HEAR Agronomy

News from the field - HEAR

January

The weather turned cold into January and successive days of hard frost provided suitable conditions for Kerb applications and slowed disease development. Some areas have seen some pigeons grazing but this is very varied. Thoughts will soon turn towards the first fertiliser dose for spring applications as we leave winter.

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Figure 1 HEAR variety Rocca in Nottinghamshire, 13th January

December

The mild November has helped smaller crops grow on and are now a good size heading into winter. Cold weather has arrived at last which has allowed the soils to be cool enough for Kerb applications for blackgrass control.

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Figure 1 HEAR variety Rocca in Nottinghamshire, 19th December

Some Phoma is visible now in crops as well as CSFB larvae in stems.

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Figure 2 Phoma

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Figure 3 AHDB Phoma forecast  https://ahdb.org.uk/phoma-leaf-spot-forecast

 

October/November

Crops are at varying growth stages, depending on drill date and moisture. The rain arrived in October and the mild conditions allowed backward crops time to recover. Thus far there seems to be low Phoma pressure in crops, but growers should keep an eye on forecasts. Given the mild conditions, pressure is bound to increase.

Grass weed control is the main focus of the month as weeds have been slow to emerge due to the initial dry conditions. Remember Centurion max stewardship has restrictions on timing in October and Kerb should not be applied until soil temps are 10 °C and falling. Soils remain warm in the mild weather and Kerb applied to warm soils will degrade quickly and give little to no control as well as increasing chances of it ending up in the water course.

 

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Figure 1 HEAR variety Rocca in Gloucestershire, 17th October

 

hear news from field october graph

 

 

Figure 2 AHDB Phoma forecast  https://ahdb.org.uk/phoma-leaf-spot-forecast

 

 

 

August / September

Planting has commenced for winter OSR. Like across the country HEAR crops are at different stages depending on drill date and moisture. Early August drilled crops are a good size, later ones are establishing. Conditions remain dry heading towards the end of September for some regions. With rain it is likely blackgrass will start to emerge and Centurion max is approved for use, alongside Kerb later. Please note Crawler is no longer available. Earlier sown crops will soon have a BLW spray or volunteer cereal spray.

Slug pressure has been higher than expected and care must be taken to ensure crops are not lost to these. CSFB numbers did not increase until September, it is generally accepted that resistance to pyrethroids are widespread that spraying in most instances will offer only minimal control.

GB map of Pyrethroid resistant csfb

Source: AHDB https://ahdb.org.uk/knowledge-library/cabbage-stem-flea-beetle-csfb-treatment-thresholds-in-oilseed-rape

AHDB CSFB Trap Numbers Sept 2022

Source: AHDB https://ahdb.org.uk/knowledge-library/cabbage-stem-flea-beetle-csfb-and-its-management-in-oilseed-rape

 

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