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Increasing atmospheric carbon dioxide (CO 2 ) impacts plant growth and metabolism. Indirectly, the performance and feeding of insects is affected by plant nutritional quality and resistance traits. Life history and feeding behaviour of  Myzus persicae  were studied on pepper plants under ambient (aCO 2 , 400 ppm) or elevated CO 2  (eCO 2 , 650 ppm), as well as the direct impact on plant growth and leaf chemistry. Plant parameters were significantly altered by eCO 2  with a negative impact on aphid’s life history. Their pre-reproductive period was 11% longer and fecundity decreased by 37%. Peppers fixed significantly less nitrogen, which explains the poor aphid performance. Plants were taller and had higher biomass and canopy temperature. There was decreased aphid salivation into sieve elements, but no differences in phloem ingestion, indicating that the diminished fitness could be due to poorer tissue quality and unfavourable C:N balance, and that eCO 2  was not a factor impeding feeding. Aphid ability to transmit  Cucumber mosaic virus  (CMV) was studied by exposing source and receptor plants to ambient (427 ppm) or elevated (612 ppm) CO 2  before or after virus inoculation. A two-fold decrease on transmission was observed when receptor plants were exposed to eCO 2  before aphid inoculation when compared to aCO 2 .

Elevated CO2 impacts bell pepper growth with consequences to Myzus persicae life history, feeding behaviour and virus transmission ability