Oviposition deterrent activity of andrographolide against the diamondback moth (DBM), Plutella xylostella (Lepidoptera: Yponomeutidae)

Andrographolide, the main constituent of the tropical shrub Andrographis paniculata, was studied for its oviposition deterrence against the diamondback moth (DBM). In the no-choice experiment, andrographolide applied at 1, 000 ppm on five-week-old cabbage plants significantly reduced the number of eggs laid by the moths by about 50%. However, this compound has no oviposition deterrent activity when applied at 250 and 500 ppm. On the other hand, the choice experiment showed that 250, 500 and 1, 000 ppm andrographolide sprays reduced moth oviposition by 72 to 81%.