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Case Study: Microinjection to Protect Trees From Oak Wilt

Microinjection using Chemjet Tree Injectors and the fungicide propiconazole were used to successfully arrest an outbreak of oak wilt in a densely wooded area in Northern Michigan without the need for trenching around the infected trees. Oak Wilt was identified with several adjacent dead and dying red oaks in a localized area.

Chemjet Tree Injectors were used to inject a propiconazole solution at a rate of 10 ml of 14.3% propiconazole per inch diameter at breast height (DBH). A solution of 50% propiconazole 14.3 plus 50% tap water was mixed and 20 ml of this solution (containing 1.56 grams propiconazole) was injected using Chemjet Tree Injectors at three inch intervals around the circumference of trees about two feet above ground.


Twenty  healthy red oaks ranging in diameter from 8 to 24 inches were injected in all directions radiating outward to a distance of about 100 feet beyond oak wilt infected trees during August 2016.

Six infected and dying red oaks within in the outbreak area were then cut down in September 2016.

As of September 2017, thirteen months after treatment, no new infections of oak wilt have been identified in any of the treated trees. The photo below shows the stump of an oak wilt infected and removed red oak, with healthy red oaks immediately adjacent to the killed tree. Treated trees have red dots.



Below:  View of healthy treated tree tops immediately adjacent to oak wilt killed tree stump shown in photo above



While it is premature to conclude that the oak wilt outbreak has been eliminated, it is encouraging to see that the fungus has not transferred to any adjacent red oaks (some only five feet away) after a period of one year. Propiconazole microinjections will be conducted for trees in this treatment area in 2018 and 2020. If no new oak wilt infections are identified by 2022, then injections will cease.









For information on how to treat other tree diseases and pests check out the links below:

Buy Chemjet Tree Injectors Now


How Chemjet Works

Oak Wilt Disease and Treatment

Save Your Trees from Oak Wilt

Emerald Ash Borer Treatment

Hemlock Woolly Adelgid Treatment

Sudden Oak Death Treatment

Asian Longhorned Beetle Treatment

Plugs for Tree Injection Holes

Chemjet Tips and Tricks

Video: Injecting for Oak Wilt

Video:  Chemjet use in Australia

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