EXEL Systemic Fungicide

amideutch · April 29, 2009

Came across this product on the web. It's a systemic and contact fungicide and the primary ingredient is Mono- and di- potassium salts of phosphorous acid. It's EPA registered and NOT on the PAN Bad Actor Product list. Here are some links concerning the product. Ami

http://www.pesticideinfo.org/Detail_...DIST_NR=070179

https://www.vermontbean.com/dp.asp?c...8409681164B%7D

http://www.organiclabs.com/organic_l...el_product.htm

Suze · May 27, 2009

Belated response - but Ted, thanks for posting about this. I saw it earlier, but didn't get around to commenting, 'tho I meant to. If you hear anything else about this product and have more info to share (whether anecdotal from growers or studies), please update and add to the thread. I would most definitely be interested in further information.

From what I can gather, this is touted to be an organic, yet systemic fungicide approved for tomato crops, is that correct? Sounds like it from your comments above, and also the links ...

amideutch · May 27, 2009

Suze, I came across this product on the net last year but didn't pursue it as it was not available at the retail level. But now it is. Need somebody in the US that has reoccurring fungal problems to give it a try.

jcmorse33 · May 29, 2009

This looks interesting, since I get lots of foliage diseases in my neck of the woods. But I am curious why the manufacturer doesn't list it as being for use on vegetable crops. They do list turf grass, fruit trees, and ornamentals... any ideas?

amideutch · May 29, 2009

jc, if you go to the first link I gave, pesticide info.org it will bring up the listing for EXEL LG or the EPA designation which is "Agri-fos. If you look down the page to "Registered Uses" you will see tomatoes listed for foliar and soil treatment along with several other listings for vegetables, fruit trees etc. I also asked the question to the folks at Organic Laboratories that make the product. Will pass back when I get a reply. Ami

amideutch · May 30, 2009

Here's a link on EXEL (Agri-fos) regarding use on vegetables. Ami
http://www.lsuagcenter.com/NR/rdonly...densLOWRES.pdf
http://www.ent.uga.edu/labels/fun/agri-fos.pdf

amideutch · May 30, 2009

More info. Ami
Phosphorous Acid Fungicides Explained
by John Hartman and Kenny Seebold,
Extension Plant Pathologists
Kentucky fruit and vegetable growers may
have noticed that phosphorous acid has been listed for
management of several fruit diseases in recent
editions of the commercial tree fruit and small fruit
spray guides and management of several vegetable
diseases on recent product labels. Some County
Extension Agents and growers have been curious to
know how they work. Parts of the following material
was adapted from an insightful article written by
Annemiek Schilder, Michigan State University Plant
Pathologist, and was published in the Michigan State
University Fruit Crop Advisory Team Alert, Vol. 20,
No. 5, May 10, 2005.
Phosphorous acid fungicides
Recently, a number of new fungicides that
have phosphorous acid as the active ingredient have
come on the market. Other names sometimes used
for this group are phosphonates or phosphites.
Commercial products in this group may include
ProPhyt®, Phostrol® and Agri-Fos®. Aliette®
(fosetyl-Al), an older fungicide, is the prototype for
this group of fungicides. However, the long-standing
patent on Aliette® had prevented similar fungicides
from being developed until recently. In Australia,
where the patent did not apply, growers have been
using the phosphorous acid fungicides for over a
decade.
Phosphorous acid is not fertilizer. The term
“phosphorous acid” should not be confused with
phosphoric acid or phosphorus (P), a fertilizer
component. In fertilizers, P is normally found in the
form of phosphoric acid (H3PO4), which readily
disassociates to release hydrogen phosphate (HPO4-2)
and dihydrogen phosphate (H2PO4
- ). Both of these
ions may be taken up by the plant and are mobile once
inside the plant. Phosphorous acid is H3PO3. A single
letter difference in the name of a chemical compound
can make a major difference in its properties.
Phosphorous acid releases the phosphonate
ion (HPO3
2; also called phosphite) upon
disassociation. Phosphonate is easily taken up and
translocated inside the plant. Phosphorous acid does
not get converted into phosphate, which is the primary
source of P for plants. Because phosphorous acid
and its derivatives do not get metabolized in plants,
they are fairly stable and probably contribute little or
nothing to P nutritional needs of the plants.
Some researchers have investigated the
ability of phosphorous acid to act as a nutrient source
for plant growth and found that P deficiency
symptoms developed with phosphorous acid as the
sole source of P. This means that although
phosphorous acid can control diseases, it is not a
substitute for P fertilization. The inverse is also true:
phosphate is an excellent source of P for plant
growth, but is unable to control diseases other than
improving the general health of the crop. So applying
high amounts of P fertilizer will not work as a
disease control measure.
Diseases managed with phosphorous acid.
Researchers have found that phosphorous acid
fungicides are especially effective against Oomycete
pathogens, such as Phytophthora, Pythium, and
downy mildews in a number of crops. Our fruit
spray guides list Phytophthora collar rot and root rot
of tree fruits, blueberries, and brambles; strawberry
red stele and leather rot; and grape downy mildew as
targets for phosphorous acid fungicides.
Phosphorous acid is labeled for use on brassicas
(broccoli, cabbage, cauliflower); cucurbits; edible
legumes; Solanaceous crops (eggplant, pepper,
potato, tomato, and tobacco); onions; and a number
of leafy vegetables for management of diseases
caused by Phytophthora, Pythium, Rhizoctonia, and
Fusarium spp. Downy mildews of these crops are
also listed on product labels. Materials containing
phosphorous acid, in general, have performed best
against Phytophthora blight and downy mildews.
Preventive applications were more effective in
reducing season-long severity of disease than those
applied after disease onset.
Phosphorous acid has a direct and possibly
an indirect effect on these pathogens. It inhibits a
particular metabolic process (oxidative
phosphorylation). In addition, some evidence
suggests that phosphorous acid has an indirect effect
by stimulating the plants natural defense response
against pathogen attack. This probably explains the
much broader spectrum of activity observed in many
fungicide efficacy trials. In fruit crops, it has been
found, for instance, that ProPhyt had efficacy against
downy mildew, Phomopsis cane and leaf spot, and
black rot (but not much against powdery mildew) in
grapes. There is also evidence of activity of these
compounds against anthracnose in blueberries.
The phosphonate ion is highly systemic and
fairly stable in plants. The systemic activity allows
them to be applied as foliar fungicides for prevention
of Phytophthora and Pythium root rots. They may
also display some curative activity. In general,
applications every 14 days seem to be effective in
grapes, but follow label directions. These fungicides
are sold as solutions of potassium and/or sodium
salts of phosphorous acid. To compare them, one
should look at the phosphorous acid equivalent,
which should be listed on the label.
Fungicide precautions. Phosphorous acid
fungicide prices range from about $25 to $35 per
gallon, and the application rate ranges from 2 to 5 pt/
acre ($6.25 to $22 per acre, depending on the
product and rate). Under high disease pressure,
higher rates may need to be used and spray intervals
tightened. These fungicides are formulated in salt
form, so care must be taken not to exceed a certain
concentration, as crop injury may result. In addition,
if the concentration is too high, the pH may become
so low that in tank mixes with copper products
(particularly copper hydroxide such as Kocide), too
much copper will become available and result in crop
injury.
Pawpaw Tasting Highlights
Kentucky State/Pawpaw Foundation
Workshop
by Kirk W. Pomper, K.S.U., USDA Pawpaw
Germplasm Repository, Frankfort, KY
The Kentucky

chalstonsc · June 11, 2009

Ami-and others...

Thanks for the info. Ami, from what I'm reading, the Agri-Fos is listed for late blight and root rot. My issues seem to be a variety of fungal leaf ones beyond late blight. Am I missing something or do you know if it would work for a broader variety of fungal leaf problems?

amideutch · June 11, 2009

Can you be a little more specific than "ones beyond late blight". Ami

Blueaussi · June 11, 2009

Quote:

Originally Posted by chalstonsc

My issues seem to be a variety of fungal leaf ones beyond late blight.

*nods*

South Carolina, the Great Mildew State. We got yer fungi right here!

chalstonsc · June 11, 2009

Ami-
Blueaussi is right to the point!

I've got some early blight, leaf mold, septoria leaf spot, ....not to mention bacterial speck and bacterial spot....all aided by a vicious infestation of flea beetles!

amideutch · June 12, 2009

charlston, If you go to my first post and the first link, pesticideinfo.org and go to the Registered Uses in the U.S. for Agri-fos and go to Pests I think it about covers most of what you listed. Actinovate is another excellent fungicide that works above ground as well as below ground. Here's a link on flea beetles. Ami

http://www.planetnatural.com/site/xd...e-control.html

chalstonsc · June 12, 2009

Ami-
Thanks!

Suze · April 1, 2010

I ordered some Exel LG a couple of days ago to try out. On its way.

Any updates, comments, or general tips for use other than just following the label instructions?

For those of you who used it last year (Ami, Ray, ?), how well did it seem to work at preventing or controlling foliar fungal disease?

amideutch · April 1, 2010

Sue, as I used Agri-Fos, also called Exel LG in addition to Azoxystrobin and Actinovate I can't really say which was the standout as I used them as a team. Actinovate was used primarily for soil disease where I mixed it with Mycorrhiza in one gallon of water and dipped my plants into the solution prior to planting. I did make 3-4 foliar applications during the course of the season mixed with T&J's Microbe Tea.
I used Azoxystrobin and Agri-Fos alternately during the course of the season for foliar disease and application was based mainly on the weather conditions anywhere from weekly to every other week. One thing I did come across was that Agri-Fos (EXEL LG) should not be applied with "Spreader-Stickers". And yes my plants were disease free for the most part the whole season. If you are interested in azoxystrobin here is a link and I have read that mixing it with Daconil is recommended for enhanced effectiveness. Ami

http://www.agf.gov.bc.ca/pesticides/...oxystrobin.pdf

April 29, 2009	#1
amideutch Tomatovillian™ Join Date: Feb 2006 Location: Germany 49°26"N 07°36"E Posts: 5,041	EXEL Systemic Fungicide Came across this product on the web. It's a systemic and contact fungicide and the primary ingredient is Mono- and di- potassium salts of phosphorous acid. It's EPA registered and NOT on the PAN Bad Actor Product list. Here are some links concerning the product. Ami http://www.pesticideinfo.org/Detail_...DIST_NR=070179 https://www.vermontbean.com/dp.asp?c...8409681164B%7D http://www.organiclabs.com/organic_l...el_product.htm __________________ Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘...Holy Crap .....What a ride!'

May 27, 2009	#3
amideutch Tomatovillian™ Join Date: Feb 2006 Location: Germany 49°26"N 07°36"E Posts: 5,041	Suze, I came across this product on the net last year but didn't pursue it as it was not available at the retail level. But now it is. Need somebody in the US that has reoccurring fungal problems to give it a try. __________________ Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘...Holy Crap .....What a ride!'

May 29, 2009	#5
amideutch Tomatovillian™ Join Date: Feb 2006 Location: Germany 49°26"N 07°36"E Posts: 5,041	jc, if you go to the first link I gave, pesticide info.org it will bring up the listing for EXEL LG or the EPA designation which is "Agri-fos. If you look down the page to "Registered Uses" you will see tomatoes listed for foliar and soil treatment along with several other listings for vegetables, fruit trees etc. I also asked the question to the folks at Organic Laboratories that make the product. Will pass back when I get a reply. Ami __________________ Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘...Holy Crap .....What a ride!'

May 30, 2009	#6
amideutch Tomatovillian™ Join Date: Feb 2006 Location: Germany 49°26"N 07°36"E Posts: 5,041	Here's a link on EXEL (Agri-fos) regarding use on vegetables. Ami http://www.lsuagcenter.com/NR/rdonly...densLOWRES.pdf http://www.ent.uga.edu/labels/fun/agri-fos.pdf __________________ Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘...Holy Crap .....What a ride!'

May 30, 2009	#7
amideutch Tomatovillian™ Join Date: Feb 2006 Location: Germany 49°26"N 07°36"E Posts: 5,041	More info. Ami Phosphorous Acid Fungicides Explained by John Hartman and Kenny Seebold, Extension Plant Pathologists Kentucky fruit and vegetable growers may have noticed that phosphorous acid has been listed for management of several fruit diseases in recent editions of the commercial tree fruit and small fruit spray guides and management of several vegetable diseases on recent product labels. Some County Extension Agents and growers have been curious to know how they work. Parts of the following material was adapted from an insightful article written by Annemiek Schilder, Michigan State University Plant Pathologist, and was published in the Michigan State University Fruit Crop Advisory Team Alert, Vol. 20, No. 5, May 10, 2005. Phosphorous acid fungicides Recently, a number of new fungicides that have phosphorous acid as the active ingredient have come on the market. Other names sometimes used for this group are phosphonates or phosphites. Commercial products in this group may include ProPhyt®, Phostrol® and Agri-Fos®. Aliette® (fosetyl-Al), an older fungicide, is the prototype for this group of fungicides. However, the long-standing patent on Aliette® had prevented similar fungicides from being developed until recently. In Australia, where the patent did not apply, growers have been using the phosphorous acid fungicides for over a decade. Phosphorous acid is not fertilizer. The term “phosphorous acid” should not be confused with phosphoric acid or phosphorus (P), a fertilizer component. In fertilizers, P is normally found in the form of phosphoric acid (H3PO4), which readily disassociates to release hydrogen phosphate (HPO4-2) and dihydrogen phosphate (H2PO4 - ). Both of these ions may be taken up by the plant and are mobile once inside the plant. Phosphorous acid is H3PO3. A single letter difference in the name of a chemical compound can make a major difference in its properties. Phosphorous acid releases the phosphonate ion (HPO3 2; also called phosphite) upon disassociation. Phosphonate is easily taken up and translocated inside the plant. Phosphorous acid does not get converted into phosphate, which is the primary source of P for plants. Because phosphorous acid and its derivatives do not get metabolized in plants, they are fairly stable and probably contribute little or nothing to P nutritional needs of the plants. Some researchers have investigated the ability of phosphorous acid to act as a nutrient source for plant growth and found that P deficiency symptoms developed with phosphorous acid as the sole source of P. This means that although phosphorous acid can control diseases, it is not a substitute for P fertilization. The inverse is also true: phosphate is an excellent source of P for plant growth, but is unable to control diseases other than improving the general health of the crop. So applying high amounts of P fertilizer will not work as a disease control measure. Diseases managed with phosphorous acid. Researchers have found that phosphorous acid fungicides are especially effective against Oomycete pathogens, such as Phytophthora, Pythium, and downy mildews in a number of crops. Our fruit spray guides list Phytophthora collar rot and root rot of tree fruits, blueberries, and brambles; strawberry red stele and leather rot; and grape downy mildew as targets for phosphorous acid fungicides. Phosphorous acid is labeled for use on brassicas (broccoli, cabbage, cauliflower); cucurbits; edible legumes; Solanaceous crops (eggplant, pepper, potato, tomato, and tobacco); onions; and a number of leafy vegetables for management of diseases caused by Phytophthora, Pythium, Rhizoctonia, and Fusarium spp. Downy mildews of these crops are also listed on product labels. Materials containing phosphorous acid, in general, have performed best against Phytophthora blight and downy mildews. Preventive applications were more effective in reducing season-long severity of disease than those applied after disease onset. Phosphorous acid has a direct and possibly an indirect effect on these pathogens. It inhibits a particular metabolic process (oxidative phosphorylation). In addition, some evidence suggests that phosphorous acid has an indirect effect by stimulating the plants natural defense response against pathogen attack. This probably explains the much broader spectrum of activity observed in many fungicide efficacy trials. In fruit crops, it has been found, for instance, that ProPhyt had efficacy against downy mildew, Phomopsis cane and leaf spot, and black rot (but not much against powdery mildew) in grapes. There is also evidence of activity of these compounds against anthracnose in blueberries. The phosphonate ion is highly systemic and fairly stable in plants. The systemic activity allows them to be applied as foliar fungicides for prevention of Phytophthora and Pythium root rots. They may also display some curative activity. In general, applications every 14 days seem to be effective in grapes, but follow label directions. These fungicides are sold as solutions of potassium and/or sodium salts of phosphorous acid. To compare them, one should look at the phosphorous acid equivalent, which should be listed on the label. Fungicide precautions. Phosphorous acid fungicide prices range from about $25 to $35 per gallon, and the application rate ranges from 2 to 5 pt/ acre ($6.25 to $22 per acre, depending on the product and rate). Under high disease pressure, higher rates may need to be used and spray intervals tightened. These fungicides are formulated in salt form, so care must be taken not to exceed a certain concentration, as crop injury may result. In addition, if the concentration is too high, the pH may become so low that in tank mixes with copper products (particularly copper hydroxide such as Kocide), too much copper will become available and result in crop injury. Pawpaw Tasting Highlights Kentucky State/Pawpaw Foundation Workshop by Kirk W. Pomper, K.S.U., USDA Pawpaw Germplasm Repository, Frankfort, KY The Kentucky __________________ Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘...Holy Crap .....What a ride!'

May 27, 2009	#2
Suze Tomatovillian™ Join Date: Jan 2006 Location: Texas Posts: 3,027	Belated response - but Ted, thanks for posting about this. I saw it earlier, but didn't get around to commenting, 'tho I meant to. If you hear anything else about this product and have more info to share (whether anecdotal from growers or studies), please update and add to the thread. I would most definitely be interested in further information. From what I can gather, this is touted to be an organic, yet systemic fungicide approved for tomato crops, is that correct? Sounds like it from your comments above, and also the links ...

May 29, 2009	#4
jcmorse33 Tomatovillian™ Join Date: Jun 2007 Location: Central Virginia Posts: 242	This looks interesting, since I get lots of foliage diseases in my neck of the woods. But I am curious why the manufacturer doesn't list it as being for use on vegetable crops. They do list turf grass, fruit trees, and ornamentals... any ideas?

June 11, 2009	#8
chalstonsc Tomatovillian™ Join Date: Jan 2007 Location: sc Posts: 339	Ami-and others... Thanks for the info. Ami, from what I'm reading, the Agri-Fos is listed for late blight and root rot. My issues seem to be a variety of fungal leaf ones beyond late blight. Am I missing something or do you know if it would work for a broader variety of fungal leaf problems?

June 12, 2009	#12
amideutch Tomatovillian™ Join Date: Feb 2006 Location: Germany 49°26"N 07°36"E Posts: 5,041	charlston, If you go to my first post and the first link, pesticideinfo.org and go to the Registered Uses in the U.S. for Agri-fos and go to Pests I think it about covers most of what you listed. Actinovate is another excellent fungicide that works above ground as well as below ground. Here's a link on flea beetles. Ami http://www.planetnatural.com/site/xd...e-control.html __________________ Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘...Holy Crap .....What a ride!'

April 1, 2010	#14
Suze Tomatovillian™ Join Date: Jan 2006 Location: Texas Posts: 3,027	I ordered some Exel LG a couple of days ago to try out. On its way. Any updates, comments, or general tips for use other than just following the label instructions? For those of you who used it last year (Ami, Ray, ?), how well did it seem to work at preventing or controlling foliar fungal disease?