Document Detail

Population dynamics of Panonychus osmanthi (Acari: Tetranychidae) on two Osmanthus species.
MedLine Citation:
PMID:  14635810     Owner:  NLM     Status:  MEDLINE    
Panonychus osmanthi is a non-diapausing species of spider mite that superficially resembles P. citri. It infests Osmanthus species, which are evergreen roadside and garden trees. The population dynamics of P. osmanthi were studied on Osmanthus aurantiacus and O. x fortunei during a three-year period. Seasonal changes in P. osmanthi populations were fundamentally the same in each year, although their density differed greatly from year to year. The P. osmanthi population was bimodal, with one peak in spring (May-June) and another in winter (November-January). Populations abruptly declined after the spring peak. Predators showed a delayed density-dependent response to changes in spider mites from spring to summer, whereas in autumn and winter, predators were few because they had entered diapause. To determine the effect of predators on the rapid decline of spider mites just after the spring peak, the predators were removed by treating the trees with a synthetic pyrethroid. As a result, spider mite density did not decline after the spring peak and remained at a high level during the June-August period when spider mite density is usually very low. This suggests that predators play an important role in the drastic decline of P. osmanthi density just after the spring peak.
Yasuki Kitashima; Tetsuo Gotoh
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
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:  227-40     Citation Subset:  IM    
Laboratory of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, 300-0393 Ami, Ibaraki, Japan.
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MeSH Terms
Mite Infestations / parasitology*
Oleaceae / parasitology*
Plant Leaves / parasitology
Population Dynamics
Predatory Behavior
Tetranychidae / growth & development*
Reg. No./Substance:
0/Insecticides; 52645-53-1/Permethrin

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