Insect-antifeedant and antibacterial activity of diterpenoids from species of Plectranthus

Acetone extracts of leaves of species of Plectranthus (Lamiaceae) were tested for insect-antifeedant and antibacterial activity. An insect-antifeedant beyerane diterpenoid (1) was isolated from P. saccatus, together with several known abietane diterpenoids having both antibacterial and antifeedant activity from P. puberulentus and P. forsteri 'Marginatus'.