White grubs affect pine plantations by killing some trees and by reducing vigor and growth of others. Light to moderate mortality only slightly affects timber yields and financial re- turns if the level of trees remains at the number required for full utilization of the site. Reduced height growth, however, lowers apparent site quality and substantially affects yields and financial returns. The 100 year projections suggest that greater product volumes, financial returns. and higher interest rates on the investment will be gained by grub control before tree growth is reduced.
Fowler, Richard F.; Wilson, Louis F.; and Lundgren, Allen L.
"Projected Red Pine Yields from Aldrin-Treated and Untreated Stands Damaged by White Grub (Coleoptera: Scarabaeidae) and Other Agents at Stand Age Ten Years,"
The Great Lakes Entomologist: Vol. 15
, Article 5.
Available at: http://scholar.valpo.edu/tgle/vol15/iss3/5