CULT: review of iris borers and nematodes
- Subject: CULT: review of iris borers and nematodes
- From: L* M*
- Date: Tue, 24 Nov 1998 14:04:03 -0800
From: Linda Mann <lmann@icx.net>
In response to an email from Clarence Mahan about successful use of
nematodes to control iris borer (via Kathy G), I rooted around in the
archives and came up with the following annecdotal/research results.
There were nearly 200 posts on the subject, so I may have missed a few.
Several people posted that they were going to try nematodes, but I only
kept the ones who actually had tried them.
Dan Isbell. Kansas City, Kansas Zone 5 izzy@sound.net successful for 6
years (without reapplication?) Scanmask: a large strain of Steinernema
carpocapsae, similar in appearance to S. feltiae, that remains active
down to 50 F. First collected near the arctic circle in Sweden
June 22, 1997 8:53PM Nancy Gildart south of Chicago. New treatment,
Gardens Alive
Leslie Jobe's Omaha NE club member, successful, one year, Gardens Alive
Univ. Md. Research Steinernema carpocapsae (known as Sc) and
Heterorhabditis bacteriophora (known as Hb) were quite effective
(87-100%). S. carpocapsae was the best
Chris Hollinshead e-mail: bu336@torfree.net Mississauga, Ontario Canada
Near Toronto, Ontario Canada RBG (Royal Botanical Gardens) beneficial
nematodes successful (?yrs?) large iris display garden.
Stephanie Markham smarkham@meridianmktg.com, Massachusetts successful 3
yrs, annual spring application, Gardens Alive! the nematodes are not
winter-hardy here
Bill Shear <BILLS@hsc.edu It is true that nematodes applied one year do
not winter over to the next
Ginny Winterberry Gardens zone 6 northern Virginia Vspoon@aol.com
successful ?1 yr? Gardens Alive. one person told me that nematodes
(like milky spore for grubs) will not survive our winters. Another told
me they are perfectly hardy and will colonize.
Steinernema carpocapsae lives closest to rhe soil surface.
Heterohabditis heliothidis ranges deeper in soil. As temperatures drop
the nematodes burrow deeper into the soil and rise as the temperatures
do but their return lags behind the arrival of early spring pests.
Spring application has worked for everybody who has told us of their
experiences on list, though Clarence said in his note to me that they
did not work for him.
Any other success or failures out there to report?
Linda Mann east Tennessee USA
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