Help needed with fungicide spray timing

Hi All
I am researching the potential for using one of our novel organic bio-fungicides in conventional cereal crops.

The product in question is chitosan, which can be used in the UK/EU for fungal disease control. For more details see:

I was hoping that somebody on here could answer the following question for me:
When is the last timing for a fungicide spray in a conventional wheat crop (growth stage/date of year)? And (most crucially), is the timing of that last spray determined due to experience of the efficacy of the sprays and the resulting impact on yield & quality, or because the product is only authorised for use with a pre-harvest index (PHI) for that time before harvest?

This is of importance to my research as, if the last timing is based on PHI, it could be that chitosan could be used by farmers (conventional and organic) looking for disease control later in the crop's development. Especially if other fungicides are not available during this time.

Even if the timing of the last spray is not based on PHI, I still think the product has good opportunities in this market as the dose cost for cereal crops is as low as £7/ha. So the successes we are seeing on strawberry/potatoes should still show good ROI in cereals.

I appreciate any help you can give on this matter, and I am happy to clear up any aspect that might not be clear.

Regards

Russ
 

Brisel

Member
NFFN Member
Location
Midlands
Read this for a guide to which wheat leaves contribute the most to yield https://projectblue.blob.core.windo...ilseeds/General/Wheat growth guide (2021).pdf

If you only apply one disease control product, you would do so to the final top leaf (flag leaf) as soon as it is fully emerged at GS37-39. This leaf contributes the most to yield, followed by leaf 2 then 3 then the ear itself.

The last fungicide timing is around mid flowering GS65. Some products are not approved for use this late due to residue risk.
 
Hi
Following on from this initial post, I have put together the table below listing all the fungicides I could find for sale in the UK and the pre-harvest index for them. Have I missed any fungicides that you routinely use on your particular crops?
Regards
Russell


Screenshot 2022-05-11 at 19.34.27.png
 

Shutesy

Moderator
Arable Farmer
Hi
Following on from this initial post, I have put together the table below listing all the fungicides I could find for sale in the UK and the pre-harvest index for them. Have I missed any fungicides that you routinely use on your particular crops?
Regards
Russell


View attachment 1035396
I think your a couple short. According the HSE list there are 832 approved fungicides in the UK.

Use the above link to search for what you need to know.
 
Many thanks for everybody's help with this one!

If you are interested; I have collated most of the available info on pre-harvest indices and produced the tables below with a range of fungicides and their authorised PHI.

The first table is for cereals, and the second one is for 'other crops'.

Screenshot 2022-05-12 at 14.30.41.png


Screenshot 2022-05-12 at 14.29.42.png



thanks again
Russell
 
Are consumers happy with chitisan applied the day before harvest?
Good question. Yes, unlike conventional fungicides, chitosan is not directly biocidal. Instead it acts by activating plant defence mechanisms and producing a bioplastic barrier to spores. Chitosan has got a long history of use in brewing and in drug delivery. As such, it is safe to use just before harvest.

I just published a blog post on the subject of PHI and chitosan here: https://www.eutrema.co.uk/post/why-chitosan-is-the-most-flexible-fungicide
 

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The Health and Safety Executive for Northern Ireland (HSENI) alongside the Farm Safety Partnership (FSP), has named new farm safety champions and commended the outstanding work on farm safety that has been carried out in the farming community in the last 20 years.

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