Impact of triclopyr amine on Galerucella calmariensis L. (Coleoptera: Chrysomelidae) and a step toward integrated management of purple loosestrife Lythrum salicaria L. / Cory John Lindgren, T. Shane Gabor, and Henry R. Murkin.
Material type:
TextSeries: Biological Control. 12(1) 14-19 Publication details: 1998.Description: illustrations ; 28 cmLOC classification: - LIN
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Includes bibliographical references (pages 18-19).
There is a need to investigate the potential for the
integration of classical biological control strategies with
herbicidal control strategies for themanagementof purple
loosestrife (Lythrum salicaria) in North America. The
objectives of this study were to determine the effects of
triclopyr amine at 12 kg/ha on the survival and fecundity
of adult Galerucella calmariensis and on the ability of
third instar larvae to pupate through to teneral adults. To
examine the effects of triclopyr amine on oviposition,
adult G. calmariensis were divided into three experimental
groups: a direct contact group, an indirect contact
group, and a control group. Each experimental treatment
was replicated three times. Twenty adults (10 pairs) were
used in each replication. Differences were not detected
between the number of adults that survived in each of the
three groups, the total number of eggs oviposited by
adults in each group, or the total number of egg masses
oviposited in each group. However, the adults in the
indirect contact group oviposited significantly smaller
meanegg-batch sizes. Eggs oviposited by each group were
placed in petri dishes and monitored until the third instar
stage when they were transferred to pupation chambers.
Differences were not detected between the mean number
ofnewgeneration adults produced between experimental
groups. To examine the effect of triclopyr amine on the
ability of G. calmariensis third instar larvae to pupate to
teneral adults, third instar larvae were divided between a
control group and a triclopyr amine group. Larvae were
sprayed to wetness with triclopyr amine at the rate of 12
kg/ha, placed into pupation chambers, and monitored for
adult emergence. Differences were not detected between
the number of larvae that pupated through to teneral
adults in the control group vs the triclopyr amine group.
Baseduponthese resultsweconclude that triclopyramine
is compatible with the classical biological control agent G.
calmariensis.