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【目的】作为西洋参Panax quinquefolium L.的新害虫,似士维螨Schwiebea similis Manson蛀食参根,造成较大的经济损失。本研究旨在测定它对参根的取食量,进而为估算其经济阈值提供参数。【方法】本实验将似士维螨活雌螨接种于含湿沙和西洋参根粉的培养皿中塑料环内,在7级雌螨接种量N_0(每环1,2,3,4,5,6和7♀)和5个温阶T(15.6,18.5,21.2,24.5和27.2℃)条件下培养其实验种群,记载并分析了5类变量:安居期D、峰螨数N_p、雌均殖数PCR、成虫当量AE和均食量FA。【结果】变量D随T升高而快速下降,也因N_0增加而缓慢下降;N_p随N_0增加而显著上升,其回归式为N_p=21.8+17.2N_0;PCR随N_0增加而显著下降,PCR=63.4-28.1N_0+6.2N_0~2-0.4N_0~3,其曲线变化趋势与N_p相反;同时发现了螨虫拥挤效应;AE随N_0增加而显著上升,AE=16.2+12.7N_0;FA=0.25±0.13 mg/头。【结论】这5类变量较为全面地反映了似士维螨实验种群的食量范围和繁殖潜势。上述估算值将为探索其经济阈值提供依据;所用实验方法将为同类研究提供参考。
【Aim】 As a new pest of Panax quinquefolium L., Schwiebea similis Manson takes root of ginseng root, causing great economic loss. The purpose of this study was to determine the amount of ginseng fed on it and to provide parameters for estimating its economic threshold. 【Method】 In this experiment, live mite mites were inoculated into the plastic rings containing peat and American ginseng root powder in the plastic rings of the seventh grade female mite inoculation amount N0 (each ring 1,2,3,4,5 , 6 and 7♀) and 5 tem peratures (15.6, 18.5, 21.2, 24.5 and 27.2 ℃). Five variables were recorded and analyzed: PCR, adult equivalent AE and food intake FA. 【Result】 The result showed that the variable D decreased rapidly with the increase of T and decreased slowly with the increase of N_0. N_p increased significantly with the increase of N_0. The regression equation was Np = 21.8 + 17.2N_0. PCR decreased significantly with increase of N_0. PCR = 63.4-28.1N_0 + 6.2N_0 ~ 2-0.4N_0 ~ 3, the trend of which is opposite to that of N_p. At the same time, the crowding effect of mites was found. AE increased with the increase of N_0, AE = 16.2 + 12.7N_0 and FA = 0.25 ± 0.13 mg / head. 【Conclusion】 These five kinds of variables reflect the range of food intake and reproductive potential of the experimental population of G. mites more comprehensively. The above estimate will provide the basis for exploring its economic threshold; the experimental method used will provide reference for similar research.