As I understand it, the Kaolin powder elicits a grooming response in the adult moth, often deterring her from laying at all. There may be something to the powder interfering with the newly hatched caterpillars, also. The powder and physical barrier seem to work best in concert.
This year I hope to build nest boxes for violet-green swallows with the entrance 3/4" tall by 1 1/4" wide to keep house sparrows at bay. Each can be built from a 1 x 6" rough cut cedar plank - no perch in front. I'll put 'em just below the eave out back. Swallows may do a better job of coddling moth patrol than can I. If it works, I'll be cleaning next boxes each fall and putting them up each spring once the swallows arrive.
Naomi: if the worm is already present in the applet you wrap, once it reaches maximum size it will chew its way out to pupate in the ground. When I put the footies on, I look each applet over for a tiny puncture mark. any with one gets thinned away and removed from the property.
Dave Liezen
----------------------------------------
> From: naomi@oznayim.us
> To: nafex@lists.ibiblio.org
> Date: Fri, 1 Apr 2016 08:03:57 -0600
> Subject: Re: [nafex] In the bag
>
> I did not use the kaolin with the footies here in Idaho. Something bit an
> insect sized hole right through the footie and I had plenty of coddling moth
> damage. Gave the footies to my sister in MA where hopefully the bugs are
> less aggressive.
> Naomi
>
> -----Original Message-----
> From: nafex [mailto:nafex-bounces@lists.ibiblio.org] On Behalf Of david
> liezen
> Sent: Thursday, March 31, 2016 9:34 PM
> To: North American Fruit Explorers
> Subject: [nafex] In the bag
>
> I've used nylon footlets w/Kaolin from Home Orchard Society (order on their
> website) the past five years or more. It takes some time but I don't have to
> mess with them again until a few weeks before the fruit is fully ripe, when
> I carefully remove the li'l bags to allow better color to develop. 90% or
> better success rate except with Liberty, which seems to be a codling magnet
> and I got about 75% success with that. ( I speak of Liberty in the past
> tense because I sold it to make room for Hunt Russet.)
>
> Dave Liezen
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