Abstract
The mechanism of control of pheromone production was investigated in Plodia interpunctella, a moth infesting stored products. Brain-suboesophageal ganglia extracts of P. interpunctella possessed pheromonotropic activity when tested on Helicoverpa armigera females during their photophase. A significant stimulation of Z11-hexadecenal titres, the main pheromone component of H. armigera, occurred when females were injected with 1 brain-suboesophageal ganglion equivalent from P. interpunctella as well as the related moth, Ephestia cautella. Decapitation of P. interpunctella females for 24 h prevented the normal production of Z,E 9,12 tetradecadienyl acetate, the main pheromone component. This was reversed by injections of synthetic Hez-PBAN as well as P. interpunctella Br-SOG extracts. Hez-PBAN, injected to P. interpunctella females during the photophase, also induced a large increase in Z,E 9,12 tetradecadienyl acetate. Mating caused a sharp decline 3 h afterwards. Hez-PBAN was also shown to stimulate the production of pheromone de novo using isolated pheromone gland preparations of P. interpunctella.
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