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    Arable & Agronomy

    Warnings to not ignore lemon blossom midge this season

    Matthew TiltBy Matthew TiltMay 23, 20233 Mins Read
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    Adult of yellow wheat blossom midge (Contarinia tritici) on wheat.

    Hutchinsons’ technical manager for the south, Neil Watson, is warning growers to pay more attention to lemon blossom midge, as much of the efforts are focused on its orange cousin.

    “Traditionally associated with cereal crops in the south of the country, in recent years lemon blossom midge has been reported as far north as Cambridgeshire and the Midlands,” he said.

    “Whereas orange blossom midge larvae feed on developing grain in multiple sites reducing yield and quality, multiple lemon blossom midge larvae feed on single grain sites, allowing unaffected grains on either side to compensate, thereby generally impacting less on yield and quality.

    “As it appears earlier than orange blossom midge, it is not picked up in monitoring because lemon blossom midge is not attracted to the same pheromone traps as those for orange blossom midge and detection is often reliant on actual observations, and by the time it is, the damage has already been done.”

    Neil Watson. Picture: Tim Scrivener

    Mr Watson added that lemon blossom midge is generally harder to spot, pointing out that we currently know more about the orange blossom midge. “The obvious way to distinguish between the two midges is colour. Also, lemon blossom midge appears earlier, as the flag sheath begins to extend, and are often missed. They also emerge over a shorter period.

    “It is also possible that warmer wetter summers are more conducive to the pest,” he explained. “A period of warm weather in May with soil temperatures above 13°C activates pupation, but flight occurs when air temperatures are above 15°C, so this is the crucial time to monitor for activity.

    “As growers select varieties with orange blossom midge resistance, it could be that lemon blossom midge is selected against as it were and has become more of an issue.

    “Whilst there is varietal resistance to orange blossom midge, over 60% of current AHDB listed wheat varieties are believed to have resistance to the pest, there is no known resistance to the lemon blossom midge.

    “Whilst breeders investigate potential resistance sources, even if resistance were introduced, varieties with such a genetic trait would be several years away from the market.

    “Control with pyrethroids is possible, although there is no product with a label recommendation. However, there is no reason to believe that there should be any differentiation between species in terms of control from products used for orange wheat blossom midge,” concluded Mr Watson.

    For more information go to www.hlhltd.co.uk

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    Matthew Tilt
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    Machinery editor for Farm Contractor & Large Scale Farmer. Matt has worked as an agricultural machinery journalist for five years, following time spent in his family’s Worcestershire contracting business. When he’s not driving or writing about the latest farm equipment, he can be found in his local cinema, or with his headphones in, reading a good book.

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