Over time our confidence that processionary caterpillars are the major cause of EAFL has progressively grown stronger, based on: experimental studies where administration of processionary caterpillars and caterpillar exoskeleton has reliably caused abortion in pregnant mares with the same signs as in field cases. observations of processionary caterpillars in trees either in or adjacent to … Continue reading How confident are we that processionary caterpillars cause EAFL?