Evaluation of pine woolly aphid damage to Pinus patula and its effect on yield in Kenya
Date
1978Author
Mailu, AM
Khamala, CPM
Rose, DJW
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
It is reported in this further paper on the damage caused by Pineus pini (Gmel.) to Pinus patula in Kenya [see preceding abstract] that reduction in the elongation of the needles and stems occurs only after crown damage and aphid infestation become extreme. Lighter infestations are reflected in slight reductions of needle length. Damage to the trees and consequent losses of wood volume are most severe under warm dry conditions. Severely stunted needles caused by aphid feeding result in loss of half the tree yield. Infested stands may incur up to 5% economic loss in wood volume. These relations are, however, affected by site factors such as rainfall and altitude. With stands of P. patula at suitable sites. Pineus pini need not pose an important threat to plantations in Kenya.
Citation
East African Agricultural and Forestry Journal 1978, publ. 1980 Vol. 43 No. 3 pp. 259-265Publisher
Department of Entomology, University of Nairobi, Kenya