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Rick from Albany, Or writes

Is my tree a typical response for over a month after treatment with Merit 75 WP?

Tree was in early stage (class 2) infection. All branches are now drooping despite recommended watering and occasional green leaves are being lost. Drench treated a 50 ft., four trunk birch for bronze borer w/ Merit 2nd week of May.


With a systemic application of a product like Merit to the root zone, it can take a couple of weeks for a large to tree to complete aborb and have the ingredients translocate all the way through the plant. Some borers once they have started damage to a tree do such quick harm to it that the tree cannot be salvaged or saved even with the strongest insecticides. Below is a link to information on the bronze birch borer and the average timing, life cycle and treatments that can be used.

Answer last updated on: 07/03/2015

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