Document Detail

Leaf pubescence mediates the abundance of non-prey food and the density of the predatory mite Typhlodromus pyri.
MedLine Citation:
PMID:  14635808     Owner:  NLM     Status:  MEDLINE    
Plants with leaves having numerous trichomes or domatia frequently harbor greater numbers of phytoseiid mites than do plant with leaves that lack these structures. We tested the hypothesis that this pattern occurs, in part, with Typhlodromus pyri because trichomes increase the capture of pollen or fungal spores that serve as alternative food. Using a common garden orchard, we found that apple varieties with trichome-rich leaves had 2-3 times more pollen and fungal spores compared to varieties with trichome-sparse leaves. We also studied the effects of leaf trichome density and pollen augmentation on T. pyri abundance to test the hypothesis that leaf trichomes mediate pollen and fungal spore capture and retention and thereby influence phytoseiid numbers. Cattail pollen (Typha sp.) was applied weekly to mature 'McIntosh' and 'Red Delicious' trees grown in an orchard and, in a separate experiment, to potted trees of the same varieties. 'McIntosh' trees have leaves with many trichomes whereas leaves on the 'Red Delicious' trees have roughly half as many trichomes. With both field-grown and potted trees, adding cattail pollen to 'Red Delicious' trees increased T. pyri numbers compared to 'Red Delicious' trees without pollen augmentation. In contrast, cattail pollen augmentation had no effect on T. pyri populations on 'McIntosh' trees. Augmentation with cattail pollen most likely supplemented a lower supply of naturally available alternative food on 'Red Delicous' leaves and thereby enhanced predator abundance. These studies indicate that larger populations of T. pyri on pubescent plants are due, in part, to the increased capture and retention of pollen and fungal spores that serve as alternative foods.
A Roda; J Nyrop; G English-Loeb
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Experimental & applied acarology     Volume:  29     ISSN:  0168-8162     ISO Abbreviation:  Exp. Appl. Acarol.     Publication Date:  2003  
Date Detail:
Created Date:  2003-11-25     Completed Date:  2004-01-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8507436     Medline TA:  Exp Appl Acarol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  193-211     Citation Subset:  IM    
Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Winzerlaer Strasse 10, Beutenberg Campus, Jena, D-07745, Germany.
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MeSH Terms
Malus / anatomy & histology*,  microbiology,  parasitology
Mite Infestations*
Mites / growth & development*
Plant Leaves / anatomy & histology*,  metabolism,  parasitology
Spores, Fungal / growth & development

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