Defects in Black Cherry Caused by Barkbeetles and Agromizid Cambium Miners
Abstract:Feeding of Phloleotribus liminaris (Harris), was the most important cause of gum defects in Prunus serotina Ehrh., at two areas in West Virginia. The beetles feed and overwinter in the living bark of healthy trees, causing gum defects in the wood and balls of gum on the bark. The gum spots in the wood were inter-ray and occurred mostly in the early springwood but in some cases in the late summerwood. Parenchyma flecks, of the type cause by Phytobia pruni (Gross.) were shown to be directly associated with gum defects. Such flecks occurred within the rings and generally increased in numbers with the height of the tree. The associated gum spots were inter-ray and usually were at the ends of the fleck on the bark side. Gum defects of cambium miner origin were easily distinguished from defects caused by barkbeetles by the presence of parenchyma flecks and the occurrence of the defect within the ring. On poor sites, gum defects (apparently caused by wounding, knots, and unsuccessful barkbeetle attack) were common within the rings that were not associated with parenchyma flecks. Descriptions and illustrations of the defects are given, and suggestions made for silvicultural and chemical control.
Document Type: Journal Article
Affiliations: Assistant Professor, Dept. of Entomology and Dept. of Forestry and Wildlife, Virginia Polytechnic Inst., Blacksburg
Publication date: 1964-09-01
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