Dryocosmus minusculus
(agamic)agamic:The agamic (AKA unisexual) generation of an oak gall wasp (cynipini) species consists of only female wasps, which do not mate before laying the eggs which become the male and females of the sexual generation (sexgen).
View in glossary →
Location: upper leaf, lower leaf, on leaf veins, between leaf veins
Form:
Cells:
Possible Range:
The gall's range is computed from the range of all hosts that the gall occurs on. In some cases we have evidence that the gall does not occur across the full range of the hosts and we will remove these places from the range. For undescribed species we will show the expected range based on hosts plus where the galls have been observed.
Our ID Notes may contain important tips necessary for distinguishing this gall
from similar galls and/or important information about the taxonomic status of
this gall inducer.
Gall (pl. 17, fig. 13) . — Small brown galls up to 2.7 mm. in diameter, shaped like a depressed sphere with a minute pit in the center above. Produced on upper side of leaves of Quercus agrifolia, Q. wislizeni, and rarely on Q. kelloggii in the fall and dropping when mature. Said to be so numerous sometimes as to defoliate the tree. Some years these galls are not common.
Habitat. — The types were reared from galls collected October 22, 1939, on Quercus agrifolia on Mount Diablo, Calif. Adults emerged April 17, 1941. Galls have been noted on this host at some 40 localities between Alpine and Ukiah and Red Bluff, Calif. They are also common on Quercus wislizeni and have been seen on Quercus kelloggii a few times. The guest fly, Synergus agrifoliae Ashmead, often reared from it, varies much in color pattern and has been redescribed as Synergus maculatus Fullaway (1911) new synonymy, and as Synergus obscurus McCracken and Egbert (1922), new synonymy.
