RESPONSE OF HELICOVERPA-ZEA (LEPIDOPTERA, NOCTUIDAE) POPULATIONS TO CANOPY DEVELOPMENT IN SOYBEAN AS INFLUENCED BY HETERODERA-GLYCINES (NEMATODA, HETERODERIDAE) AND ANNUAL WEED POPULATION-DENSITIES
RESPONSE OF HELICOVERPA-ZEA (LEPIDOPTERA, NOCTUIDAE) POPULATIONS TO CANOPY DEVELOPMENT IN SOYBEAN AS INFLUENCED BY HETERODERA-GLYCINES (NEMATODA, HETERODERIDAE) AND ANNUAL WEED POPULATION-DENSITIES
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DOI：
10.1093/jee/84.1.267
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发表时间：
1991-02-01
影响因子：
2.2
通讯作者：
COBLE, HD
中科院分区：
文献类型：
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作者：
ALSTON, DG;BRADLEY, JR;COBLE, HD
通过田间试验，研究了玉米穗虫Helicoverpa zea(Boddie)、大豆胞囊线虫Heterodera Glycines Ichinohe和大豆一年生杂草(Glycinmax(L.)美林)于1986-1988年在北卡罗来纳州东部进行。本研究探讨了大豆冠层发育对玉米象产卵和幼虫建立的影响，以及甘氨酸和杂草密度的影响。大豆冠层发育与大豆根结线虫初始种群密度(P(I))呈负相关。总体而言，在8月中下旬，与关闭大豆冠层的0和低H.Glycine P(I)处理相比，中、高H.Glycine P(I)处理的大豆有更多的开放冠层，因此有更多的H.zea幼虫种群。在一些田间地点，极高的甘氨酸P(I)水平导致严重的发育迟缓和黄化，降低了这些大豆作为玉米赤霉菌幼虫食物来源的适宜性。无杂草和中等杂草的大豆比高杂草密度的大豆有更多的玉米象幼虫。在不同的地点和年份，棉铃虫的早期发育阶段(卵和早期幼虫)的数量不受甜菜夜蛾P(I)或杂草密度的影响。玉米晚龄数与相邻行冠层间距离呈正相关。
Field experiments to investigate the interactive effects among corn earworm, Helicoverpa zea (Boddie); soybean cyst nematode, Heterodera glycines Ichinohe; and annual weed species in soybean (Glycine max (L.) Merrill) were conducted during 1986-1988 in eastern North Carolina. This study examined the effects of canopy development in soybean on H.zea oviposition and larval establishment as influenced by H. glycines and weed densities. Soybean canopy development was inversely related to increasing initial population density (P(i)) of H. glycines. In general, soybeans with moderate and high H. glycines P(i) levels had more open canopies and consequently had greater H. zea larval populations during mid-to late August than did the 0 and low H. glycines P(i) treatments where soybean canopies were closed. In some field sites, very high H. glycines P(i) levels caused severe stunting and chlorosis, reducing the suitability of these soybeans as a food source for H. zea larvae. Weed-free and moderately weedy soybeans had greater H. zea larval populations than soybeans with high weed densities. Across locations and years, numbers of early developmental stages (egg and early instars) of H. zea were not influenced by H. glycines P(i) or weed density. Number of H. zea late instars were positively correlated with distance between canopies of adjacent rows.