Annual grass weeds in summer soybean fields compete with the crop for water, nutrients, and light, and severely infested fields show significant yield losses. Herbicide selection for controlling these weeds should be based on the target annual grass weed species and their precise growth stage—quizalofop-p-ethyl 5% EC is registered for the control of annual grass weeds in summer soybean fields.
For annual weeds in summer soybean fields, the herbicides used for grasses 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 to form a herbicide film over the soil surface. For post-emergence foliar treatments, targeted spraying should be conducted when weeds are at the 3–5 leaf stage and when the crop is relatively safe.
Quizalofop-ethyl 5% Quizalofop-ethyl EC, Registration No. PD20091656 (subject to the actual label). Used for the control of annual grass weeds in summer soybean fields, at 50–70 mL/mu, by foliar spray. Dilute with water according to the weed spectrum and crop growth stage, and spray uniformly, taking care to avoid spray drift onto the crop.
For stem and leaf herbicide application, lower the nozzle and spray only the weeds, avoiding spray drift onto the crop to prevent crop injury. Do not spray on windy days or before rainfall. Dosage varies considerably among different formulations; conduct a small-scale trial first before large-scale application. Always follow the label instructions.
