Document Detail

Pre-adult development of Phytoseiulus persimilis on diets of Tetranychus urticae and Tetranychus lintearius: implications for the biological control of Ulex europaeus.
MedLine Citation:
PMID:  18923915     Owner:  NLM     Status:  MEDLINE    
Predation by the phytoseiid mite, Phytoseiulus persimilis, is considered a major threat to the effectiveness of biological control of gorse, Ulex europaeus, using Tetranychus lintearius. To assess this threat and to determine if the impact of P. persimilis on T. lintearius populations is comparable to its impact on T. urticae populations, its development and predator : prey generation time ratios were assessed. The pre-adult mortality and development time of two populations of P. persimilis fed on two diets, T. urticae and T. lintearius, were determined at two temperatures, 14 and 24 degrees C. There were no significant differences in either mortality or development time between the two populations of P. persimilis at these temperatures. There is therefore no evidence that the two tested populations of P. persimilis are behaving as different strains. Similarly, diet had no significant effect on either mortality or development time at these temperatures. At 14 degrees C the mortality of P. persimilis was significantly higher and development was significantly longer than at 24 degrees C. Using pre-adult development as a surrogate for generation times, predator : prey generation time ratios were calculated between P. persimilis and both T. urticae and T. lintearius using data from this and other studies. The predator : prey generation time ratios between P. persimilis and T. lintearius were lower than those between P. persimilis and T. urticae. These results indicate that the impact of P. persimilis on T. lintearius populations is likely to be comparable to its impact on T. urticae populations. This provides further evidence that predation by P. persimilis is having a deleterious effect on T. lintearius populations and therefore reducing its effectiveness as a biological control agent for gorse.
Jamie T Davies; John E Ireson; Geoff R Allen
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-16
Journal Detail:
Title:  Experimental & applied acarology     Volume:  47     ISSN:  1572-9702     ISO Abbreviation:  Exp. Appl. Acarol.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2008-12-30     Completed Date:  2009-03-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8507436     Medline TA:  Exp Appl Acarol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  133-45     Citation Subset:  IM    
School of Agricultural Science/Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54, Hobart, TAS 7001, Australia.
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MeSH Terms
Life Cycle Stages
Mites / growth & development*,  physiology
Pest Control, Biological / methods*
Predatory Behavior
Time Factors

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