Hough-Goldstein J, McPherson D
Delaware Agricultural Experiment Station, Department of Entomology and Applied Ecology, College of Agricultural Sciences, University of Delaware, Newark 19717-1303, USA.
J Econ Entomol. 1996 Oct;89(5):1116-23. doi: 10.1093/jee/89.5.1116.
In laboratory and microplot consumption tests, spined soldier bug, Podisus maculiventris (Say), ate at least as many Colorado potato beetle, Leptinotarsa decemlineata (Say), eggs and larvae as did the twospotted stink bug, Perillus bioculatus (F.). P. maculiventris also remained in field microplots infected with Colorado potato beetle egg masses for slightly longer than did P. bioculatus. The 2 predators were equally effective at consuming egg masses, reducing densities of beetle larvae, and preventing potato defoliation in small field plots. These results contrast with previous trials, in which P. bioculatus had been more effective. In laboratory trials, larger P. maculiventris nymphs selected larger prey larvae, whereas P. bioculatus nymphs did not discriminate by size of prey; thus, the relative effectiveness of the 2 predators may depend on the life stages of the prey that are present at the time of predator release.
在实验室和微型小区消耗试验中，刺肩蝽（Podisus maculiventris (Say)）取食的科罗拉多马铃薯甲虫（Leptinotarsa decemlineata (Say)）卵和幼虫数量至少与双斑大草蛉（Perillus bioculatus (F.)）一样多。刺肩蝽在感染了科罗拉多马铃薯甲虫卵块的田间微型小区中停留的时间也比双斑大草蛉略长。这两种捕食者在消耗卵块、降低甲虫幼虫密度以及防止小块田地中马铃薯落叶方面同样有效。这些结果与之前的试验形成对比，在之前的试验中双斑大草蛉更有效。在实验室试验中，体型较大的刺肩蝽若虫会选择体型较大的猎物幼虫，而双斑大草蛉若虫不会根据猎物大小进行区分；因此，这两种捕食者的相对有效性可能取决于释放捕食者时猎物所处的生命阶段。
