The Milfoil  weevil is a little water bug that could be able to rescue troubled ecosystems. This stems  from the fact that it only eats milfoil and is harmless to mankind).
 
Two sorts of milfoil exist in the Us. There is a  indigenous one and an invasive species of Eurasian milfoil. The indigenous species poses no threat but the Eurasian strain is very harmful. Eurasian Milfoil is the reason the milfoil weevil is so important.  
 
Eurasian Milfoil (the primary milfoil that will be referenced from  this point on) probably came to The Us between the 1800’s and the 19404’s as an unwelcome  passenger on some large ship. Because of its ability to travel on boat anchors,  bottoms, and propellors it spread widely, bringing with it drastic ecological shifts and  extra problems for people.   Luckily this can spread the milfoil weevil as well.
 
It spreads quickly and demolishes ecosystems by choking out the native flora life which  reduces food for water fowl, reduces habitat for fry, and reducing fishing by animals.   The mats formed by the milfoil do not allow the wind to bring fresh oxygen to the water and this will result in the ultimate  death of fish and a rush in algae growth.
 
For mankind, it reduces the recreational uses of the water by swimmers, boaters, and  fisherman.  For communities, the dense mats can clog water intakes or overflows, causing water shortfalls in some places and flooding in others.  In dykes, they choke and break generators and reduce electricity production.  
 
One small weevil may hold the solution to  the milfoil dilemma.   The milfoil weevil favors Eurasian milfoil to the indigenous variety, which  means that the invasive species are killed over time and native floras are allowed to  bit by bit recover. With a high reproduction  rate and a taste for milfoil, the milfoil weevil and a smart and safe way to remove the  unwelcome milfoil. When looking at how the milfoil spreads it becomes clear and why milfoil weevils control it so well.  
 
This water plant spread rapidly because broken bits can sink to the bottom and easily form new plants. Aquatic  harvesting devices are not productive because they break the plant and bits come off and  replant themselves elsewhere. Vacuum dredging works a small better because no broken bits are left behind, but at  the same time the vacuum disrupts the water and could leave no plant life at the bottom.
 
  With a taste for Eurasia milfoil rather than the native milfoil, the weevil eats the plant  from the inside out, finally destroying the whole plant. Weevils  have a short life, living no more than 30 days, so before the winter comes, three  generations will live and die before they come ashore for the winter. Milfoil weevils  do have wings, but no one has ever seen them fly so no on knows exactly how the come ashore for the wintertime.   Once based in a habitat, the milfoil weevil will live even through the coldest Minnesota winters.