Reports

Caffeine and related methylxanthines: possible naturally occurring pesticides

Science  12 Oct 1984:
Vol. 226, Issue 4671, pp. 184-187
DOI: 10.1126/science.6207592

Abstract

Natural and synthetic methylxanthines inhibit insect feeding and are pesticidal at concentrations known to occur in plants. These effects are due primarily to inhibition of phosphodiesterase activity and to an increase in intracellular cyclic adenosine monophosphate. At lower concentrations, methylxanthines are potent synergists of other pesticides known to activate adenylate cyclase in insects. These data suggest that methylxanthines may function as natural insecticides and that phosphodiesterase inhibitors, alone or in combination with other compounds, may be useful in insect control.