At the risk of repeating myself, gypsy moth, again
It is rapidly approaching that time of year when gypsy moth pheromone traps will be going up. As a result of the major expansion of gypsy moth in the Tri-State Area (WI, IO, MN) over the past several years, the three states will be increasing the number of traps placed in 1997. Over in Wisconsin, we understand that four counties in the Door peninsula are under quarantine this year with several more under a "transitional" quarantine. Full quarantine counties include Door, Kewaunee, Manitowoc, and Brown. It is imperative that we get a clear idea of leading edge of the infestation. In Minnesota, the Departments of Agriculture (both state and federal) will be fielding a full slate of trappers this year and concentrating their efforts in the high risk southeastern portion of the state.
In total, these efforts (see map) will require the time of 18 summer trappers. Counties bordering Wisconsin and Iowa will be trapped at one trap per square mile along with an "expanded" Metro Region. In addition, Duluth, St. Cloud, and Rochester will be trapped at one trap per square mile. An additional 14 counties will be trapped at a lower density of one trap per four square miles. DNR trapping in State Parks, campgrounds, rest areas, etc. will continue as normal.
Traps distributed to DNR foresters, state parks managers, and private cooperators should be placed in the field during the first week in July. The trap used is triangular, seven inches long, sticky on the inside, and contains a small strip hanging from the inner top. The strip contains a synthetic copy of the chemical given off by the female gypsy moth that attracts male moths. If a trap catches one or more male gypsy moths, intensive trapping during the next two years is done in that area. If a population of gypsy moths is so located, eradication of the population is the next step.
As usual, it is possible that DNR and MDA trappers might find themselves placing a trap near each other. A few years ago they placed traps on opposite sides of a single tree. If this happens, just move your trap to another nearby location. Call your region specialist if you have placement questions.