spongy moth caterpillar killed by nuclear polyhedrosis virus

tree plant trunk branch leaf wood green woodland soil flower forest deciduous grass grove shrub nature autumn produce spruce spongy moth caterpillars killed nuclear polyhedrosis virus invasive nucle nucleo nucleopolyhedrosis connecticut chrysalis maimaiga entomosphaga npv adult american animal biodiversity bug conservation defoliation destructive detrimental dispar environmental european fairfield female gypsy habitat impact insect irritating loss lymantria north oak preservation problem species spread spring squantz summer trees wild wildlife worldwide caterpillar