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Rapid growth provides crop protection challenge

On the latest visit to Bayer’s trial site in Callow, Hereford, crops had progressed rapidly through their growth stages in response to the recent spell of warm weather, with leaf 3 fully emerged on several wheat varieties.


Abby   Kellett

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Abby   Kellett
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Rapid growth provides crop protection challenge #clubhectare #arable

Where crops have been sown early and on particularly fertile soils, early maturing varieties have reached growth stage 31 quicker than usual, which could cause problems in providing adequate protection from ‘standard’ fungicide timings, according to Bayer technical manager, Gareth Bubb.

 

He says: “If the GS31 is early, you can end up with a big gap between your T1 and your T2. Depending on how early the T1 is, the interval could be more than four weeks.”

 

See also: Delayed drilling dampens disease

 

Since most T1 fungicides only provide around three to four weeks’ worth of protection, Mr Bubb says growers should be considering a T1.5 where the interval is likely to exceed the activity of the T1 fungicide, but insists growers need not spend a lot of money on the additional fungicide application.


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“I would think about it in the same way as the T0 spray. What you are trying to achieve is some protection of leaf 2, so I would include some chlorothalonil to provide that protection.

 

“Then I would look at the variety and if it’s a ‘rusty’ variety, then you’ve got two choices; you either add a rust-active strobilurin or you include a rust-active azole, but I would avoid things like epoxiconazole and prothioconazole because that would mean adding another selection pressure.”

Gareth Bubb

At Bayer’s trial site in Callow, Hereford, disease pressure is higher than last year, with septoria at particularly high levels on most varieties. Therefore, protecting emerging leaves will be particularly important.

 

“There is a lot of inoculum about, septoria seems to be on everything, eyespot can be found on selected varieties such as Graham,” says Mr Bubb.

mildew

mildew

As well as putting pressure on fungicide timings, rapid crop growth has created ideal conditions for mildew, which can be seen on many crops. “A couple of weeks ago, mildew could only be found in selected varieties, but actually we can find it in nearly all of them now.

 

“If growers didn’t put a mildewicide in with their T0 and they are finding they are now seeing high levels of mildew, they want to put something in with the T1 spray to eradicate it, because while prothioconazole is a good protectant, it won’t eradicate the disease.”

 

Opting to incorporate a mildewicide into the tank mix can ramp up the fungicide cost and the disease tends to have a more modest impact on crop yield and so, where mildew is present at low levels, Mr Bubb says the inclusion of a generic fungicide with mildew activity should suffice.

 

“If mildew is at high levels, it’s important to control it early. However, where infections are not so severe, something like Aviator (bixafen + prothioconazole) or Ascra (bixafen+fluopyram+ prothioconazole) at T2 should keep the crop clean.

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