90 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
bloom June 13 began to emerge as adults on July 23, continuing to 
July 31; thus requiring from forty-one to forty-nine days from hatching 
of larvae to emergence of the moths. Likewise, larvae that entered 
green and milky wheat required from forty to fifty-four days to com¬ 
plete their development. 
Inasmuch as the Angoumois grain moth has been considered an 
economic pest of stored grain, it seems worthy of note that the fore¬ 
going observations on oviposition and development of larvae within 
unripe grain were also verified by coinciding field observations. Eggs 
and young larvae were found in the growing grain during early June, 
and adults began to emerge in late July from the harvested grain, 
JUNE 
JULY 
LARVAE 1 
MOTHS 2 
LARVAE 2 
MOTHS 3 
HIBERNATING 
LARVAE 
LARVAE 
HIBERNATING 
Fig. 4. Diagram of broods of Angoumois grain moth. Moths 1, first brood from 
overwintering larvae in barns and granaries; Larvae 1, larvae in developing grain; 
Moths 2, second brood at harvest time; Larvae 2, second brood larvae occurring in 
field or stored grain; Moths 3, third brood in stored grain, and in part in waste 
grain in field; Hibernating larvae 3, part transforms to fourth brood—remainder 
hibernate; Moths 4, fourth brood; Hibernating larvae 4,—part forms fifth brood— 
remainder hibernate; Moths 5, fifth brood; Hibernating larvae 5, fifth brood larvae 
all hibernate. 
coincident with moths reared in the experiment plots. This initial 
field infestation is sparse and scattered, thus accounting for the very 
general distribution of later broods. 
Number of Generations. —The moths appearing at harvest time 
constitute the second generation, which occurs approximately between 
July 20 and August 14, with its maximum numbers during August 1 
to 6. In case of late gathering-in of the harvest a small part of this 
brood emerge as moths in the fields, which in turn gives rise to a third 
brood during September 1 to September 20. This third brood is the 
final brood occurring in the field. On the other hand, the moths of the 
second generation, which emerge in the warm tight barns, carry on 
their depredations through as many as six, and possibly seven, genera- 
