Crataegus monogyna, Dronten, two galled flowers in the inflorescence © Arnold Grosscurt

Crataegus monogyna, Zwolle, 8.v.2018 © Arnold Grosscurt: opened gall with larva

larva

gall

Larvae and pupae in the flower buds. The buds remain closed, turn brown, often drop off.

host plants

Rosaceae, monophagous

Crataegus laevigata, monogyna.

That the species would live also on Pyrus, as Buhr writes, is not confirmed by Dieckmann.

references

Buhr (1964a), Colonnelli, Osella & Cornacchia (2011a), Delbol (2013a), Dieckmann (1968a, 1988a), Knutelski (2001a), Lehmann & Hannover (2016a), Redfern & Shirley (2011a), Rheinheimer & Hassler (2010a), Roskam (2009a), Tomasi (2014a), Ugarte San Vicente (2005a).