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Curcuma longa  has well-known insecticidal and repellent effects on insect pests, but its impact on  Trichoplusia ni  is unknown. In this study, the compound  ar -turmerone, extracted and purified from  C. longa  rhizomes, was identified, and its insecticidal effects, along with turmeric powder, curcuminoid pigments and crude essential oil were evaluated against this important agricultural pest. The role of natural (sesamol and piperonal) and synthetic [piperonyl butoxide (PBO)] synergists under laboratory and greenhouse conditions were also evaluated. The concentration of  ar -turmerone in  C. longa  rhizomes harvested was 0.32% (dwt). Turmeric powder and its derivatives caused 10–20% mortality in third instar  T. ni  at a very low dose (10 μg/larva). Addition of PBO increased toxicity of turmeric powder and its derivatives (90–97% mortality) in most binary combinations (5 μg of turmeric powder or its derivatives +5 μg of PBO), but neither piperonal nor sesamol were active as synergists. The compound  ar -turmerone alone and the combination with PBO reduced larval weight on treated  Brassica oleracea  in the laboratory and in greenhouse experiments, compared with the negative control. The compound  ar -turmerone could be used as a low cost botanical insecticide for integrated management of cabbage looper in vegetable production.

Turmeric powder and its derivatives from Curcuma longa rhizomes: Insecticidal effects on cabbage looper and the role of synergists