New Zealand Plant Protection 56 (2003): 123-128
Grass grub (Costelytra zealandica) population density, mean larval weight and visible damage were lower in meadow fescue (Festuca pratensis) infected with the endophyte Neotyphodium uncinatum (E+) than in uninfected meadow fescue (Eľ) in an unreplicated field trial. In two bioassays, third instar grass grubs ate all meadow fescue Eľ roots but significantly less of the E+ roots. Larvae fed E+ roots lost weight at the same rate as unfed control larvae. Larvae given a choice between maize and either E+ or Eľ meadow fescue in a pot trial consumed 33% more of the maize in the E+ treatment than in the Eľ treatment. Weight gain of larvae in E+ treatments was significantly less than in Eľ in both the choice and no-choice pot trials, but survival was the same. It was concluded that meadow fescue infected with N. uncinatum deters grass grub larval feeding but has no major toxic effects.
Keywords: meadow fescue, Neotyphodium uncinatum, endophyte, grass grub, Scarabaeidae.
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Copyright © 2003 New Zealand Plant Protection Society (Inc.).