Abstract
Nicotine has been found an effective photosensitizer for DDT. At DDT: nicotine (1:5), DDT along with its formed degradation products DDD, DDE and DBP disappeared within 18 and 60 days under UV and sunlight respectively. Because of persistence, nicotine proved a superior photosensitizer to N, N'-diethylaniline. In DDT emulsifiable concen-trates it led to high alkalinity but no DDT degradation up to 60 days at 20_??_25°C. 0.1 and 0.5% DDT emulsions from these formulations showed no adverse effect on Daucus carrota, Vicia faba, Brassica oleracea var. botrytis, and Dahlia sp., but showed mild to severe phyto-toxicity against Pisum sativum and Cicer arietinum; caused by high concentration of nicotine. On Clerodendrum sp. in sunlight, these formulations showed over 20% faster DDT loss be-tween 3_??_15 days of application. DDT-nicotine mixtures showed no synergism against Tribolium castaneum Herbst.
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