Quercus-agrifolia

Guides

• Callirhytis serricornis

  kernel flower gall wasp

  Callirhytis serricornis is a cynipid gall wasp endemic to California that induces distinct bottle- or vase-shaped galls on oak trees. The species exhibits alternating generations with different gall phenotypes: first-generation galls are brown, while second-generation galls are red and green. It is restricted to two host oak species in the western United States.

  gall-waspCynipidaeCalifornia-endemicoak-gallheterogonyQuercus-agrifoliaQuercus-wislizeni

• Phryganidia californica

  California Oak Moth, California Oakworm

  Phryganidia californica, commonly known as the California oak moth or California oakworm, is a moth in the family Notodontidae. It is the only member of its subfamily Dioptinae found north of Mexico. The species is notable for periodic population outbreaks that can cause extensive defoliation of oak trees along the California coast. Adults are active from March to November, with two generations per year in northern California and occasionally three in southern California.

  defoliatoroak-pestdiurnal-mothpopulation-outbreakCalifornia-endemicNotodontidaeDioptinaeQuercus-agrifoliabiological-control-research