New Zealand Plant Protection 53 (2000): 406-409
Pot experiments were undertaken to investigate whether Argentine stem weevil Listronotus bonariensis adults placed on endophyteinfected or endophyte-free perennial ryegrass (Lolium perenne) exhibited behaviour differences that may lead to differing susceptibility to attack by the endoparasitoid Microctonus hyperodae. There was no difference (P>0.05) in the behaviour of weevils on pots of Nui ryegrass infected with either the wildtype endophyte Neotyphodium lolii or AR1, a N. lolii selection high in peramine but low in other key alkaloids. Although adults were offered no choice, over 60% of the adults were found off endophyte-infected plants during the observation period. Weevils on high endophyte plants were found to spend less time in positions highly favourable for parasitoid oviposition (e.g. feeding P<0.001) and more time in unfavourable positions (e.g. crouching P<0.01) than found on nil endophyte plants. The presence of parasitoids decreased the level of weevil feeding (P<0.001). These differing behavioural responses to endophyte explain an observed inverse linear relationship between peramine and parasitism in the field.
Keywords: Listronotus bonariensis, Microctonus hyperodae, Neotyphodium lolii.
|Effect of EpichloŽ endophyte strains in Lolium spp. cultivars on Argentine stem weevil parasitism by Microctonus hyperodae|
S.L. Goldson, F. Tomasetto and A.J. Popay (2015)
New Zealand Plant Protection 68: 204-211
Copyright © 2000 New Zealand Plant Protection Society (Inc.).