INSECT ANTIFEEDANT COMPOUNDS FROM CONVOLVULUS-MICROPHYLLUS (L) SIEB

Various extracts/fractions of the whole plant of Convolvulus microphyl lus (Convolvulaceae) were bioassayed by the leaf disc method for feedi ng deterrence using Spilosoma obliqua Walker as a test insect. A new c ompound, 29-oxodotriacontanol isolated from the chloroform fraction of this plant was proved to be a potent antifeedant constituent under la boratory evaluations, whereas another compound, tetratriacontanoic aci d was reported for the first time from this plant. The azadirachtin an d crude neem extracts were taken as standard. A new compound (29-oxodo triacontanol) produced 85.74% inhibition at 8000 ppm concentration.