Aquatic Botony 76.3, 259-265 (2003).
Sallie P. Sheldon and Robert P. Creed, Jr. (2003) published findings in Aquatic Botany regarding the success that the biological control agent, Euhrychiopsis lecontei, had in decreasing biomass of the invasive Eurasian water milfoil (Myriophyllum spicatum). Native milfoils were exposed to varied numbers of weevils in a controlled laboratory setting. In vials containing more weevils, the milfoil had lower shoot lengths, highlighting a negative consequence when weevils were overly abundant. However, milfoils exposed to only one or two weevils did not have a significant plant biomass reduction. The experiment also showed that weevils did not hatch on native milfoils, suggesting that the reduced fecundity would leave native species at lower risk of harm. Sheldon and Creed (2003) concluded that E. lecontei are host-specific, and would be an appropriate control option for Eurasian water milfoil.
Your explanation of this study is perfect for a research highlight- thorough and concise. It’s interesting that the weevils did not hatch on native milfoils. That seems like an ideal biocontrol as long as it is effective enough to damage the Eurasian water milfoil.