hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
 Navigation
Articles
Gallery of Plants
Blog
Tech Blog
Plant Profiles
Patents
Mailing Lists
    FAQ
    Netiquette
    Search ALL lists
    Search help
    Subscription info
Top Stories
Links
sHORTurl service
Tom Clothier's Archive
 Top Stories
Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

Unauthorized use of a plant doesn't invalidate it's patent

RSS story archive

Re: CULT: Murphey's and Borer


Having battled borers in the midwest and here in the upper south for more than 30 years, I have seen my share of them. As I mentioned in my recent post (same subject), I used Cygon for many years and found it very effective. I agree that a systemic is what is needed to kill them. What may not be so clear, however, is how they operate and what that has to do with their vulnerability.

The borer moth is a night flyer, which is why it is seldom seen. As John mentions, it lays its eggs in the detritus around the base of the plant. That may include within the leaves at the base of the fan, which scrupulous cleaning of the bed still won't reach. When the critters hatch, they are microscopically small, and they crawl up the leaf toward its tip, where they begin chewing at the edge of the leaf, going downward, until they actually enter the leaf and continue eating their way toward the rhizome, getting bigger all the time. The method of spotting the borer in the fan and killing it by pinching the fan has been described and even illustrated in, I think, the Bulletin! If not, then it was the Region 4 newsletter. The piece starred Clarence Mahan as the Executioner. (I think I even recall simulated sound effects.) While this method of eliminating the enemy may be personally satisfying to some, I have never mastered it and am not particularly attracted to it anyhow. Which is not to say that, if I spot a borer at that advanced stage, I won't attempt it! The thing is, when things have reached that stage, untold numbers of the infiltrator's cohorts are busily boring away in other clumps. So, we want to get them earlier. The borer eggs will hatch, I am told, when the first warm days of late winter arrive. I believe it, based on experience. That's usually late February here. In Indiana, it was early March. So, that is when I apply either Cygon (in days past) or the Merit (nowadays). I only do it once. I also do not spray against the borer in the fall, because I'm convinced that the treatment is only effective on the larvae, not the eggs.

All of the above said, I should mention that I believe there is a second borer hatch that occurs in late May or early June. That is because I have found tiny borers in the iris after pods have developed. I think Charlie Nearpass believed that, too, since he sprayed his seedlings with Cygon while they were in bloom. I can't bring myself to do that. Try it, if you wish, and you'll see some sick puppies for a few days. I think you might use Merit without that staggering effect, but I haven't felt I need to try it yet. -- Griff


----- Original Message ----- From: "John I Jones" <jijones@usjoneses.com>
To: <iris@hort.net>
Sent: Saturday, February 11, 2006 2:43 PM
Subject: Re: [iris] CULT: Murphey's and Borer


Being in borer free country, I don't have much knowledge of their life cycle, but as I understand it, they eat their way down in side the leaves and through the rhizome and out into the ground. There they metamorphcize into the moths that then lay their eggs on the leaves/detritus around the plant. The eggs hatch and they start crawling around looking for leaves to eat.

Seems that the oil might be effective in smothering the eggs (fall/spring application) and perhaps the small first stages of the worm/caterpiller/borer (spring application)

Musings from the uninformed.

John


On Feb 11, 2006, at 11:26 AM, Michael D. Greenfield wrote:

I do not see how the oil would smother the borers as they are inside the leaves or rhizomes. The reason contact chemicals do not work. Poison put on the outside of the leaf do not work either. They seldom eat the outside of the leaf. It has to be something absorbed by the plant such as Cygon or Merit. Merit granules have not worked for me. I plan to use the liquid this year.

I sprayed Cygon in 1999 and found the first two borers in 2004. When digging in 2005 quite a few were found. Before 1999 I had a ton. The old wife's tale of one borer per rhizome is untrue. I have seen as many as 50 in a two year old clump. A friend had that clump and we marked it so I could get a start. There were none left just rotting iris and a churning mass of borers. Have not seen anything like it since. I have found two borers in one rhizome since. Quite a few times.

I have a small garden so good clean up spring and fall is not hard. usually dig every two years and do row couture. Planting in beds with other flowers makes borer control harder. Growing Spurias and Siberians gives borers a place to hide and place leaves as they are not dug as often. Plus good clean up on Siberian is almost imposable.

The first borer I ever found was a full grown one eating a bee pod on a 40" + stalk. I have never seen that since. I dug everything and found a lot more. If borers were on the west coast I am sure there would be studies done to find out better controls.

Mike Greenfield

----- Original Message ----- From: "John I Jones" <jijones@usjoneses.com>
To: <iris@hort.net>
Sent: Saturday, February 11, 2006 11:13 AM
Subject: Re: [iris] CULT: Murphey's and Borer


If it is the oil that kills the borers (I imagine by suffocating them) then perhaps a good solution (no pun intended) would be SunSpray Ultra-Fine Oil. It is an ultra refined parafinc oil. I use it here in California to control Whitefly. Pests don't develop an immunity to it because of the way it works. Non-toxic.

http://www.sunocoinc.com/market/ultrafinef.htm

They don't list any borers o\r the like, but that just means they haven't tested it.

John




On Feb 11, 2006, at 7:27 AM, George Schubert wrote:

Murphy's sounds good, obviously much cheaper than the Merit granules or spray, and probably better for the environment. Having said that, we must remember to reapply weekly and after rains, else bad things happen. For me, I know that bad things would happen.
At 10:10 AM 2/11/2006, you wrote:
In a message dated 2/11/2006 10:05:21 AM Eastern Standard Time,
Autmirislvr@aol.com writes:

1/2 cup of Murphy's Oil Soap to 1 gallon water.

Weekly sprayings commencing prior to the appearance of the first borers and
continued through bloom season. Reapply after rain. Use in conjunction
with
good cleanup.

Thought I'd pass this along!





Actually l, remebered \ this last week when I was swabbing the floors around
here. This was alsom mentioned on the list.

Did anyone ever try this? I recently heard one of the horticultuists--and
she actually is a pro--at the local greenhouse recommend a dilute Murphey's
solution to a woman who had cooties on some houseplant. I'm still asking if
anyone hass ever tried a light dormant oil on the irises for borer, which amounts
to the same thing, I guess. Or does it? Is it the soap part of Murphey's
which is doing the deed, if the deed is being done, or is it the oil residue, or
is it both?

Cordially,

Anner Whitehead
Richmond VA USA USDA Z7

-------------------------------------------------------------------- -
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS



John                | "There be dragons here"
                         |  Annotation used by ancient cartographers
                         |  to indicate the edge of the known world.

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS



John                | "There be dragons here"
                         |  Annotation used by ancient cartographers
                         |  to indicate the edge of the known world.

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS


--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006
---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS



Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index



 © 1995-2015 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement