Study on intensity of damage on teak caused by beehole borer at Mae Gar teak seed orchard, Phayao province
2000
Thavee Chairuangsirikul(Royal Forest Dept., Bangkok (Thailand). Forest Research Office. Silviculture Research Div.)
Study on intensity of damage on teak (Tectona grandis Linn.f.) stems caused by beehole borrer (Xyleutes ceramicus Walker) was investigated in the 1965 teak clonal seed orchard at Mae Gar Seed Orchard, Phayao province. The orchard, consists of plus trees from 16 clones. The results were shown as below. The average values of DBH., height, damaged rate and infestation rate of 33 year old trees in Teak Clonal Seed Orchard were 37.9 cm, 21.8 m, 55.8 percent and 4.6 holes/tree, respectively. Clones of plus trees selected from plantation had higher average dbh (40.9 cm), height (22.6 m), damaged rate (73.9 percent) and infestation rate (6.9 holes/tree) than that of clones selected from natural forest (36.5 cm, 21.5 m, 47.3 and 3.2 holes/tree). The average values of infestation rate at each stem section level (ie. LT 5, 5-10, GT 10 m) were 2.4, 2.1 and 0.2 holes/tree, respectively. The east direction was attacked by beehole borer more than the west direction. Clone number V22 has the best quality in term of wood texture, because of dbh, damaged and infestation rates are very low (average 33.9 cm 21.7 percent and 0.3 holes/tree), whereas the clone number V27 and V26 are ranked as the second and the third, respectively.
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