[ Objective] The paper was to screen out ideal biological pesticides, in order to provide guidance for pollution-free control against Pieris rapae Linne. [Method] Taking Chinese cabbage variety Taiyuan Erqing as the t...[ Objective] The paper was to screen out ideal biological pesticides, in order to provide guidance for pollution-free control against Pieris rapae Linne. [Method] Taking Chinese cabbage variety Taiyuan Erqing as the test material, the field control efficiencies of four pesticides including PrGV · Bt WP 1 000 times dilution, NPV · Bt SC 750 times dilution, 0.5% azadirachtin EC 750 times dilution, and 0.3% matrine AS 500 times dilution against P. rapae were studied, and their impacts on yield and planting benefits of Chinese cabbage were also determined. Using foliar spray method, the pesticides were sprayed for the first time when the second or third instar larvae of P. rapae first occurred in fields, and sprayed for the second time with the interval of 15 d. The fields sprayed with beta-cypermethrin EC （organic chemical pesticide） and water were set as control. [ Result] NPV · Bt SC 750 times dilution had the best effect after spraying for two times： the control efficiency against P. rapae at 15 d after spraying was 90.11% ; the damage rate of Chinese cabbage was only 0.21%, while the commodity rate reached 100% ; compared with chemical pesticide spraying, the commodity yield （177 262.5 kg/hm2 ） and the income after deducting spraying cost （48 858.5 yuan/hm2 ） were increased by 14.7% and 13.75%, respectively. [ Conclusion] Although biological pesticides are more expensive, they have long persistence and good control effect, resulting in green and safe Chinese cabbage with high commodity rate and yield, and higher eventual economic benefit after deducting spraying cost.展开更多
为明确不同生物农药对白菜菜青虫的田间防治效果，以白菜品种太原二青为试材，采用叶面喷雾的方法，在田间初见2～3龄菜青虫幼虫时进行第1次施药、间隔15 d 进行第2次施药，以高效氯氰菊酯乳油（有机化学农药）1500倍液和清水（不施药...为明确不同生物农药对白菜菜青虫的田间防治效果，以白菜品种太原二青为试材，采用叶面喷雾的方法，在田间初见2～3龄菜青虫幼虫时进行第1次施药、间隔15 d 进行第2次施药，以高效氯氰菊酯乳油（有机化学农药）1500倍液和清水（不施药）为对照，研究了菜颗·云金杆菌可湿性粉剂1000倍液、苜核·苏云金杆菌悬浮剂750倍液、0.5％印楝素乳油750倍液、0.3％苦参碱水剂500倍液4种生物农药对菜青虫的田间防治效果以及对大白菜商品产量和种植收益的影响。结果表明：施用生物农药持效期长、防治效果好，虽然增加了购药成本，但生产出的白菜商品率和产量均高且绿色安全，最终扣除施药成本后的经济效益较高。本研究施药2次条件下，施用苜核·苏云金杆菌悬浮剂750倍液对菜青虫的防治效果最好，施药后第15 d防效为90.11％，白菜被害指数仅0.21％、商品率达100％，商品产量（177262.5 kg/hm2）和扣除施药成本后的收入（48858.5元/hm2）均最高，较施用化学农药产量增加14.47％、收入提高13.75％。展开更多
基金Supported by Science and Technology Research and Development Program of Chengde City in 2011(201121167)
文摘[ Objective] The paper was to screen out ideal biological pesticides, in order to provide guidance for pollution-free control against Pieris rapae Linne. [Method] Taking Chinese cabbage variety Taiyuan Erqing as the test material, the field control efficiencies of four pesticides including PrGV · Bt WP 1 000 times dilution, NPV · Bt SC 750 times dilution, 0.5% azadirachtin EC 750 times dilution, and 0.3% matrine AS 500 times dilution against P. rapae were studied, and their impacts on yield and planting benefits of Chinese cabbage were also determined. Using foliar spray method, the pesticides were sprayed for the first time when the second or third instar larvae of P. rapae first occurred in fields, and sprayed for the second time with the interval of 15 d. The fields sprayed with beta-cypermethrin EC （organic chemical pesticide） and water were set as control. [ Result] NPV · Bt SC 750 times dilution had the best effect after spraying for two times： the control efficiency against P. rapae at 15 d after spraying was 90.11% ; the damage rate of Chinese cabbage was only 0.21%, while the commodity rate reached 100% ; compared with chemical pesticide spraying, the commodity yield （177 262.5 kg/hm2 ） and the income after deducting spraying cost （48 858.5 yuan/hm2 ） were increased by 14.7% and 13.75%, respectively. [ Conclusion] Although biological pesticides are more expensive, they have long persistence and good control effect, resulting in green and safe Chinese cabbage with high commodity rate and yield, and higher eventual economic benefit after deducting spraying cost.
文摘为明确不同生物农药对白菜菜青虫的田间防治效果，以白菜品种太原二青为试材，采用叶面喷雾的方法，在田间初见2～3龄菜青虫幼虫时进行第1次施药、间隔15 d 进行第2次施药，以高效氯氰菊酯乳油（有机化学农药）1500倍液和清水（不施药）为对照，研究了菜颗·云金杆菌可湿性粉剂1000倍液、苜核·苏云金杆菌悬浮剂750倍液、0.5％印楝素乳油750倍液、0.3％苦参碱水剂500倍液4种生物农药对菜青虫的田间防治效果以及对大白菜商品产量和种植收益的影响。结果表明：施用生物农药持效期长、防治效果好，虽然增加了购药成本，但生产出的白菜商品率和产量均高且绿色安全，最终扣除施药成本后的经济效益较高。本研究施药2次条件下，施用苜核·苏云金杆菌悬浮剂750倍液对菜青虫的防治效果最好，施药后第15 d防效为90.11％，白菜被害指数仅0.21％、商品率达100％，商品产量（177262.5 kg/hm2）和扣除施药成本后的收入（48858.5元/hm2）均最高，较施用化学农药产量增加14.47％、收入提高13.75％。
