Phosphites

[Hamishws]

As far as I am aware, there is no known mechanism within plants to convert phosphite to phosphate.

If this is the case, what is the role of the many phosphite (nutriphite, phorce, etc, etc) based products out there? Do they actually improve rooting and have fungicidal activity, as I have heard claims. Or are they just another well marketed snake oil?

Do many people on here use them, if so what do you feel there role is?

 

[shakerator]

They are registered fungicides in many countries. Google alliete by Bayer
They interfere with Pythium sp. I have seen dramatic effects on downy mildew in beans.

Some evidence to suggest improvement in plant vigour as a result of activity on root pathogens such as nematodes. Good when growing wheat 2 yrs out of 3

Phosphite is not an available nutrient. They are marketed as nutritional plant tonics so they save the cost of pesticide approval. Just one of many regulatory loopholes within the industry, of which I'm becoming increasingly cynical

 

[RBM]

Agree with the above, since we started using phosphites in beans (Phorce) we have not had a problem with Downey mildew and normally we are a bit of a hot bed for it.

 

[einstein]

They are registered fungicides in many countries. Google alliete by Bayer
They interfere with Pythium sp. I have seen dramatic effects on downy mildew in beans.

Some evidence to suggest improvement in plant vigour as a result of activity on root pathogens such as nematodes. Good when growing wheat 2 yrs out of 3

Phosphite is not an available nutrient. They are marketed as nutritional plant tonics so they save the cost of pesticide approval. Just one of many regulatory loopholes within the industry, of which I'm becoming increasingly cynical

i used alliette on strawbs in the past.Its ai is fosetyl-aluminium .Is that related to phosphite in any way??
I use hortiphyte on my strawbs every time i go through them .could easily be 10 times during the growing season.
Mutliple applications may not be economic or possible on lower value cereal crops.
i have been led to believe that they have an effect on crown rot on strawbs when used at a higher rate early on in the season

 

[franklin]

www.islandbiogreens.com/storage/POTASSIUM_PHOSPHITE1.doc

Quite interesting on the subject of how they work and as fungicides.

 

[franklin]

Agree with the above, since we started using phosphites in beans (Phorce) we have not had a problem with Downey mildew and normally we are a bit of a hot bed for it.

Just for interest, what rate of Phorce would you use for this, and would you use it as a protectant, or curative, or either?

 

[shakerator]

i used alliette on strawbs in the past.Its ai is fosetyl-aluminium .Is that related to phosphite in any way??
I use hortiphyte on my strawbs every time i go through them .could easily be 10 times during the growing season.
Mutliple applications may not be economic or possible on lower value cereal crops.
i have been led to believe that they have an effect on crown rot on strawbs when used at a higher rate early on in the season

yes = aluminium tris(ethyl phosphonate) . Im guessing it was phytophthora crown rot? same family as downy mildew. and potato blight but i dont think it can replace spraying shirlan every week

 

[shakerator]

Just for interest, what rate of Phorce would you use for this, and would you use it as a protectant, or curative, or either?

both

to be honest- they dont know how it works- modes of action are pure speculation. it dries out new lesions a treat- but if really bad id stick with metalyxl

 

[franklin]

I have just read an American article where phosphites are used for evaluation in disease control alongside Alliete and the rates of phosphite used were quite high. I am *sure* that, give the gallons of Nutriphyte we went though last year, that I can find a producer who can do it in a 500lt IBC without the fancy labels and that sort of thing. Seems that phosphite action in the plant is quite well known, but is the 2lt of product at the hellish high price going to do anything? If I could get the bulk up and price down then it would go in every post-em bean spray and be cost effective so long as I avoided Folio Gold on 80% of of our beans! If I can find some cheap, I am going to bung some in at T0 and see how it does on the wheat and barley.

 

[Jack Russell]

Static,
Omex do a simple but supposedly effective phosphate product in ibcs apparently

 

[einstein]

I have just read an American article where phosphites are used for evaluation in disease control alongside Alliete and the rates of phosphite used were quite high. I am *sure* that, give the gallons of Nutriphyte we went though last year, that I can find a producer who can do it in a 500lt IBC without the fancy labels and that sort of thing. Seems that phosphite action in the plant is quite well known, but is the 2lt of product at the hellish high price going to do anything? If I could get the bulk up and price down then it would go in every post-em bean spray and be cost effective so long as I avoided Folio Gold on 80% of of our beans! If I can find some cheap, I am going to bung some in at T0 and see how it does on the wheat and barley.

try hortifeeds at kettlethorpe.thats where i get my hortiphyte from.

 

[franklin]

I think I have found 4 places I can get a tank from. Going to ring them Monday and see what the price and analysis is.

 

[shakerator]

Taminco s phosphite is the best I've used efficacy wise
Called resistim

 

[Steevo]

Be interesting to hear more! Nutriphite at £13 or so a litre I think we paid once is a fair chunk more than the 50p/l or so for manganese in a barrel. At lower prices I'd be more likely to reconsider it again.

 

[RBM]

Just for interest, what rate of Phorce would you use for this, and would you use it as a protectant, or curative, or either?

0.5l/ha off the top of my head. Phorce is more effective than straight Nutriphite because of it's higher loading. But use predominantly as a protective. Not all phosphites are the same though!

 

[Steevo]

0.5l/ha off the top of my head. Phorce is more effective than straight Nutriphite because of it's higher loading. But use predominantly as a protective. Not all phosphites are the same though!

It's also a Hutchinsons only product as far as I am aware. Just saying....

 

[franklin]

Not all phosphites are the same though!

Seems that most of them are potassium phosphite at various %, plus in some cases some other trace elements.

 

[Gong Farmer]

As above, phosphites are not a source of phosphorus for the plant. They may have fungicidal activity on some pathogens, but not the sort of diseases we see on cereals for example