Abstract
Invertebrates were removed from soil samples taken from 15 test plots (0.11-0.38 acre) in an irrigated pasture at Tucson, Arizona, treated 2 years previously with various insecticides. Tullgren funnel and benzene extraction procedures were utilized. Mites and Collembola represented 63 and 31%, respectively, of the invertebrates collected. Analysis of variance indicated no significant differences between plots in total counts of mites and Collembola. There were differences among the treatment means for the other arthropods. 80-90% (∼6700 of 7865 specimens) of the mites in the plots treated with endosulfan, endrin, and DDT were orihatids; those in the DDT-Strobane® (terpene polychlorinates (65% chlorine)) plot were 70-80% (∼350 of 466 specimens) mesostigmatids. Ground pearl ( Margarodes sp.) crawlers were obtained from all plots except that treated with Strobane-DDT. The malathion-Perthane (a mixture of 1,1-dichloro-2,2-his (p-ethylphenyl) ethane (95%) and related reaction products (5%)) plot yielded approximately 2000 more animals than any other, includiug the check plot. Predawn appears to be the best time for sampling of soil arthropods.
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