certain corn varieties. Is it because different corn varieties have different sensitivities to these herbicides? What problems should be paid attention to when using these herbicides in production?
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