Switchgrass Moth
(Blastobasis repartella Dietz)

Last modified, 01 April  2009
Contents © P.J. Johnson, 2008-2009

The larvae of this attractive little moth was discovered by scientists at South Dakota State University in 2006 as the insect responsible for losses on a private farm specializing in seed production of native grasses.  In 2007, at research farms in South Dakota we found that 40% or more of new tiller growth was lost to the caterpillar.  In 2008 the adult moth was captured in rearing cages and subsequently reared from larvae kept on an artificial diet provided by colleagues at the University of Illinois.  Specimens are presently with a research taxonomist with the USDA at the U.S. National Museum of Natural History.

Specimen Images
Adults compared
Male
    males on outside of emergence cage
Female
Larva
    larva in stem
    larva in proaxis
Pupa - dorsal, lateral, ventral
    pupa in situ
Host Relations
Proaxis with frass plug
Proaxis and tiller base
Stem with emergence hole
Springtime dead tillers
Diagnostic dead tiller flag
Bored tiller core
Cracking and necrosis at emergence hole

Predators/Parasitoids
Bassus difficilis