Growth Loss in Sapling Ponderosa Pine Associated with Injury Caused by Gouty Pitch Midge : Insects Affecting Reforestation. Biology and Damage

1989

S. 196-204

3 Tab., 9 Lit. Ang.

Unselbständiges Werk

200069386

Tagungsberichte / IUFRO 1989, S. 196-204

In a case history using paired-comparison tests of annual height growth and shoot injury, growth loss in sapling ponderosa pines in northern California was associated with injury caused by the gouty pitch midge. Trees with resinous surfaces on their elongating spring shoots were repeatedly inkured by the midge. Of three different expressions used to compare height growth of midge-injured and uninjured trees, internode length was judged most appropriate because its results were simplest to interpret.