What is the Milfoil Weevil? Is it Found in Rose Valley Pennsylvania


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 consider meticulously by study scientists as an all-natural control for water milfoil over of 2 entire decades. Generally since weevils are usually located in Rose Valley, Pennsylvania United States fish ponds having eurasian watermilfoil concerns, the chances are excellent that they presently inhabit your fish pond. Yet, because of the truth watermilfoil will certainly expand so swiftly, 100% natural populations of weevils merely can not normally manage it. For that reason one method is to simply increase the natural milfoil weevil population to sustainable amounts enough to efficiently deal with the eurasian water milfoil over the long-term.

What exactly is biocontrol? All-natural control, or biocontrol, is considered the treatment related to breeding and afterwards letting go of all-natural opponents (predators as well as parasites) of different other microorganisms which are considered as pests (hosts). A reliable biocontrol representative is very targeted to one or probably a few hosts which’s why, these 100% natural control agents tend to be flawlessly safe to people and also do not cause damage to the real environment. They just improve the all-natural equilibrium of mother nature. Continue to bear in mind, nonetheless, that biocontrol does not completely get rid of these unwanted pests; it maintains them at reduced degrees where they aren’t thought to be an annoyance.
Just how specifically does the milfoil weevil influence eurasian water milfoil in Rose Valley?

Organic control microorganisms in fact reduce their host plants. Not only does the weevil trust the plant life for nutrition, however furthermore completing all its living phases. Equivalent to a butterfly, the weevil’s life expectancy phases have an egg cell, larvae, pupa, and then fully grown phase. When adults, they’ll eat the eurasian water milfoil, however additionally look for dynamic watermilfoil ideas (described as the meristem) to lay eggs. When the eggs hatch to larvae, the larvae tunnel down via the entire stem developing slots in the stem walls while it goes inside and out and also burrows the stem tissue. This type of indoor destruction hinders all the supply of nutrients all through the plant along with the origins, where energy is maintained for following years’ development. Furthermore, openings within the stem created by the larvae make it possible for gas to run away and make the plant to shed buoyancy in the water. When the stem is assaulted by the weevil and then dies, it begins to fall over and also weigh down neighboring stems, drawing them additionally from the lake surface. This opens up the plant cover and also permits desired native plant to complete better, and also eventually replace the eurasian water milfoil beds.

In most cases, 3 to 4 additional generations of milfoil weevil’s need to continue and also increase and spread out throughout the body of water in a season. Eventually, as the watermilfoil lowers within the treated body of water, the beetle number steadily declines to a self-sufficient degree.

Exactly just what results can be anticipated while making use of the eurasian watermilfoil weevil? Overall, the objective is to construct a longer term people of the milfoil weevil’s which will persistently control the eurasian water milfoil for many years to find. Combating large-scale milfoil problems can be difficult with out a certain weevil-stocking methods to optimize success. This includes equipping somewhat multitudes of weevils in several areas over 2-3 years on average, relying on the scale of problem. We also understand that stocking additional weevils in the initial year raises the price associated with lake-wide control.


Desired control taking advantage of the weevil usually takes between 2 or 3 years typically. Control entails:

  • Substantial decrease in water milfoil thickness, as well as in most cases reduction of mostly all eurasian watermilfoil beds;
  • Upkeep of the surviving plants listed below the water’s surface at non-nuisance arrays;
  • Assist to boost of native vegetation types and re-establishment of a varied native plant neighborhood within places as soon as covered with milfoil.

A great deal of aquatic weed monitoring solutions are available by looking at our partner web sites shown to the right.