Compatibility of glyphosate with Galerucella calmariensis : A biological control agent for purple loosestrife (Lythrum salicaria) / Cory John Lindgren, T. Shane Gabor, and Henry R. Murkin.

Includes bibliographical references (page 48).

By integrating
Galerucella calmariensis
with glyphosate there
is potential to achieve both immediate and sustained control
of purple loosestrife (
Lythrum salicaria
). The objective of this
study was to determine the compatibility of glyphosate on the
oviposition and survival of adult
G. calmariensis
and on the ability of
G. calmariensis
third instar larvae to pupate to teneral
adults. Our results revealed glyphosate (formulated as
Roundup
®
) at a concentration of 2% (2.43 L/acre) and 4%
solution (4.86 L/acre) had no impact on the ability of
G. calmariensis
third instar
larvae to pupate to new generation
adults. To examine the effect of a 2% solution of glyphosate
on adult
G. calmariensis
oviposition and survival, adults were
randomly divided between a direct contact group (adults
sprayed directly), an indirect contact group (host plants with
adults were sprayed), and a control group. Our results
revealed that glyphosate does not impact
G. calmariensis
oviposition
or adult survival. The results of this study indicate
that
G. calmariensis
is compatible with glyphosate indicating
that further field studies examining integrated control strategies
for purple loosestrife are warranted.