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Kent from St. Louis, Mo writes

What time of year should Merit 75 WP be applied to kill boring insects in globe locust trees?

Location: St. Louis, MO. Plan to use soil drench method. Thinking about using this product now (early November, if it'll do any good) and Safari via basal trunk application in spring.

Answer:

Merit should be applied when the tree is actively growing. If you try to apply a systemic product like Merit to the root system when the tree has gone dormant it will not be able to trans-locate through the tree. Instead you should consider using a topical product such as Tengard to stop new insects from invading the tree. Tengard can be sprayed on the bark and the foliage to kill exposed insects before they invade the tree.

Answer last updated on: 11/10/2012

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