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Porthesia scintillans , a serious pest threat to major crops. Here, we evaluated the toxicity of  Caulerpa scalpelliformis  fractions (CSF1, CSF2, and CSF3) against  P. scintillans . Fraction CSF1 attracted  P. scintillans  larvae whereas CSF2 and CSF3 showed repellency.  P. scintillans  showed significant higher insecticidal activity when fed with CSF2 fraction sprayed castor leaves. Similar observation was recorded in standards, vijayneem and monocrotophos. The GC–MS analysis of CSF2 and CSF3 described hexadecanoic acid, octadecenoic acid, and octadecatrienoic acid which might promote insecticidal activity. Hence, fatty acid based  C. scalpelliformis  extract preparations may be used for safe and eco-friendly agricultural pest.

Toxicity of Caulerpa scalpelliformis selected fractions with fatty acids on Porthesia scintillans