[NAFEX] Plum Curculio

Dennis Norton dmnorton at royaloakfarmorchard.com
Fri Jul 21 22:59:23 EDT 2006


We don't use the trap towers, but the small circle traps that are attached 
directly to the tree.  However, after coming across the following short 
article, I am planning on using the suggested technique that gave the better 
test results in thbe article next seaosn.

Odor-baited trap trees: a new approach to monitoring plum curculio 
(Coleoptera: Curculionidae).

Prokopy RJ, Chandler BW, Dynok SA, Pinero JC.

Department of Entomology, University of Massachusetts, Amherst, MA 01003, 

We compared a trap approach with a trap-tree approach to determine the need 
and timing of insecticide applications against overwintered adult plum 
curculios, Conotrachelus nenuphar (Herbst.), in commercial apple orchards in 
Massachusetts in 2002. All traps and trap trees were baited with 
benzaldehyde (attractive fruit odor) plus grandisoic acid (attractive 
pheromone). Sticky clear Plexiglas panel traps placed at orchard borders, 
designed to intercept adults immigrating from border areas by flight, 
captured significantly more adults than similarly placed black pyramid 
traps, which are designed to capture adults immigrating primarily by 
crawling, or Circle traps wrapped around trunks of perimeter-row trees, 
which are designed to intercept adults crawling up tree trunks. None of 
these trap types, however, exhibited amounts of captures that correlated 
significantly with either weekly or season-long amounts of fresh 
ovipositional injury to fruit by adults. Hence, none appears to offer high 
promise as a tool for effectively monitoring the seasonal course of plum 
curculio injury to apples in commercial orchards in Massachusetts. In 
contrast, baiting branches of selected perimeter-row trees with benzaldehyde 
plus grandisoic acid led to significant aggregation (14-15-fold) of 
ovipositional injury, markedly facilitating monitoring of the seasonal 
course of injury to apples. A concurrent experiment revealed that addition 
of other synthetic fruit odor attractants to apple trees baited with 
benzaldehyde plus grandisoic acid did not enhance aggregation of 
ovipositional injury above that of this dual combination. We conclude that 
monitoring apples on odor-baited trap trees for fresh ovipositional injury 
could be a useful new approach for determining need and timing of 
insecticide application against plum curculio in commercial orchards.

Dennis Norton
Royal Oak Farm Orchard
----- Original Message ----- 
From: "Jim Fruth" <jfruth at uslink.net>
To: <nafex at lists.ibiblio.org>
Sent: Friday, July 21, 2006 7:17 AM
Subject: [NAFEX] Plum Curculio

> To Dennis Norton,
>    From what I've been reading about trapping Plum Curculio, a lure/trap
> only works if the boles of the trees are painted white and the trap towers
> are positioned near the trees.  Apparently, the Curculios don't recognize
> the trees as plum trees if the boles are white.  Did you paint your tree
> boles white?
> -- 
> Jim Fruth
> Brambleberry Farm
> Pequot Lakes, MN
> www.bberryfarm.com
> Jams, Jellies and Syrups
> (218)568-8483 [Store]
> (218)831-7018 [My cell]
> This season we thought we would use the Great Lakes traps and lures on
> recommendation of our contracted entomologist.  Spent several hundred
> dollars and never caught a single PC but had plenty of fruit damage.  In 
> the
> past 15 years, Royal Oak Farm has never found a good trap and lure that
> works.  The good ole "shake the tree and see what falls" method has proved
> more valuable than any trap we have used.  We got more damage using the
> traps this year than ever before.  Next year, we go back to shakin'!
> For what it's worth!!
> Dennis Norton
> Royal Oak Farm Orchard

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