What is the Milfoil Weevil? Is it Found in Swede Grove Minnesota


The eurasian water milfoil weevil (Euhrychiopsis lecontei) is referred to as an environmentally friendly plants killer of some types of milfoil and has actually been take a look at very carefully by research scientists as an all-natural control for water milfoil over of 2 entire years. Primarily due to the fact that weevils are normally found in Swede Grove, Minnesota USA fish ponds having eurasian watermilfoil issues, the chances are great that they presently inhabit your pond. Yet, because of the fact watermilfoil will certainly expand so rapidly, natural populaces of weevils just can not usually handle it. As a result one means is to just raise the natural milfoil weevil population to sustainable quantities adequate to efficiently deal with the eurasian water milfoil over the lasting.

Just what is biocontrol? Natural control, or biocontrol, is thought about the treatment related to breeding and then releasing natural adversaries (predators and bloodsuckers) of numerous other microorganisms which are deemed bugs (hosts). An efficient biocontrol agent is pretty targeted to one or possibly a very few hosts which’s why, these all natural control agents have the tendency to be completely safe to people and also do not trigger harm to the actual environment. They simply improve the all-natural balance of nature. Remain to remember, however, that biocontrol does not completely eliminate these unwanted parasites; it maintains them at reduced levels where they typically aren’t thought to be an annoyance.
Just how exactly does the milfoil weevil impact eurasian water milfoil in Swede Grove?

Organic control bacteria in fact lower their host plants. Not just does the weevil trust the plants for sustenance, but furthermore completing all its living phases. Similar to a butterfly, the weevil’s life expectancy stages have an egg cell, larvae, pupa, then fully grown phase. When adults, they’ll consume the eurasian water milfoil, however additionally search for dynamic watermilfoil suggestions (referred to as the meristem) to lay eggs. When the eggs hatch to larvae, the larvae passage down through the whole stem creating slots in the stem walls while it goes in and out as well as burrows the stem tissue. This type of indoor destruction prevents all the supply of nutrients throughout the plant along with the roots, where power is preserved for next years’ growth. In addition, openings within the stem developed by the larvae enable gas to get away as well as make the plant to shed buoyancy in the water. When the stem is attacked by the weevil and then dies, it starts to fall over as well as bear down nearby stems, drawing them further from the lake surface. This opens up the plant cover and enables desired indigenous plant to compete better, and also eventually change the eurasian water milfoil beds.

For the most parts, 3 to 4 extra generations of milfoil weevil’s ought to carry on as well as multiply and expand throughout the body of water in a season. Ultimately, as the watermilfoil minimizes within the treated body of water, the beetle number progressively decreases to a self-sustaining degree.

Specifically what outcomes can be expected while making use of the eurasian watermilfoil weevil? On the whole, the objective is to build a longer term people of the milfoil weevil’s which will persistently manage the eurasian water milfoil for many years ahead. Combating large-scale milfoil problems could be tough with out a certain weevil-stocking strategies to maximize success. This consists of stocking somewhat great deals of weevils in several places over 2-3 years on average, depending on the scale of invasion. We also understand that stocking added weevils in the first year elevates the price associated with lake-wide control.


Desired control taking advantage of the weevil normally takes between 2 or 3 years on average. Control includes:

  • Huge decline in water milfoil thickness, and for the most parts decrease of almost all eurasian watermilfoil beds;
  • Maintenance of the enduring plants listed below the water’s surface area at non-nuisance varieties;
  • Assist to raise of indigenous plants types as well as re-establishment of a varied indigenous plant community within places once covered with milfoil.

A lot of aquatic weed administration treatments are offered by looking at our companion web sites shown to the right.