ocr: TALKI BOREM. CRLOAUMCNAE tmF FLES, STIMMIOPSS - Pitting parasites against pests, a researcher in India (top) releases flies that attack sugarcane-destroying caterpillars. The growing maggot (visible as al bulge in the stalk borer caterpillar above, at right) eats the insides out of its doomed host. After eviscerat- ing it, the white fly larva emerges, middle, then pupates, left. Unlike insects such as praying mantises that devour both bad and beneficial bugs, many parasites are host specific- "picky eaters, - says one expert- -ideal agents for targeted biocontrol.