paia parasites ites used to fight caterpillars aggressive war on pests Is being waged bullions millions of small inesti liberated on the cattle ranges of south west united states to destroy the eggs of the range catera liar ilar a pest wh cli ch after having been comparatively inac in live e there for ten years th thre itene I 1 to eat up all the range grass over a w IP area siss the scientific american to be ready for the coming of the liter iter pillars govern t entorno entomologists ois s throughout the winter produced the parasites at the rate of CO 60 a aty il iv and placed them in cold storme stor ige at the temple arizona field station the vast insect army Is now being dei loyed over the grazing gr ands where the range caterpillar Is present in the egg stage in large numbers the tin tim paras tes will at once attack the tatu pillar eg eggs S and it Is hoped quickly reduce the number of caterpillars to normal similar paras tes are being tried out against many insect pests include ng the alfalfa weevil c dl ng moth oriental fruit worm and the corn boier but this Is the first time they have been tried on a large scale against the range caterpillar