Outbreak of Biston regalis Moore (Geometridae, Lepidoptera) on blue pine (Pinus wallichiana) - a new record.
A severe outbreak of Biston regalis was observed for the first time on blue pine (Pinus wallichiana) in Pakistan in August 1980. This geometrid had never been reported as a serious agricultural or forest pest in that country before. Hundreds of hectares of forest were defoliated by larvae feeding on the bases of needles. Larvae were also found on Xylosma sp., Viburnum sp., Berberis sp., Nerium sp., wild rose, apple and walnut. The biology of the pest is described. Laboratory feeding tests showed that consumption by larvae was high on soyabean, mash [Vigna mungo] and pear.