Schedule for aphid prevention

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Loon AuGres, MI(Zone 5b) Mar 29, 2006

I have a tri-colored beech that is prone to wooly aphids. I bought some Orthene. The tree buds are swelling now but it has not leafed out yet. When do I begin drenching the soil with Orthene and do I also mix and spray the branches? How often do I repeat? I'm also going to put ant bait boxes at the base of the tree. Is there anything else I can do to prevent the aphids from hitting this tree again?

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MaryMD7 Chesapeake Beach, MD Mar 29, 2006

Why orthene? I'd probably try a horticultural oil , or if the tree was small enough, maybe just regular rinsings with the hose in the summer -- or I'd just wait it out. If I were inclined to use pesticides, I would look at a pyrethrin or an imidacloprid systemic.

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Equilibrium Mar 29, 2006

The wettable/powder Orthene is a tad more discriminating than the Pyrethrin which dehydrates and kills insects that come in contact with it. When using wettable Orthene, only those bugs that actually feed on the tree will be affected. Predator bugs will be left unscathed for all practical purposes. Same deal with a horticultural oil but the issues with that would be that beneficial bugs can be smothered. If it's the aphids she wants to get at, I'd be a proponent of a wettable Orthene soil drench repeated in 10 days.

http://www.growersupply.com/orthene.html

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Loon AuGres, MI(Zone 5b) Mar 29, 2006

So should I start drenching the soil now or wait till it leafs out?

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Equilibrium Apr 01, 2006

I'd wait until it was at least half way leafed out. You might want to consider drenching it when there's rain in the forecast 24-48 hours after you treat. When you treat the second time, I'd go at 1/2 strength or rather 1/2 tsp per gallon. Really sorry I missed your post back here. Would you please come back and take a moment to post here about a month or so after your second application to share how you believe the Orthene performed? I've never treated an outdoor tree with Orthene.

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ViburnumValley Scott County, KY(Zone 5b) Apr 01, 2006

And always remember:

It's a violation of law to use the pesticide contrary to the label instructions, no matter what you read on websites or hear over the garden gate.

These chemicals are designed to be lethal to the labeled pests on the labeled plants when used in accordance to the label directions. Non-target organisms (including people and pets) can be affected when one deviates from these directions.

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Equilibrium Apr 01, 2006

http://www.growersupply.com/orthene.html
http://www.cdms.net/manuf/mprod.asp?mp=5&lc=0

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