Bt棉不同性状及杀虫剂对玉米Helicoverpa zea(鳞翅目:夜蛾科)幼虫在植株内分布及受损花结构的影响

IF 0.7 Q4 AGRICULTURAL ENGINEERING Journal of cotton science Pub Date : 2020-01-01 DOI:10.56454/huoe5710
D. Kerns, D. Kerns, G. Lorenz, Angus L. Catchot Jr., S. Stewart
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引用次数: 0

摘要

已有研究表明,苏云金芽孢杆菌(Bacillus thuringiensis, Bt)杀虫蛋白在棉花中的表达对棉铃虫幼虫(Helicoverpa zea,鳞翅目:夜蛾科)的行为有显著影响。这表明,在确定棉铃虫最理想的侦察方法时,可能需要考虑棉花品种产生的特定Bt蛋白。种植NonBt、WideStrike(生产Cry1Ac + Cry1F Bt杀虫蛋白)和Bollgard II (Cry1Ac + Cry2Ab)棉花品种,用杀虫剂处理或不处理。根据玉米蚜幼虫在冠层的分布位置和花结构类型,记录其摄食伤害情况。结果表明,不同棉花品种间幼虫和害虫的分布差异不显著,杀虫剂处理对幼虫和害虫的分布影响最小。幼虫的大小通常与冠层的位置有关,这表明随着年龄的增长,幼虫倾向于向冠层的中间移动。不同的Bt棉花技术的效果似乎与幼虫移动到首选取食地点的速度有关,而不是它们对特定取食地点的偏好。这些结果表明,侦察方法可以独立于Bt棉花性状的存在或以前的杀虫剂施用而标准化。将侦察工作集中在冠层中部(即节点6-9)应该增加对小幼虫和“新鲜”伤害的检测,并且较少受以前施用杀虫剂的影响。
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Impact of Various Bt Cotton Traits and the Application of an Insecticide on the Within Plant Distribution of Helicoverpa zea (Lepidoptera: Noctuidae) Larvae and Injured Floral Structures
Previous studies have indicated that the expression of insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) in cotton can have a significant influence on the behavior of bollworm larvae (Helicoverpa zea, Lepidoptera:Noctuidae). This suggests that the particular Bt protein produced by a cotton variety may need to be considered when determining the most ideal scouting methods to utilize for bollworm. NonBt, WideStrike (producing Cry1Ac + Cry1F Bt insecticidal proteins), and Bollgard II (Cry1Ac + Cry2Ab) cotton varieties were planted and either treated with an insecticide or left untreated. The presence of H. zea larvae and their feeding injury were recorded according to their location in the canopy and type of floral structure where they were found. Results from comparison of larval and injury distributions indicated no significant differences between the different cotton varieties tested, and that insecticide treatment had minimal impact on this distribution. Larval size was generally associated with location in the canopy, suggesting that larvae tend to move towards the middle of the canopy as they age. The effect of different Bt cotton technologies appears to associate with how quickly larvae move to preferred feeding sites rather than their preference for particular feeding sites. These results suggest that scouting methods could be standardized independently of the presence of a Bt cotton trait or previous insecticide application. Focusing scouting efforts on the middle portion of the canopy (i.e., nodes 6-9) should increase the detection of small larvae and ‘fresh’ injury and be less influenced by previous insecticide applications.
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来源期刊
Journal of cotton science
Journal of cotton science AGRICULTURAL ENGINEERING-
CiteScore
0.90
自引率
20.00%
发文量
0
期刊介绍: The multidisciplinary, refereed journal contains articles that improve our understanding of cotton science. Publications may be compilations of original research, syntheses, reviews, or notes on original research or new techniques or equipment.
期刊最新文献
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