Western Pine Shoot Borer (Lepidoptera - Olethreutidae) Response to Site Preparation in Ponderosa Pine Plantations

1989

S. 543-547

1 Abb., 2 Tab., 21 Lit. Ang.

Unselbständiges Werk

200042743

The effects of six site preparation on western pine shoot borer, Eucosma sonomana Kearfott, infestations were compared during the fifth through the eigth growing seasons after planting at three sites in southcentral Oregon. Treatments herbicide spraying followed by disking. Treatments that produced the greatest reducton in competing vegetation resulted in the best pine growth but also in the highest levels of E. sonomana infestation. Trees that were attacked by E. sonomana were significantly taller at the beginning of the growing season than trees that remained uninfested. The effect of E. sonomana infestation on height growth of ponderosa pines, Pinus ponderosa Douglas ex Laws., showed a significant interaction with total height of the pine trees at the beginning height increased. The results of this study illustrate the importance of incorporating pest management considerations into overall forest management plans.