Flora Library
Search for emergence holes host:gardenline.usask.ca
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emergence holes host:gardenline.usask.ca
Listing 1 - 2 from 2 for emergence holes
birch leaf miner birch betula russell friesen weeping form tree health european birch high water darkened material european weeping birch bleed sap river birch soil water aeration holes borer larvae water applied
Bronze Birch Borer
... induce drought conditions. The damage, these birds cause, may result in top dieback if their holes girdle the trunk. Birch trees should be watered quite heavily in late October, so that ... signs to look for are the ridging of the bark and the adult's "D" emergence holes. Trees with a great deal of dieback from the bronze birch borer should be removed ...
gardenline.usask.ca
Guide to Birch Trees
... Where a tree is growing on heavy soils, aeration holes will help maintain root vitality. These holes can be made with a garden fork, or ... may also induce drought condition, resulting in top dieback if their holes girdle the trunk. Once a birch tree is infested by the ... infestation (the ridging of the bark and the adult's "D" emergence holes). Trees with a great deal of dieback from the bronze birch ...
gardenline.usask.ca