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Oriental Fruit Moth and Permethrin

Posted by austransplant MD 7 (My Page) on
Sat, Jun 8, 13 at 12:24

Hi all,

Every year my nectarine gets hit hard by oriental fruit moth. I spray with permethrin, and yet the next day I still see lots of OFM strikes. Is permethrin effective on these pests? Perhaps the concentration is too weak? I've been using Bonide 8 spray concentrate, which is 2.5% permethrin, mixed at 4 tablespoons (2 oz) per gallon, per instructions on the label. Is this just too weak? How do you control OFM?

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RE: Oriental Fruit Moth and Permethrin

  • Posted by olpea zone 6 KS (My Page) on
    Sat, Jun 8, 13 at 20:48

I don't use permethrin, but know of a peach grower in the area that alternates permithrin (Pounce) and Imidan in his summer spray program. Claims he gets excellent results.

If you are seeing "strikes" the day after you spray, it's likely the eggs had already hatched into larva and penetrated into tissues before you sprayed, thus protected from your spray.

Once eggs are laid, it takes 5-21 days for them to hatch (depending on temps). Permethrin is supposed to kill eggs on contact, but not larva that have already tunneled in fruit or shoots.

I don't know how often you spray, but if not that often, tightening your spray interval might help.

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