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
___
apple-crop mailing list
apple-crop@virtualorchard.net
http://virtualorchard.net/mailman/listinfo/apple-crop
___
apple-crop mailing list
apple-crop@virtualorchard.net
http://virtualorchard.net/mailman/listinfo/apple-crop
