不同栽培措施和药剂对油菜茎象甲防治效果及对油菜的影响

研究不同栽培措施和7种药剂对油菜茎象甲防治效果及对油菜农艺和产量性状的影响。结果表明,初春漫灌浇水一次在田间应用和小区试验中对茎象甲成虫的防治效果分别为18.09%和19.91%,为害株率比对照CK分别降低30.37%和32.11%,浇水施肥处理试验组油菜株高比CK提高76.84%,含油量提高2.9百分点,单株产量比对照提高37.7%;25%甲维·氯虫苯EC 150 g/hm~2处理对茎象甲成虫防治效果最高,达85.45%,为害株率比CK降低75.8%,其次为20%氯虫苯甲酰胺SC 150 g/hm~2,防治效果达到80.21%,两种药剂处理可使油菜农艺性状株高、分枝部位、一次分枝数、主花序长比对照显著提高,一次分枝长度则显著降低,单株产量分别比对照提高47.16%和36.76%,含油量分别提高2.63和2.93百分点;其他药剂处理对油菜茎象甲成虫防治效果在49.69%～69.23%之间,防治效果较差。

Effect of different cultivation measures and pesticides on rapeseed growth andcontrol efficacy against rapeseed stem weevil

This study aims to investigate the effect of different cultivation measures and seven insecticides on the control of rapeseed stem weevil and the agronomic and yield traits of rapeseed. The results showed that the control efficacy of flood irrigation on stem weevil adults in field trials and plot experiments were 18.09% and 19.91%, respectively, and the rates of damaged plants were reduced by 30.37% and 32.11%, respectively, compared to CK. Rape plant height in flood irrigation with fertilization application was increased by 76.84%, the oil content was increased by 2.9 percentage points, and the yield per plant was 37.7% higher than the control. The stem weevil control effect of chlorantraniliprole·emamectin 25% EC at the dose of 150 g/hm2 was 85.45% and the damaged plants rate was reduced by 75.8%. The control efficacy of 20% chlorantraniliprole SC at 150 g/hm2 was 80.21%. The rape agronomic traits of plant height, including branch height, first branch number and the length of the main inflorescence, were significantly improved by the two insecticides treatments, while the length of the first branch was decreased. The yield per plant was increased by 47.16% and 36.76%, and the oil content increased by 2.63 and 2.93 percentage points, respectively. Other insecticides had lower control efficacy on rape stem weevil, with the efficacy of 49.69%-69.23%.