aporia crataegi, ermine moth, moth, and ringed and gypsy moth. many caterpillars in web on tree. plant pest, treatment and

agricultural animal aporia aucuparia bare bleak branch bug butterfly caterpillar cherry cocoon collective control cover crataegi crawling damage dangerous destruction disease eat ermine fauna filament grass green infection insect intermedia larva lepidoptera many moth nature needle parasite pest poisonous problem prunus pyrus serotina silk skeleton skin sorbus spinosa stage tent together tree twig white wild wildlife