Skip to main content

Defoliation by the Needle-shortening Pine Gall Midge, Thecodiplosis brachyntera, on Pines in Central Sweden

Buy Article:

$55.00 plus tax (Refund Policy)

An outbreak of the needle-shortening pine gall midge, Thecodiplosis brachyntera, occurred on Scots pine, Pinus sylvestris (L.) and lodgepole pine, P. contorta (Dougl.) in central Sweden during 1995-1998. The larval feeding of T. brachyntera kills current-year needles and heavy infestation causes severe defoliation. A pattern of fluctuating defoliation among years and sites was found on both pine species. Defoliation was evenly distributed in the crown of P. sylvestris during years of high as well as low infestation; apical whorls had as much defoliation as basal whorls. In P. contorta, however, there was a tendency for defoliation to be concentrated on branches in the most apical whorls. Growth ring increments on P. sylvestris with high levels of defoliation (71%) did not differ from trees with moderate levels (26%) of defoliation. Shoot lengths were significantly shorter, however, on heavily infested trees the year after defoliation.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: ASSOCIATIONS; CECIDIOMYIIDAE; CONTORTA; DEFOLIATION; DIAPAUSE; DIPTERA; EXTENDED; HOST; INSECT; LARVAL; NOVEL; OUTBREAK; PINUS; PLANT; SYLVESTRIS; VIGOUR

Document Type: Research Article

Publication date: 01 April 2002

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more