North American Fruit Explorers mailing list at ibiblio

["Ed Fackler" <ed.fackler@gmail.com>]

Jim:

 

     Shuck split (in peach anyway) is the time when the fruit expands (approx 10 mm) enough to cause the flower base (shuck) to split and fall off.

 

     Re: the incidence of curculio egg laying (creating the typical "cat face" scare on fruit) has more to do with day time temperatures than fruit development (although they do coincide).  Or in So. Indiana when temps were 70 or greater curculio activity rapidly increased.  I consistantly saw this each and every year.  I'd always leave 2 trees (at different locations) unsprayed simply to monitor pest damage through out the seasons.

 

ed

 

On 4/21/07, Jim Fruth <jfruth@tds.net> wrote:

   What does "shuck split" mean?

The critical timing period for plum curculio has historically been at fruit
set just as the fruit begins to swell. However, recent research has shown
that plum curculio females are reproductively mature well in advance of this
stage. We estimate 95 percent of the females are mated after 290 GDD50,
which is typically right at shuck split in stone fruits and fruit set in
pome fruits. Females are ready to oviposit long before fruit are large
enough to support the developing larvae.

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