What is the Milfoil Weevil? Is it Found in Superior Montana


The eurasian water milfoil weevil (Euhrychiopsis lecontei) is known as an eco-friendly vegetation killer of some sorts of milfoil and also has actually been check out thoroughly by research researchers as a natural control for water milfoil in excess of 2 whole years. Generally because weevils are typically located in Superior, Montana United States fish ponds having eurasian watermilfoil issues, the probabilities are very good that they presently populate your fish pond. Yet, as a result of the fact watermilfoil will expand so quickly, 100% natural populaces of weevils merely can not generally manage it. As a result one method is to merely raise the organic milfoil weevil populace to lasting amounts enough to efficiently manage the eurasian water milfoil over the long-term.

What exactly is biocontrol? Natural control, or biocontrol, is thought about the treatment connected with breeding then letting go of all-natural enemies (predators and bloodsuckers) of various other organisms which are deemed parasites (hosts). An effective biocontrol representative is quite targeted to one or perhaps a very few hosts and that’s why, these 100% natural control representatives tend to be perfectly risk-free to individuals and also do not trigger damage to the real environment. They just improve the natural equilibrium of mother earth. Remain to bear in mind, however, that biocontrol does not totally eliminate these undesirable bugs; it keeps them at low levels where they aren’t believed to be a hassle.
Exactly how precisely does the milfoil weevil influence eurasian water milfoil in Superior?

Organic control bacteria really reduce their host plants. Not just does the weevil depend on the plants for nutrition, however in addition completing all of its living stages. Equivalent to a butterfly, the weevil’s lifespan phases have an egg cell, larvae, pupa, and then fully grown phase. When adults, they’ll consume the eurasian water milfoil, yet additionally search for dynamic watermilfoil suggestions (described as the meristem) to lay eggs. When the eggs hatch to larvae, the larvae passage down through the whole stem developing ports in the stem wall surfaces while it goes throughout and also hollows out the stem cells. This type of indoor damage hinders all the supply of nutrients all through the plant in addition to the roots, where power is kept for next years’ development. In addition, holes within the stem produced by the larvae make it possible for gas to leave as well as make the plant to shed buoyancy in the water. When the stem is assaulted by the weevil and then dies, it starts to fall over as well as weigh down neighboring stems, pulling them better from the lake surface area. This opens up the plant cover and enables wanted native plant to contend better, and also at some point replace the eurasian water milfoil beds.

In most cases, 3 to 4 added generations of milfoil weevil’s must 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 declines to a self-reliant level.

Specifically what outcomes can be expected while making use of the eurasian watermilfoil weevil? On the whole, the objective is to develop a longer term populace of the milfoil weevil’s which will constantly regulate the eurasian water milfoil for years to find. Combating large milfoil troubles could be hard with out a specific weevil-stocking methods to optimize success. This consists of stocking somewhat multitudes of weevils in many places over 2-3 years on average, depending upon the range of invasion. We likewise know that equipping added weevils in the very first year increases the rate connected with lake-wide control.


Desired control using the weevil commonly takes in between 2 or 3 years typically. Control includes:

  • Significant decrease in water milfoil thickness, and also in most cases reduction of almost all eurasian watermilfoil beds;
  • Maintenance of the making it through plants below the water’s surface area at non-nuisance arrays;
  • Assist to increase of indigenous plants types and also re-establishment of a varied indigenous plant neighborhood within locations as soon as covered with milfoil.

A lot of aquatic weed monitoring treatments are available by looking at our partner web sites shown to the right.