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Experimental & Applied Acarology

, Volume 26, Issue 1–2, pp 27–42 | Cite as

Interactions in a tritrophic acarine predator-prey metapopulation system III: Effects of Tetranychus urticae (Acari: Tetranychidae) on host plant condition

  • Gösta Nachman
  • Rostislav Zemek
Article

Abstract

Spider mites are serious pests on many economically important plant species, because they may reduce plant productivity and, at high mite densities, overexploit and even kill the host plants. We have conducted a series of greenhouse experiments to quantify the effects of two-spotted spider mites (Tetranychus urticae) on host plants (Phaseolusvulgaris). The average amount of chlorophyll per cm2 leaf area was used as a measure of plant condition. It was shown that chlorophyll concentration decreases with plant age and intensity of spider mite feeding. Damage caused by spider mites was assessed visually, using the Leaf Damage Index (LDI) defined by, and a mathematical relationship between the visual measurements and the amount of chlorophyll/cm2 was fitted to data. The relationship may serve as a short-cut to estimate overall plant injury, expressed as the relative loss of chlorophyll/cm2 leaf area caused by spider mites (D). D takes values between 0 (no injury) and 1 (all leaves dead). A highly significant positive relationship between the instantaneous spider mite density and D was found, even though D is expected to reflect the cumulated density of mites (mite-days). A model of plant growth incorporating information about plant age and D predicts that plant area has a maximum when plant age is about 60 days, and that plant area decreases exponentially with an increase in D.

Beans Chlorophyll Injury assessment Leaf damage index LDI Plant condition Tetranychus urticae Two-spotted spider mites 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Gösta Nachman
    • 1
  • Rostislav Zemek
    • 2
  1. 1.Zoological Institute, Department of Population EcologyUniversity of CopenhagenCopenhagen ØDenmark
  2. 2.Institute of Entomology, Branišovská 31České BudějoviceCzech Republic

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