Modelling of two-dimensional spatial effects on the spread of forest pests and their management

This work reports the modelling of forest pests, using a recent model for gypsy moth (Lymantria dispar (Lepidoptera: Lymantriidae)) populations in a two-dimensional, homogeneous stand of host trees. While the underlying dynamics of the model may be either periodic or chaotic, it was found that if spraying is done, the observed dynamics appear to be chaotic. In addition, it was found that in some cases, spraying with a strong pesticide can actually benefit the pest, increasing the amount of damage done to the foliage. Under some conditions it was found that a small land-owner may not be at a disadvantage if the area surrounding his/her land is not treated with a pesticide.