What is the Milfoil Weevil? Is it Found in Benton Heights Michigan


The eurasian water milfoil weevil (Euhrychiopsis lecontei) is referred to as an environmentally friendly plant life predator of some types of milfoil as well as has actually been look at very carefully by study scientists as a natural control for water milfoil over of 2 entire decades. Generally due to the fact that weevils are generally discovered in Benton Heights, Michigan USA ponds having eurasian watermilfoil problems, the possibilities are great that they presently inhabit your pond. Yet, due to the truth watermilfoil will certainly expand so rapidly, all natural populaces of weevils merely can not usually handle it. For that reason one means is to simply raise the natural milfoil weevil population to lasting quantities adequate to successfully take care of the eurasian water milfoil over the lasting.

Just what is biocontrol? All-natural control, or biocontrol, is taken into consideration the procedure connected with reproduction and after that releasing natural enemies (predators and also bloodsuckers) of numerous other organisms which are viewed as parasites (hosts). An efficient biocontrol agent is quite targeted to one or maybe a few hosts and that’s why, these natural control representatives tend to be perfectly risk-free to people and also do not trigger injury to the real atmosphere. They merely enhance the all-natural balance of nature. Continuously bear in mind, nonetheless, that biocontrol does not totally do away with these undesirable pests; it keeps them at low levels where they aren’t believed to be a hassle.
How specifically does the milfoil weevil influence eurasian water milfoil in Benton Heights?

Organic control microbes actually decrease their host plants. Not just does the weevil depend on the greenery for nutrients, but in addition finishing all its living stages. Comparable to a butterfly, the weevil’s lifespan phases have an egg cell, larvae, pupa, and afterwards fully grown stage. When grownups, they’ll consume the eurasian water milfoil, yet additionally search for vibrant watermilfoil suggestions (described as the meristem) to lay eggs. When the eggs hatch to larvae, the larvae passage down through the entire stem creating slots in the stem walls while it goes throughout and burrows the stem tissue. This kind of interior destruction inhibits all the supply of nutrients throughout the plant along with the origins, where energy is kept for next years’ growth. Moreover, openings within the stem created by the larvae allow gas to leave and make the plant to shed buoyancy in the water. When the stem is attacked by the weevil then perishes, it starts to tip over and also bear down nearby stems, drawing them further from the lake surface. This opens the plant cover and permits wanted native plant life to contend much better, and also at some point replace the eurasian water milfoil beds.

Most of the times, 3 to 4 added generations of milfoil weevil’s must continue as well as multiply as well as spread out throughout the body of water in a period. Eventually, as the watermilfoil reduces within the treated body of water, the beetle number steadily decreases to a self-sufficient degree.

Specifically what results can be expected while making use of the eurasian watermilfoil weevil? On the whole, the purpose is to develop a longer term population of the milfoil weevil’s which will persistently manage the eurasian water milfoil for several years ahead. Combating massive milfoil issues could be hard with out a particular weevil-stocking techniques to enhance success. This consists of stocking somewhat large numbers of weevils in numerous areas over 2-3 years on average, depending upon the range of invasion. We additionally know that stocking added weevils in the initial year elevates the price associated with lake-wide control.


Preferred control using the weevil normally takes in between 2 or 3 years typically. Control involves:

  • Big decrease in water milfoil thickness, and also most of the times decrease of almost all eurasian watermilfoil beds;
  • Maintenance of the surviving plants listed below the water’s surface at non-nuisance varieties;
  • Aid to increase of native vegetation types as well as re-establishment of a varied indigenous plant area within locations as soon as covered with milfoil.

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