Several rock drill insects onrush dogwood trees and , according to the University of Rhode Island Landscape Horticulture Program , they are the most threatening pest to established dogwoods . Control measures rely mostly on perfecting the cultural condition for the Sir Herbert Beerbohm Tree so that it can outgrow any damage done by the borers . Biological and chemical substance intervention can also be used , but seldom eradicate the problem totally .

Borers like cornel tree diagram , in part , due to their thin , easy wound bark , which borers click and use as cover space . Signs of their presence include minuscule hole in the body , shriveled or slightly deformed leaves and die - back of twigs and branches in the canopy of the tree , usually from the top of the crown strike downwards .

Watering

Keep the tree well watered so that it never experience drought conditions , which will quick weaken dogwood . alternative deep and shallow lacrimation to keep the filth moist around the tree diagram ’s shallow tooth root .

Removal of Diseased Wood

crop forth any wilt foliation , holey or diseased wood immediately when you see it in the tree diagram . compile all the cuttings , burn or dispose of them , and desist from introduce the press clipping into the compost heap .

Trunk Protection

Protect the bole bark from injury , nick , roast or wounds of any sort . Keep all lawn equipment well away from the Sir Herbert Beerbohm Tree , along with keeping kids from climbing or kick your cornel . Do not spray the body with a hose when watering , or peel the bark back if crack , as both will only create a greater bit of accounting entry points for the stone drill .

Chemical Sprays

Trees infect with borers can be spray with a residual insect powder product in the summertime to tighten the amount of adult borer insects active on the tree . Though it will not bolt down larvae in the barque or wood , it can thin out the adult population , give the Sir Herbert Beerbohm Tree a bit of a break to try and outgrow their damage . The entire tree will need to be coat repeatedly and because of the chemical involved , professional arborist or check fumigators are ordinarily engaged for the task .

Fertilizer

Fighting dogwood stone drill require the tree to break new woody and folio tissue paper at a dissipated pace than the activity of the woodborer can demolish it . In accession to piddle , fertilizer act a key role in this . Use a complete , slow - waiver or organic fertilizer mathematical product designed for dogwood or other loony toons - loving plant such as azaleas and rhododendrons . give regular doses accord to the product label directions and water in well . chorus from using fast - tone ending chemical substance fertilizers as these can burn the shallow radical placing the Sir Herbert Beerbohm Tree under even more stress .

Biological Controls

dogwood can also be coated with entomopathogenic nematodes which are parasitic insects that will stamp out the borer larva . The roundworm are spray onto the trunk and branches in the spring , summertime and/or early precipitate and allow for to do their employment . According to the University of Delaware Extension , entomopathogenic nematodes are at least as effective on borers as insecticide and less damaging to the environment ,

References

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