Antifeedants Impact of Plant Essential Oil on Green Peach Aphid on Potato Crops

The antifeedant activities of different essential oils (EO) were tested against green peach aphids, and their potential role in inducing plant resistance pathways on potato cultivars was studied. Measuring the two common enzyme indicators, guaiacol Peroxidase (POX) and Polyphenol oxidase (PPO), expressed post-physical or chemical injury in plants. The impact of EO on aphid feeding behaviour was monitored using Electrical Penetration Graph (EPG) recording for 8 hrs post-treatment. The effect of the EO on aphid mortality was measured in vitro. The results showed that 60% of the essential oil extracts have insecticidal activity against M. persicae. The results also revealed that some EO has significantly increased the PPO level and had no significant impact of the different treatments on POX and insect behaviour than the control. Mustard, Sage, Jojoba, Eucalyptus, Bitter cucumber, Camphor, and Rosemary oil have natural induction in potato. Camphor, Sage, Pomegranate, and Bitter-cucumber caused a disturbance in the settling behavior of M. persicae and prolonged searching for a feeding site. Mustard, Eucalyptus, and Sage resulted in delaying drop potential associated with non-persistent and semi-persistent viruses. Lavender, Eucalyptus, and Mustard caused a delay in sieve element behavior related to persistent virus transmission.