South: T1 sprays delayed on backward wheats

Wheat crops are very variable ranging from flag leaf just emerging to first node, which due to last week’s windy conditions, has led to delayed T1 applications on backward stands.

T0 fungicides have been adequate, with no yellow rust pustules being found prior to last weeks T1 fungicides. Septoria tritici remains only on the lower leaves but pressure is increasing since having had heavy rainfall. It has not been brown rust weather as it has been too cold.

Growth regulation has been difficult whilst the crops were under stress in the very dry conditions, but assessment now is recommended to see if a later growth regulator is needed on the strongest crops – these will need to be applied before GS37.

Forward winter barley fields are at awns emerging and Net blotch and rhynchosporium can be found at low levels but time has run out for growth regulation when crops are at GS37. Grass weed control remains difficult with a big reliance on residuals in the autumn and little chemistry for post emergence contact grass weed control in the spring .

Where these difficult problems persist careful rotational planning is important.

Non pigeon damaged oilseed rape crops are reaching full flower and are being sprayed with fungicide for sclerotinia control.

Backward, damaged crops are creeping into flower but sclerotinia pressure will be lower in cooler conditions. Bladder pod midge can be found but no seed weevil has been spotted yet.

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