Arborjet recommends a trunk Micro-infusion^TM of  IMA-jet (imidacloprid) insecticide using the Tree I.V. system and #4 Arborplugs using the Arborplug Technology. IMA-jet may be mixed with the micro-element supplement MICRO-jet Mixable. These two products together provide insect control and a tree health response in one treatment.  IMA-jet  provides 1-2 years of residual control. The Tree I.V. is designed to work effectively with the hemlock’s primitive tracheid vascular system. The Tree I.V. micro-infuses high volumes of product under low pressure resulting in efficient uptake. ACE-jet (acephate) can also be micro-infused for quick control, but does not provide any residual activity. ACE-jet is mixable with Arborjet’s micro-elements including MIN-jet Iron, and PHOSPHO-jet.

Generally, the best seasons for Micro-infusion^TM are fall and spring. Uptake occurs when trees are transpiring. The environmental conditions that favor uptake are moderate temperatures, adequate soil moisture, and high humidity.  Soil temperature should be above 40 degrees for micro-infusion™.  Tree health will influence uptake time.  Generally, hot weather or dry soil conditions will result in a reduced rate of uptake.  If treating trees in the summer, micro-infuse in the morning for the quickest uptake. A dying tree is a poor candidate for treatment.  It is the responsibility of the arborist or tree custodian to assess tree health and its potential for recovery before undertaking treatment. 

Micro-infusion^TM time varies depending on the season, time of day, environmental conditions, and tree health. The average uptake time for hemlock treatment is 30 minutes. Adelgid mortality may occur within 14-28 days and continue for up to 2 years. Cottony masses remain for some time, but will turn a tell tale gray color. Hemlocks respond to treatment with a resumption of growth.