Et tu, Weevil?
J. Aquat. Plant Manage 38: 78-81 (2000)
A study led by Robert P. Creed, Jr., of Appalachian State University investigates the use of biological control to restrain the spread of Myriophyllum spicatum, better known as the Eurasian watermilfoil. This aquatic plant has invaded lakes across North America, and scientists are examining the effects of the North American weevil (Euhrychiopsis lecontei) on watermilfoil on 4 environmental levels ranging from the individual plant to entire geographic regions. On the smallest scale, that of an individual plant, weevil larvae damage meristems, which hinders stem growth, and both larvae and pupae injure vascular tissue, preventing roots from getting nonstructural carbohydrates. Also, scientists found that weevils can make watermilfoil beds collapse in lakes, but the precise weevil density to cause this is uncertain. More research concerning aquatic predators, the nutrient content in sediment, and the regional climate is necessary. Creed concludes that further investigation is crucial at all four spatial levels to determine the efficacy of weevil biocontrol on watermilfoil.
February 6th, 2010 at 4:30 pm
I can relate to Emily’s article a great deal since mine pertains to the same subject of the use of biocontrol, specifically using weevils. This is a very detailed analysis of the effectiveness of the North American weevil, and like my own article, the use of biocontrol is highly recommended because of little to no negative side of using biocontrol. However, both the researchers of my our articles recommend more research to be done to confirm the extent that biocontrol can be effective and also the relationship between the plant that is trying to be controlled and the biocontrol agent. The researchers of my article have found that the salvinia weevils do not feed on other vegetation if giant salvinia populations decline (risking starvation), giving more credibility to the use of these weevils. The only question I have to the researcher of Emily’s article is whether or not there is evidence that the North American weevil does not attack other plants because that determines if biocontrol is the best option. Also, I wonder will environmental factors hinder the effectiveness of these weevils or if constant introduction is needed. Overall, it seems like biocontrol is a viable option that can constantly manage the growth of aquatic invasive plants.
February 6th, 2010 at 6:01 pm
This is a very good summary of a primary research article that obviously contained a great deal of information. I feel like I understand the main point of the article without having read it at all, so the purpose of the highlight is accomplished. The only advice I would give is to introduce the topic/subject of the weevil earlier in the highlight because I was confused exactly what the subject was until halfway through the highlight. Another suggestion would be to change the last sentence to something more conclusive; it seems rather general and broad right now. Very good article and summary, though.