Farmers Guradian
Topics
Nine ways to keep your farm vehicles safe

Nine ways to keep your farm vehicles safe

Arable Farming Magazine

Arable Farming Magazine

Dairy Farmer Magazine

Dairy Farmer Magazine

British Farming Awards

CropTec

LAMMA 2019

New to Farmers Guardian?
Register Now
Login or Register
New to Farmers Guardian?
Register Now
New to Farmers Guardian?
Register Now

You are viewing your 1 free article

Register now to receive 2 free articles every 7 days or subscribe for unlimited access.

Subscribe | Register

Variable crops threaten to compromise T2 fungicide timings

As wheat crops begin to reach the T2 fungicide timing, variable crops caused by the stop-start season are proving a challenge, according to agronomists.


Abby   Kellett

Twitter Facebook
Abby   Kellett
Twitter Facebook

Crop Management Partners agronomist Richard Cromie says he is advising on crops that vary greatly, even in the same field. “In just two days we had a 23 deg C temperature variation and some parts of the South East of England received 41mm of rain. I have got fields where plant height in the best parts of the field is twice that of plants in clay caps or headlands.”

 

As a result he urges growers to base decisions on the better part of the fields. “Precision technology has enabled us to make variable applications such as fertiliser but that isn’t realistic with everything. This season it is compounded as the gap from T1 could be a matter of two weeks, and many growers are already playing catch up. Plants that have raced on could probably do with a further PGR to limit height. But more backward parts of the field will be arrested further. It is probably the price many will have to pay.”

Despite being robust enough to deal with Septoria, brown rust, mildew and eyespot, many T1s were delayed by the weather. “You can already see the difference in those fields where T1s were applied as leaf three emerged and those that were delayed. Septoria has spread from the base and the flag leaf tip is now showing. SDHIs are the only real curative option and rates might need to be lifted in some cases.”

 

Further north, AICC agronomist Patrick Stephenson says crop performance is variable. “We have some really good looking crops but also some much less so. These poor crops are worth investing but yield responses will be reduced.”

 

Where crop potential has been diminished he will still be advising a three way mix of azole, SDHI and multisite but says that growers might have some room for dose flexibility. “With T1s going on in the first week of May the gap for a fast developing variety like Gallant to the T2 could be as short as two weeks. Although Septoria is in the lower canopy, T1 sprays should keep it in check ensuring a protective position by GS39. A potent Septoria active product will be required, but for a product like Ascra (prothioconazole + bixafen + fluopyram) then you shouldn’t need to move above the 1.2 l/ha rate.”

 

High septoria pressure in the South West of England means growers with susceptible varieties or early drilled crops need to be particularly vigilant, according to Bayer’s Tim Nicholson. He says: “Septoria develops faster in higher temperatures and typically we see symptoms around 220 day degrees from infection. Where T1 sprays were delayed symptoms may not have expressed themselves yet.”

 

His fear is a ‘double whammy’ of spray interruptions. “What happens now depends on the weather. If this dry weather continues, and with the gap to T2 likely to be short, then most azole-SDHI combinations will contain the disease. If it doesn’t, then there is cause for concern.”

Your tweets

 

 

Twitter Facebook
Post a Comment
To see comments and join in the conversation please log in.
Facebook
Twitter
RSS
Facebook
Twitter
RSS