Field survey during 1995–1996 in Shanxi province, China revealed that the rates of parasitism of Aphis gossypii, Myzus persicae, Schizaaphis graminum and Lipaphis erysimi by larvae of Allothrombium ovatum averaged 42.9%, 13.1%, 5.5% and 0.6%, respectively. Among different stages of A. gossypii , alatae were parasitized by more mites (mite load 2–4) than apterae (mite load 1–2). Laboratory choice tests using Ivelev index showed that the preference of larval mites for aphid hosts decreased in the order: A. gossypii (0.2168)> M. persicae (0.1004)> S. graminum (-0.0569) > L. erysimi (-0.5033).
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1 July 1999
Studies on aphid host selection by parasitic larvae of Allothrombium ovatum (Acari: Trombidiidae)
Huijie Zhang,
Jianshe Li,
Yanhua Liang
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Systematic and Applied Acarology
Vol. 4 • No. 1
July 1999
Vol. 4 • No. 1
July 1999
Allothrombium ovatum
aphids
host selection
parasitism