What causes increases and decreases in gypsy moth populations?
The gypsy moth first began defoliating New Jersey forests in 1966. Three major population cycles have occurred, one in 1972 when 256,000 acres were defoliated, another in 1981 when 798,000 acres were defoliated, and another in 1990 when 431,000 acres were defoliated. A cycle is completed when after years of steady build-up, the larval populations peak and dramatically crash the following season. This is caused by starvation, along with fungal and viral outbreaks, which have reduced populations from 80 to 90 percent in certain areas. Parasites and predators also help to keep gypsy moth populations at low levels in conjunction with these fungal and viral outbreaks. These periods of stable low gypsy moth populations may last for five years or more. Q: What can a homeowner do to be included in the Department’s Cooperative Gypsy Moth Suppression Program? A: Since there are certain legal and fiscal requirements for participation in the aerial spray program, the Department can only work with
