Bill:
I am glad to hear that you can use carbaryl without concern for mite
build-up. I avoid carbaryl except for chemical
thinning, where it seems to be necessary for success with benzyladenine. If I
could not get potato leafhopper control
w/o carbaryl, I suppose I would use it.
David
On Nov 22, 2013, at 3:37 PM, Bill Beni <bill7kfa...@gmail.com> wrote:
> Here in Central Virginia this year we rotated Calypso with Carbaryl as
> populations settled in to our blocks. It worked great.
>
>
> On Fri, Nov 22, 2013 at 1:10 PM, David Kollas <kol...@sbcglobal.net> wrote:
> This past season I had continued re-infestation of potato leafhopper
> in young unbudded apple rootstock nursery. Calypso provided control, but only
> until the next population floated in on air currents, presumably from
> somewhere far south of here (Connecticut). My question is: Are these migrant
> populations subject to resistance development in the same way that local
> resident insect populations are?
> Evidently they are not resistant when they arrive, but to remain
> within label limits of product per season, other neonicotinoid products might
> be used to provide continued control. Is anyone aware of resistance having
> developed in this pest to neonicotinoids or other pesticides where the pest
> does not survive to pass on its resistance to the next generation?
> Does potato leafhopper migrate within, say, New England states, or
> within other Northern apple-growing regions during a growing season? If so,
> resistance might become a problem regardless of the pest's overwintering
> ability.
>
> David Kollas
> Kollas Orchard, CT
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