Cankerworms in trees can be controlled with a fairly simple method called tree banding. Some cities have control programs in place, but it is possible to maintain the control of cankerworms yourself ,with the same or
similar methods they use on their public trees.
What are cankerworms?
Cankerworms are very destructive larvae laid by an adult cankerworm. These worms vary in different shades of green, from dark to light, with stripes down their backs. There are two basic types. One lays its eggs in the spring and one in the autumn. Both varieties have larvae which hatch in spring. They are a particular problem for certain varieties of ash, elm and maple. They are the most destructive in late spring or early summer, in May and June.
The cankerworms make their way up the tree and infect the crown of the tree. They move down the tree on a sticky, messy, silken web. When uncontrolled in areas with many of the affected trees the sticky webs not only create problems for the trees but make a mess on surrounding streets, cars and buildings. If the infestation is bad enough, the streets get a film of sticky substance which can make a destructive mess. (In Winnipeg in 2006, some tree areas did not get banded to prevent the spread of the cankerworms. The webs in some areas made the streets sticky enough that the ground was covered in a gooey surface. You could hear cars driving through it like cars sound driving on wet rainy streets. Car windows had to be cleaned continually. It got tracked inside from walking on the sidewalks and streets. It jammed up roll down windows. It could be felt on your skin and hair. It was coming down so thickly you could watch the webs streaming down like gossamer threads through the air. It didn't take long to have to redo what had already been cleaned up from the messes they created. ) This tiny creature can literally gum up the works woth its sticky silken webs.
What are cankerworms?
Cankerworms are very destructive larvae laid by an adult cankerworm. These worms vary in different shades of green, from dark to light, with stripes down their backs. There are two basic types. One lays its eggs in the spring and one in the autumn. Both varieties have larvae which hatch in spring. They are a particular problem for certain varieties of ash, elm and maple. They are the most destructive in late spring or early summer, in May and June.
The cankerworms make their way up the tree and infect the crown of the tree. They move down the tree on a sticky, messy, silken web. When uncontrolled in areas with many of the affected trees the sticky webs not only create problems for the trees but make a mess on surrounding streets, cars and buildings. If the infestation is bad enough, the streets get a film of sticky substance which can make a destructive mess. (In Winnipeg in 2006, some tree areas did not get banded to prevent the spread of the cankerworms. The webs in some areas made the streets sticky enough that the ground was covered in a gooey surface. You could hear cars driving through it like cars sound driving on wet rainy streets. Car windows had to be cleaned continually. It got tracked inside from walking on the sidewalks and streets. It jammed up roll down windows. It could be felt on your skin and hair. It was coming down so thickly you could watch the webs streaming down like gossamer threads through the air. It didn't take long to have to redo what had already been cleaned up from the messes they created. ) This tiny creature can literally gum up the works woth its sticky silken webs.
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