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首页> 外文期刊>The Kasetsart Journal >Spatial Dispersion and Optimum Sample Size for Cotton Bollworm, Helicoverpa armigera (Huebner) (Lepidoptera: Noctuidae) Larvae on Cotton
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Spatial Dispersion and Optimum Sample Size for Cotton Bollworm, Helicoverpa armigera (Huebner) (Lepidoptera: Noctuidae) Larvae on Cotton

机译：棉铃虫棉铃虫（Huebner）（鳞翅目：夜蛾科）幼虫在棉上的空间分布和最佳样本量

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摘要

Field experiments were conducted in the irrigated and the rain-fed crops of 2000 and 2001 at Suwan Farm, Pak Chong, Nakon Ratchasima, Northeastern Thailand to determine the spatial dispersion of cotton bollworm, Helicoverpa armigera (Huebner) larvae on four cotton varieties/lines, namely, AP1 and AP2, the mutant lines, SR60 (Sri Samrong 60) and SD1 (Sarid1), the recommended varieties. RCB was used with four replicates for both crops. The spatial dispersion was analyzed using the variance-to-mean ratio (s~2/ x), Morisita's Index (I_δ) and the negative binomial parameter (k). Although cotton bollworm larvae exhibited mainly clumped distribution, sometimes it was found to be randomly disperse during the sampling periods of both crops. In general, H. armigera larvae were at high aggregation (k=0.10) on the irrigated crop and low aggregation (k=3.92) on the rain-fed crop. The dispersion information was used to select an optimum sample size at the 0.05 probability. The optimum sample size of 15 and 30 plants per 140 m~2 were needed to monitor low and high aggregation levels of H. armigera larvae, respectively.
机译：在泰国东北部Nakon Ratchasima的北冲县苏旺农场的2000年和2001年的灌溉作物和雨养作物上进行了田间试验，以确定棉铃虫，棉铃虫（Helicoverpa armigera（Huebner））幼虫在四种棉花品种/品系上的空间分布推荐品种，即AP1和AP2，即SR60（Sri Samrong 60）和SD1（Sarid1）。两种作物均使用RCB进行四次重复。使用方差均值比（s〜2 / x），森成指数（I_δ）和负二项式参数（k）分析空间色散。尽管棉铃虫的幼虫主要呈团簇状分布，但有时在两种农作物的采样期间发现它是随机散布的。通常，在灌溉作物上，棉铃虫幼虫处于高聚集状态（k = 0.10），而在雨养作物上处于低聚集状态（k = 3.92）。使用离散度信息以0.05的概率选择最佳样本大小。每140 m〜2需要15和30株植物的最佳样本量，以分别监测棉铃虫幼虫的低和高聚集水平。

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