Garry, the full study was, i think, published in Nature the Journal Vol.399, number 6733 pg 214 try this page for the study abstract. http://www.ent.iastate.edu/entsoc/ncb99/prog/abs/D81.html another report at http://www.ipm.iastate.edu/ipm/icm/1999/6-14-1999/monarchbt.html regards peter g