Polygraphus major Stebbing

Beaver, Roger A. & Smith, Sarah M., 2022, The bark and ambrosia beetles of Bhutan (Coleoptera: Curculionidae: Scolytinae and Platypodinae): a synopsis with three new species of Scolytinae, Zootaxa 5174 (1), pp. 1-24 : 10

Polygraphus major Stebbing

Polygraphus major Stebbing, 1903: 234 .

Recorded from Bhutan by Wood & Bright (1992). We have been unable to trace the original record, but it is highly probable that the species occurs in the country.

Distribution. Bhutan, China ( Xizang), India ( Himachal Pradesh, Punjab, Uttarakhand), Kashmir, Nepal, Pakistan.

Biology. This species attacks conifers in the genera, Pinus , Picea and Cedrus (Pinaceae) , but is particularly important as a pest of Pinus wallichiana in the Himalayan region ( Browne 1968). Its biology has been described by Stebbing (1914), Beeson (1961) and Khanday et al. (2020). Associated coleopteran predators are considered to be important in regulating population levels ( Khanday et al. 2016, 2018).