The growth, development and consumption of successive three generations of cotton bollworm, Helicoverpa armigera （Htibner）, fed on cotton bolls grown under elevated CO2 （double-ambient vs. ambient） in open-top cha...The growth, development and consumption of successive three generations of cotton bollworm, Helicoverpa armigera （Htibner）, fed on cotton bolls grown under elevated CO2 （double-ambient vs. ambient） in open-top chambers were examined. Significant decreases in protein, total amino acid, water and nitrogen content and increases in free fatty acid were observed in cotton bolls. Changes in quality of cotton bolls affected the growth, development and food utilization of H. armigera. Significantly longer larval development duration in three successive generations and lower pupal weight of the second and third generations were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower fecundity was also found in successive three generations of H. armigera fed on cotton bolls grown under elevated CO2. The consumption per larva occurred significant increase in successive three generations and frass per larva were also significantly increased during the second and third generations under elevated CO2. Significantly lower relative growth rate, efficiency of conversion of ingested food and significant higher relative consumption rate in successive three generations were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower potential female fecundity, larval numbers and population consumption were found in the second and third generations of cotton bollworm fed on cotton bolls grown under elevated CO2. The integrative effect of higher larval mortality rate and lower adult fecundity resulted in significant decreases in potential population consumption in the latter two generations. The results show that elevated CO2 adversely affects cotton bolls quality, which indicates the potential population dynamics and potential population consumption of cotton bollworm will alleviate the harm to the plants in the future rising CO2 atmosphere.展开更多
目的:研究生物农药竹醋液在延胡索栽培中的应用。方法:通过田间茎叶喷雾处理试验,比较竹醋液除草剂、草铵膦及除草剂组合的除草效果,并调查其对延胡索叶面积、产量的影响。结果:试验设置各处理组都获得了较好的除草效果,株防效77. 02%～...目的:研究生物农药竹醋液在延胡索栽培中的应用。方法:通过田间茎叶喷雾处理试验,比较竹醋液除草剂、草铵膦及除草剂组合的除草效果,并调查其对延胡索叶面积、产量的影响。结果:试验设置各处理组都获得了较好的除草效果,株防效77. 02%～100%。不同除草剂处理对延胡索叶面积有影响,出苗后16 d,各处理组叶面积显著大于对照组(CK),有显著性差异(P <0. 05);出苗后30 d,草铵膦AS 1500 g a. i.·hm^(-2)处理叶面积大于对照组(CK),有显著性差异(P <0. 05);表明施用除草剂可以促进延胡索叶面积的增长。各除草剂处理组延胡索产量大于对照组(CK),其中草铵膦AS 1500 g a. i.·hm^(-2)处理延胡索产量最大,有显著性差异(P <0. 05)。结论:竹醋液除草剂可以替代草铵膦使用,防除田间杂草,建议施用的剂量为75 L·hm^(-2);草铵膦AS 1500 g a. i.·hm-2处理可以增加延胡索叶面积和产量;竹醋液除草剂和草铵膦混合施用没有表现出明显优势。展开更多
基金Project supported by the National Basic Research Program(973)of China(No.2006CB102002)the Pilot Project of Knowledge Innovation Program of Chinese Academy of Sciences(No.KSCX2-YW-N-006)National Natural Science Foundation of China(No.30571253,30621003)
文摘The growth, development and consumption of successive three generations of cotton bollworm, Helicoverpa armigera （Htibner）, fed on cotton bolls grown under elevated CO2 （double-ambient vs. ambient） in open-top chambers were examined. Significant decreases in protein, total amino acid, water and nitrogen content and increases in free fatty acid were observed in cotton bolls. Changes in quality of cotton bolls affected the growth, development and food utilization of H. armigera. Significantly longer larval development duration in three successive generations and lower pupal weight of the second and third generations were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower fecundity was also found in successive three generations of H. armigera fed on cotton bolls grown under elevated CO2. The consumption per larva occurred significant increase in successive three generations and frass per larva were also significantly increased during the second and third generations under elevated CO2. Significantly lower relative growth rate, efficiency of conversion of ingested food and significant higher relative consumption rate in successive three generations were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower potential female fecundity, larval numbers and population consumption were found in the second and third generations of cotton bollworm fed on cotton bolls grown under elevated CO2. The integrative effect of higher larval mortality rate and lower adult fecundity resulted in significant decreases in potential population consumption in the latter two generations. The results show that elevated CO2 adversely affects cotton bolls quality, which indicates the potential population dynamics and potential population consumption of cotton bollworm will alleviate the harm to the plants in the future rising CO2 atmosphere.
文摘目的:研究生物农药竹醋液在延胡索栽培中的应用。方法:通过田间茎叶喷雾处理试验,比较竹醋液除草剂、草铵膦及除草剂组合的除草效果,并调查其对延胡索叶面积、产量的影响。结果:试验设置各处理组都获得了较好的除草效果,株防效77. 02%～100%。不同除草剂处理对延胡索叶面积有影响,出苗后16 d,各处理组叶面积显著大于对照组(CK),有显著性差异(P <0. 05);出苗后30 d,草铵膦AS 1500 g a. i.·hm^(-2)处理叶面积大于对照组(CK),有显著性差异(P <0. 05);表明施用除草剂可以促进延胡索叶面积的增长。各除草剂处理组延胡索产量大于对照组(CK),其中草铵膦AS 1500 g a. i.·hm^(-2)处理延胡索产量最大,有显著性差异(P <0. 05)。结论:竹醋液除草剂可以替代草铵膦使用,防除田间杂草,建议施用的剂量为75 L·hm^(-2);草铵膦AS 1500 g a. i.·hm-2处理可以增加延胡索叶面积和产量;竹醋液除草剂和草铵膦混合施用没有表现出明显优势。
