| 【Objective】The study was carried out to evaluate the control effect of 5% emamectin benzoate water
dispersible granule (WG) against Lepidoptera pests in field.【Method】Field plot test and five point sampling method
were adopted to investigate and calculate the field control of 5% emamectin benzoate WG against Spodoptera exigua and
Cnaphalocrocis medinalis.【Result】After spraying for 7 d, the control effects of 5% emamectin benzoate WG (active
ingredient, ai) of 7.5 g/hm2
, 12.0 g/hm2
and 15.0 g/hm2
against S. exigua were 82.87%, 89.37% and 91.02%, respectively.
After spraying for 14 d, the control effects of 5% emamectin benzoate WG (ai) of 7.5 g/hm2
, 12.0 g/hm2
and 15.0 g/hm2
against
C. medinalis were 90.32%, 94.20% and 98.03%, respectively. Significant difference analysis results indicated that the 7 d
and 14 d control effects of the 5% emamectin benzoate WG of 12.0 g/hm2
treatment against S. exigua were higher than those of 5.7% emamectin benzoate emulsifiable concentrate (EC) treatment. The 14 d control effect of the 5% emamectin benzoate WG
of 12.0 g/hm2
treatment against C. medinalis was higher than that of 5.7% emamectin benzoate emulsifiable concentrate (EC) .
【Conclusion】The 5% emamectin benzoate WG showed good field control against S. exigua and C. medinalis. Moreover, it
had a long duration, no harm to crops and no adverse effects on beneficial organisms. |
