Laboratory Toxicity and Field Efficacy of Two Environmentally-friendly Pesticides on Helicoverpa armigera (Hübner) in Tobacco Fields
In order to effectively control the Helicoverpa armigera (Hübner) in tobacco fields, the laboratory toxicity of environmentally-friendly pesticides, such as spinosad and emamectin benzoate, to Helicoverpa armigera (Hübner) was determined by leaf dipping feeding method. And its field efficacy on Helicoverpa armigera (Hübner) was confirmed through field efficacy trials. The laboratory toxicity result showed that spinosad and emamectin benzoate had high laboratory toxicity to Helicoverpa armigera (Hübner). The LC50 values at 48 hours after administration were 2.213 and 0.022 mg/L, respectively. The results of field control showed that the field application of Spinosad and Em-amectin benzoate had lower quick effect and higher sustained effect. After 7 days of treatment, with a dosage of 300-375 mL/hm2of 10％ spi-nosad SC, the corrected control effect was 91. 69％-87. 51％, and the corrected control effect of 0. 5％ emamectin benzoate EC 1500-1875 mL/hm2 was 89.57％-88.67％. In total, both pesticides can effectively control the harm of Helicoverpa armigera (Hübner) in tobacco fields.
万方数据
维普
