Lots of input on this one Jonathan. It seems that some labels say not to go
below a certain rate per acre. I am aware of at least one case where a
pyrethroid failed to control apple maggot. I agree that the OPs give more
room for error. It looks like pest management will get much more precise as
we get into "softer" materials in terms of timing, monitoring and rates.
Art Kelly
Kelly Orchards
Acton, ME
----- Original Message -----
From: "Jonathan B. Bishop" <jbbis...@comcast.net>
To: "Apple-Crop" <apple-crop@virtualorchard.net>
Sent: Friday, January 15, 2010 3:53 PM
Subject: Re: Apple-Crop: For Discussion: Pesticide Applications Rates and
Tree Row Vol...
Hi Art,
In our case we started our AM program July 1. While scouting the orchard
just prior to making the second application two weeks later, I observed
scary levels of adult activity, but I figured maybe I had washed out of
coverage or that these were newly emerged adults that weren't yet mature
and hadn't been killed by the Avaunt yet. I never suspected that the
material was not effective. Unfortunately, the story became clear as I
began to observe high incidence of egg laying in the fruit.
I believe that Avaunt is just a lot less effective against Apple Maggot
than I thought when I chose it from the list of control options. Since the
end of the season I have found four different insecticide trials that
showed Avaunt performing poorly against Apple Maggot. There could also
have been mitigating circumstances in 2009 not related to Avaunt that
contributed to the high incidence of damage. It was wet which aided
emergence of the Apple Maggot adults from the soil. The rain might have
impacted the insecticide cover on the tree canopy, etc... but DuPont
believes that by applying the TRV methodology in calculating the rate I
reduced the dose below what they say the product needs to be effective.
They could have referenced other factors but specifically blamed TRV for
the failure.
I believe that TRV is a method to express acreage as a volume of space.
DuPont only wants to recognize acreage as an area of land, regardless of
tree size. If an "acre" is a function of tree area I applied the full
rate. If an acre is an area of land only, then I did apply too little of
the product. As a practical matter, then how do we adjust our sprayers as
we go from block to block of different size trees?
Do you know what other products failed to control AM this past season, or
the circumstances surrounding the failures?
More growers than I expected are still using OP's like Imidan and I am not
aware of any control failures in orchards where OP's were used.
Regards,
Jonathan Bishop
Jill Kelly wrote:
Jonathan, you are not the only orchard to experience severe apple maggot
damage this past season. I don't believe any consensus has been arrived
at as to when or how. In some cases it has been felt to have been early
damage. In others it has mainly impacted later varieties such as
Cortland, Red Del, etc. In others use of pyrethroids has been implicated
or heavy rain wash-off.
Art Kelly
Kelly Orchards
Acton, Me
----- Original Message ----- From: "Jonathan B. Bishop"
<jbbis...@comcast.net>
To: "Apple-Crop" <apple-crop@virtualorchard.net>
Sent: Friday, January 15, 2010 1:39 PM
Subject: Re: Apple-Crop: For Discussion: Pesticide Applications Rates and
Tree Row Vol...
The timing to kill Apple Maggot is when the adult flies are present in
the orchard flying around and feeding but prior to oviposition. There is
currently no pupacide on the market and if there was we would be
applying it with a ground sprayer to the orchard floor, not an airblast
rig to the tree canopy.
Regards,
Jonathan Bishop
???????????????????????????????????????????????????????????
B.W. Bishop & Sons, Inc. Bishop's Orchards
1355 Boston Post Road Growers of Fine Fruit
Guilford, CT 06437 Since 1871
Vistit us on the web at: www.bishopsorchards.com
????????????????????????????????????????????????????????????
kborcha...@aol.com wrote:
I would think that because apple maggot over winter on the ground that
reduction of amount applied per acre in theory would result in a less
than proper amount of active material applied to control the pest.
The small to large house would not be as important as the fact that
each was on a one acre lot. Just my opinion and experience.
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Apple-Crop is not moderated. Therefore, the statements do not represent
"official" opinions and the Virtual Orchard takes no responsibility for
the content.
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<http://www.virtualorchard.net> and managed by Win Cowgill and Jon
Clements <webmas...@virtualorchard.net>.
Apple-Crop is not moderated. Therefore, the statements do not represent
"official" opinions and the Virtual Orchard takes no responsibility for
the content.
--------------------------------------------------------------------------
The 'Apple-Crop' LISTSERV is sponsored by the Virtual Orchard
<http://www.virtualorchard.net> and managed by Win Cowgill and Jon
Clements <webmas...@virtualorchard.net>.
Apple-Crop is not moderated. Therefore, the statements do not represent
"official" opinions and the Virtual Orchard takes no responsibility for
the content.
