Isoryanodol-type diterpenes

To further asses such hypothesis we carried out a comparative study on the antifeedant and insecticidal effects of the ryanodol/isoryanodol-type diterpenes from P. indica (non-alkaloidal type ryanoids 1-9) [9, 10, 11] and ryanodine-type (alkaloidal type) ryanoids (ryanodine/spiganthine ryanoids 10-18), isolated from Spigelia anthelmia (Loganiaceae) [15, 16]. We studied their effects on the feeding behavior, survivorship and performance (biomass gain and food ingestion) of S. littoralis larvae and L. decemlineata (Colorado potato beetle, CPB) adults [17]. 

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