Pest of the week – Frit Fly

Frit fly (Oscinella frit) cause damage to cereal crops, and are most likely to have an effect on crops following grassland or fallow. There are normally several generations per year, with the most damaging generation being in September-October, in newly drilled crops.

Symptoms are visible as dead/yellowing tillers, that normally have a small yellow/white larva present at the base of the tiller.

Chemical control is very limited, so cultural control such as leaving a gap of 10 weeks between the previous grass crop or grass stubble will reduce the risk significantly.

Frit fly life cycle

Frit fly life cycle

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