首页> 外文学位 >FOOD WEB RELATIONSHIPS OF GEOCORIS PALLENS STAL AND ORIUS TRISTICOLOR (WHITE) ON COTTON PLANTS. PART I. A COMPARISON OF THREE METHODS FOR DETERMINING ARTHROPOD POPULATION NUMBERS ON COTTON. PART II. ARTHROPODS ON COTTON PLANTS: SEASONAL AND VERTICAL DISTRIBUTION. PART III. EVALUATION OF WESTERN FLOWER THRIPS AND PACIFIC SPIDER MITES AS PREY FOR GEOCORIS PALLENS STAL AND ORIUS TRISTICOLOR (WHITE) ON COTTON.
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FOOD WEB RELATIONSHIPS OF GEOCORIS PALLENS STAL AND ORIUS TRISTICOLOR (WHITE) ON COTTON PLANTS. PART I. A COMPARISON OF THREE METHODS FOR DETERMINING ARTHROPOD POPULATION NUMBERS ON COTTON. PART II. ARTHROPODS ON COTTON PLANTS: SEASONAL AND VERTICAL DISTRIBUTION. PART III. EVALUATION OF WESTERN FLOWER THRIPS AND PACIFIC SPIDER MITES AS PREY FOR GEOCORIS PALLENS STAL AND ORIUS TRISTICOLOR (WHITE) ON COTTON.

机译:棉植物上的乔科里斯·帕伦斯·斯塔尔和ORIUS斜纹夜蛾(白色)的食物网关系。第一部分:三种确定棉花上节肢动物种群数量方法的比较。第二部分棉花植物上的节肢动物:季节和垂直分布。第三部分西部花蓟马和太平洋蜘蛛螨的评估,作为棉花上的乔氏巨螯虾和白骨(白)的猎物。

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This dissertation consists of three studies of arthropod pest-prey relationships on cotton in the San Joaquin Valley of California. The three studies are written separately in manuscript style for publication.; Part I. Major and secondary pest and beneficial arthropod populations were sampled in San Joaquin Valley cotton fields in California. Three methods were compared as measures of arthropod numbers: a visual examination of cotton plants, a modified berlese funnel method, and whole plants collected in cloth bags. Numbers of the several arthropods collected by the three methods are compared with developmental stages separated where possible. No significant differences in the numbers collected by the three methods were detected when arthropod populations were at low densities. No single method was most effective for estimating all life stages of any particular arthropod species. A combination of the bag and berlese funnel methods provided a better estimate for some arthropod populations than the use of bags alone. These methods are suitable for research purposes, but not for scouting programs.; Part II. Seasonal and vertical distribution of arthropods on cotton plants was evaluated by visual inspection of the whole plants in the field. Most arthropods species gradually increased in population density from early to late season and reached highest values on the last week of August about the time of cotton maturity. Beginning in early September most populations drastically decreased. Geocoris pallens Stal decreased about mid-August and mites and thrips continued increasing after August 29. Highly significant regressions were calculated between number of arthropods located on progressively higher main stem nodes and the increase in height of the cotton plant. A majority of the arthropods were found in the upper third of the cotton plant throughout the cotton growing season.; Part III. Western flower thrips, Frankliniella occidentalis (Pergande) and spider mites, Tetranychus pacificus McGregor, are common elements of the cotton field phytophagous fauna. Numerical response and survival was evaluated for the western big-eyed bug Geocoris pallens Stal and the minute pirate bug Orius tristicolor (White) fed on these mites, thrips and on cotton plants. In laboratory and field cage studies increases in numbers of G. pallens were significantly greatest with the pacific spider mite as prey, intermediate with the western flower thrips and lowest when only plants were available. No statistically significant differences at the 5% level were detected in the numerical response of O. tristicolor to the prey provided, although there were consistent patterns of greatest numerical increase with thrips as prey, intermediate with spider mites, and least with the cotton plant as the only source of food.
机译:本论文包括加利福尼亚州圣华金河谷棉花节肢动物害虫与食饵之间关系的三项研究。这三项研究分别以手稿形式撰写,以供出版。第一部分:主要和次要害虫及有益节肢动物种群的采样在加利福尼亚州的圣华金谷棉田中进行。比较了三种方法作为节肢动物数量的度量标准:目视检查棉花植株,改良的贝氏漏斗法和收集在布袋中的整株植株。将通过三种方法收集的几种节肢动物的数量与可能分离的发育阶段进行比较。当节肢动物种群处于低密度时,这三种方法收集的数量没有显着差异。没有一种方法能最有效地估计任何节肢动物物种的所有生命阶段。与仅使用袋子相比,袋子和漏斗式漏斗方法的结合可以更好地估计某些节肢动物的数量。这些方法适合于研究目的,但不适用于侦查程序。第二部分通过目测田间整株植物,评估了节肢动物在棉花上的季节性和垂直分布。从节末到节末,大多数节肢动物种类的种群密度逐渐增加,并在棉花成熟期的八月的最后一周达到最高值。从9月初开始,大多数人口急剧减少。八月中旬,Geocoris pallens Stal减少,螨虫和蓟马继续增加。8月29日以后,节肢动物的数量逐渐增加,主茎节上逐渐增加,节肢动物的数量与棉株的高度增加之间的回归显着。在整个棉花生长季节,大部分节肢动物被发现在棉花上部三分之一的地方。第三部分西方花蓟马,富兰克氏菌(Pergande)和蜘蛛螨(Tetranychus pacificus McGregor)是棉田植食性动物的常见成分。评估了以这些螨虫,蓟马和棉株为食的西部大眼bug Geocoris pallens Stal和小海盗bug Orius tristicolor(White)的数值响应和存活率。在实验室和野外笼研究中,以太平洋红蜘蛛作为猎物,苍白G. gallens的数量增加最大,在西部花蓟马中居中,而在仅有植物的情况下,最低。在三色th对提供的猎物的数值响应中,在5%的水平上未检测到统计学上的显着差异,尽管存在一致的模式,即以蓟马为猎物,以螨虫为中间,以棉株为最低的数字增加最大。唯一的食物来源。

著录项

  • 作者

    GARCIA-ESCOBAR, ALFONSO.;

  • 作者单位

    University of California, Riverside.;

  • 授予单位 University of California, Riverside.;
  • 学科 Biology Entomology.
  • 学位 Ph.D.
  • 年度 1980
  • 页码 216 p.
  • 总页数 216
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 昆虫学;
  • 关键词

  • 入库时间 2022-08-17 11:51:39
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