Proceedings: Edited by G. Owen Evans

acaricides Acarina Acarology acid activity adult animals appear associated attachment biological cattle cells changes chemicals citrus collected complete Congress containing counting culture density described determine distribution effect eggs engorged experiments extraction factors feeding females field genera genus host humidity important increase indicated individuals infestation insects International known laboratory larvae later leaf leaves less limited males material mean method natural nymphs observed obtained occur organs parasites pattern period placed plants population possible predator present prey probably production recorded REFERENCES relative remain reported Research resistance samples season setae shield showed shown similar soil species specimens spider mites stages strain structure suggested surface Table temperature ticks tion trees ulmi University urticae various