RE: [compost_tea] Pear Blister Mite

From: James Toler <willametteorganic_at_earthlink.net>
Date: Sun, 11 Jan 2004 09:05:25 -0800

Hi Judy

Rodale's Organic Plant Protection book recommends applying dormant oil just before the buds open in the spring to kill the mites that overwinter beneath the bud scales.

Jim Toler
Willamette Organics


----- Original Message -----
From: Judi Stewart
To: compost_tea_at_yahoogroups.com
Sent: 1/10/2004 4:10:25 PM
Subject: RE: [compost_tea] Pear Blister Mite


OK Elaine, here's the information on Pear Blister Mite.
In my case, it traveled from one tree to the other on the wind.

This web site shows exactly what they look like. Some
members thought they had scab because they had never
seen this before. I'm thinking to spray the trees with
horticultural oil and drench the soil past the drip line
with copious amounts of tea. But if
the mites aren't moving yet, perhaps I should wait.
What do you think?

Thank you,

Judi


http://www.msue.msu.edu/vanburen/fplbm.htm


Life History: In general, the eriophyids, upon hatching from eggs, pass
through two instars (stages) to become adult. The females (protogynes)
resemble the males. Some species, especially those infesting deciduous
hosts, have a second type of female, the deutogyne, that is the
overwintering stage. In some species, the deutogyne also move out and
aestivate (rest) in hot periods before overwintering. All known
eriophyids are plant parasites. There are no records of alternative
hosts nor convincing evidence of parthogenesis. Males do not mate with
females, but rather fertilization occurs from the contact of females
with sperm sacks laid down on the host by males. Up to 80 eggs per
female (3 to 4 per day) may be laid over a month or so. No eggs are
known to overwinter. Dispersal of these slow moving mites is by wind,
water, birds, insects, or humans. Commerce with plants is probably the
major agent in introducing mite species into distant, previously
uninfested areas. In the midwestern states, eriophyid mites have been
collected in sampling devices at 200 feet and greater elevations above
the ground.



-----Original Message-----
From: soilfoodweb_at_aol.com [mailto:soilfoodweb_at_aol.com]
Sent: Saturday, January 10, 2004 1:21 AM
To: compost_tea_at_yahoogroups.com
Subject: Re: [compost_tea] Pear Blister Mite

Hi Judy-

Well, I have no data at all on this one! Can you track down a life
cycle for the pest? It can't spend it's whole life in the leaf, so the
control point(s) is(are) someplace/time other than once the mite starts
causing damage.

So, if you track down the info on the life cycle, I'll be happy to
brainstorm with you on how to think through the possible biology.

OK?

Elaine Ingham
President, Soil Foodweb Inc.
SFI Corvallis, OR
SFI Port Jefferson, NY
SFI Lismore, NSW, Australia
SFI Hilversum, The Netherlands
SFI Cambridge, New Zealand
www.soilfoodweb.com






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Received on Sun Jan 11 2004 - 13:14:18 EST

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