Annual weeds in summer corn fields compete with the crop for water, nutrients, and light, and fields with severe weed infestations show significant yield reductions. Herbicide selection for weed control should be based on the target annual weed species and their precise growth stage—S-metolachlor·atrazine 40% SE is registered for the control of annual weeds in summer corn fields.
For annual weeds in summer maize fields, the herbicides used for grass weeds and broadleaf weeds differ, and the application methods also vary between pre-emergence and post-emergence treatments. Soil-residual herbicides should be applied after sowing but before crop emergence, forming a herbicide film over the soil surface. Post-emergence foliar treatments should be directed-sprayed when weeds reach the 3–5 leaf stage and when the crop is relatively safe.
Metolachlor-atrazine 40% SE (suspension-emulsion), Registration No. PD20085943 (subject to the actual label). Applied for control of annual weeds in summer corn fields at 200–250 mL/mu, as a pre-emergence soil spray after sowing and before seedling emergence. Dilute with water and spray uniformly according to the weed spectrum and crop growth stage; take care to avoid spray drift onto the crop.
For stem and leaf herbicide application, lower the nozzle and spray only the weeds, avoiding herbicide drift onto the crop to prevent crop injury. Do not spray on windy days or before rainfall. Dosage varies significantly among different formulations; conduct small-scale trials first before large-scale application. Always refer to the product label for specific instructions.
