Larger Grain Borer

Category: LW
Minimum Life Cycle: 25 days.
Distribution: Central America, parts of Africa. Thirty-four percent loss in maize after three to six months storage.
Eggs - Laid in stored maize on the cob or bulk maize.
Larvae - Feed on grain.
Adults - Feed on grain.

Larger Grain Borer (Prostephanus truncatus). The larger grain borer usually is restricted to corn (maize) and does not commonly occur north of Mexico. In recent years, new infestations have occurred in Africa. The insect is larger and darker in color than the lesser grain borer. It is extremely damaging to maize when dried and stored on the cob (Figure 5).

(Slide and top caption courtesy of GASGA Publication.)

[Larger Grain Borer, 3 Views]
Figure 5. Larger grain borer.
a. Lesser grain borer.
b. Larger grain borer.
c. Larger grain borer (characteristic truncated posterier).

Index for the Interpretive Line Slides for Insects
Chapter 13, Stored Product Management
E-912, Stored Product Management Main Home Page

P*E*A*R*L (OCES Online Publications)
Oklahoma Cooperative Extension Service
Division of Agricultural Sciences and Natural Resources
Oklahoma State University