Negative Ecological Effects of the Musk Thistle Biological Control Agent, Rhinocyllus Conicus

2000 ◽  
pp. 215-243 ◽  
Author(s):  
Svata M. Louda
Keyword(s):  
Biological Control ◽  
Biological Control Agent ◽  
Control Agent ◽  
Ecological Effects ◽  
Rhinocyllus Conicus

Effects of Mowing or SprayingCarduus thoermerionRhinocyllus conicus

1991 ◽  
Vol 5 (3) ◽  
pp. 628-631 ◽  
Author(s):  
Philip W. Tipping
Keyword(s):  
Biological Control ◽  
Biological Control Agent ◽  
Control Agent ◽  
Growth Stages ◽  
Full Bloom ◽  
Rhinocyllus Conicus

In 1988, mowing C.thoermerionce at the bud stage, twice at the bud stage, or once at early bloom of the primary inflorescences, eliminated emergence ofRhinocyllus conicus, a weevil introduced as a biological control agent. Mowing at full bloom reduced weevil survival by 78.8%, whereas mowing at senescence had no effect. In 1989, mowing at full bloom or senescence did not affect weevil survival. Dicamba applied at the full bloom or senescence stage did not affectR. conicussurvival, whereas hexazinone reducedR. conicussurvival when applied at all growth stages.

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