Accession Number : ADA113695

Title :   Ecological Requirements of Chigger Mites.

Descriptive Note : Annual rept. no. 2, 1 Apr 81-31 Mar 82,


Personal Author(s) : Crossley,D A , Jr

Full Text :

Report Date : 31 Mar 1982

Pagination or Media Count : 46

Abstract : Research progress is reported on (1) biotic associates of free-living stages of chigger mites, (2) extraction efficiencies for different methods, (3) food preferences of adult Eutrombicula, and (4) vertebrate host associations for the chigger fauna. Adult Eutrombicula densities were in the range of 1-10 per squared m, based on flotation of soil samples. Flotation in salt solutions or tap water yielded 90% recovery, but so did 5-day tullgren extractions. The latter are for less labor-intensive. Eutrombicula adults were offered eggs of eight different soil collembolan species. Adults showed a high preference for eggs of only three of the species. Vertebrate host association in Georgia were dominated by Eutrombicula species. Infestation rates were higher on the Coastal Plain than on the Piedmont, and higher for reptiles than for birds or mammals. (Author)

Descriptors :   *Mites , Ecology , Requirements , Larvae , Hosts(Biology) , Sampling , Field conditions , Recovery , Georgia

Subject Categories : Biology

Distribution Statement : APPROVED FOR PUBLIC RELEASE