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Insect-control chemicals from plants. II. Effects of five natural norditerpene dilactones on the development of the housefly.

The effects of feeding five natural norditerpene dilactones (hallactone A, podolactones A, C, and E, and sellowin A) to housefly larvae (Musca domestica L.) reared on a defined diet were determined. Podolactone E was the most active compound, completely suppressing development at 5 p.p.m. Podolactone A was the least active compound. The lactones were not active when applied topically at the rate of 5 flg per insect to 3-4-day-old larvae or to 2-3-day-old adults.