Die Reihenfolge der Wirtspflanzen beim Massenauftreten von Euproctis chrysorrhoea L

Summary Observations regarding outbreaks of Euproctis chrysorrhoea L. have been recorded in the Netherlands since 1940 by the Forest Insect Survey of the Itbon: 1. Usually, damage by the caterpillars only occurred in the southern and western parts of the country, but during very heavy outbreaks also further north. 2. The number of host species appeared to increase with the seriousness of the outbreak. 3. Apparently, in most cases, outbreaks resulted from the development of the endemic population. 4. The woody species were attacked in a definite order. 5. It is considered likely that this order is that in which the different species become suitable as food, as the result of different weather conditions.