Septoria
- Thread starter FarmboyJ
- Start date
Totally agree with An Gof, got to be careful what I say, but all I can say is that in the absence of a half rate triazole partner (and by that I mean one one of the historically most effective) it was no better than an untreated crop on some of our best wheat this year. I have never seen such a spectacular failure of a plant protection product. Not going to name any names and I am not interested in getting sued, but I believe it is ok to discuss on farm responses to a fungicide program, no different to interpreting trial results. One block of wheat we had that was looked after by a certain chemical supply company was catastrophic. Diego drilled end of Oct after beans yielded 2.75 t/acre, looked like a 4.5t/acre crop all year, riddled in Septoria 3 weeks post T2, 1.4l/ha of Imtrex at said timing. Would add that wheat grown in our part of the world is under immense Septoria pressure and equally such a disaster could have been down to any other fungicide used at T0, T1 and T3, however other programs yielded better. Won't be wasting my money on it next year nor listening to any commercially biased agronomy from guess who! Funny is it not that most professionals such as medics or veterinarians have a duty of care to their patients above all else.... Won't be cancelling my Niab/TAG membership anytime soon.
Did you get to the Kingsbridge trials @Properjob ?
I have never seen disease pressure like it. All spring there were posts on TFF about low disease pressure and reducing fungicide use. Well this year i used a T1.5 as routine and still had poor yields with a very robust programme. But when you look at the response between treated and untreated there is absolutely no sense in cutting rates in our climate.
Agree ref NIABTAG, best money you can spend in a year for unbiased advice, there is no other equivalent source.
david
Member
- Location
- County Down
@Properjob
What products/actives and rates of, when on at T0 and T1 ?
Was there any massive gaps between applications timings ?
What products/actives and rates of, when on at T0 and T1 ?
Was there any massive gaps between applications timings ?
Knowing @Properjob as i do i very much doubt that there were any "massive gaps" between application timings.
No. Not in a closed question like that. Septoria needs a protective programme from leaf 4 until mid flowering that uses different modes of action chemistry to manage well known resistance to the pathogen. It all depends on where you are, what variety you are growing etc. @Properjob and @An Gof are in the South West of England where septoria tritici pressure is very high and spending £100/ha on a susceptible variety will barely do the job in a wet year.
Septoria tritici is a disease that is very hard to cure once the crop is infected. High doses of the best SDHI chemistry will not cure it a week after infection so the best you can hope to achieve is to get long lasting protectants on the leaves. The recognised way of doing this is to use a mix of multisite protectants like chlorothalonil with higher rate triazoles and at least 2/3 doses of SDHIs at the more important timings to look after the newly emerged top 3 leaves of the wheat plant.
Septoria is getting a bit like blight and I think we will be spraying accordingly in the future. £100/ha would be cheap for us with regards to a fungicide program. The block of wheat I was referring to had an embarassing spend of £155/ha and looked untreated, not my recommendations I might add, all spray timing spot on as it has to be in our part of the world. We don't just grow Diego and other blocks of the same variety were better under a different program. Would like to add that we would normally average 4t/acre and although June was a high pressure month, April and May were dryer than average this year. What I think is that certain agronomy supply companies have become far too commercially orientated, as they often have been, and are putting their own interests and chemical purchasing targets above on farm advice and resistance management strategies. I am sure this all backed up by their own trial work but I am anticipating some independent fungicide trial data may show quite a different picture this year. Something quite a few of us in Cornwall have seen on farm this year. I may be wrong but time will tell......
Interesting analogy ref blight. I'm of the firm opinion now that each emerged leaf requires protection.
Our issue here is an almost total dependence on CTL with 4 applications now becoming a standard programme.
Last season all spray timings were spot on and we still got stuffed in this part of the world. Like @Properjob crops that looked like 10t/ha + bankers just failed to deliver when shown the Combine knife.
Thing is without going into specifics, some wheat locally was very good, just not where certain products were used. Lets just say faddy ideas about triazole stacking and use of older triazoles and certain SDHI products have been found desperately wanting this year.
When you look at a crop and I mean one block specifically that looks like an untreated trial plot in the middle of June. It is fair to say you can rule out harvest losses.
Fair enough for that block. Being dead from disease long before harvest would explain that one!
If you're not going to condemn any products, what would you say was missing from the worst affected stuff?
A high/robust rate of one of the most traditionally effective triazoles, namely epoxi!
- Location
- Shropshire
It goes without saying that the basis of any program should be CTL AND epoxiconazole/prothioconazole at all timings. All other products should be added in on top.
Imtrex etc are excellent products, but the program is not SDHI plus triazole or CTL, it's CTL and triazole plus SDHI.
I also believe that with epoxiconazole at its current prices, a Cherokee type product should be ruled out at T0
Biggest difficulty hereabouts seems to be that almost everyone (see above) is still blaming septoria tritici for this year's misfortunes when the problem was mostly due to septoria nodorum.
Although closely related and often confused, there are important differences in these two diseases' best solutions.
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david
Member
- Location
- County Down
So what are folks going to use in 2018 with the expected shortage of CTL ?