5 Stored Grain insect Pest Management — E-66-W A PICTORIAL KEY TO BEETLE PESTS OF STORED GRAIN COMMONLY FOUND IN INDIANA
Prothorax with 6 Prothorax without mul- teeth on each side tiple teeth on each side
Prothorax Without distinct snout Distinct snout
Hardened wings (elytra) with Hardened wings (elytra) Antenna distinctly longer than 4 pale spots. Punctures on Antenna shorter than length entirely dark. Punctures of head and prothorax length of head and prothorax prothorax rounded. Devel- on prothorax elongate. together together oped wings under elytra. Sawtoothed Grain Beetle Oryzaephilus surinamensis
Prothorax hood-shaped & Prothorax not head concealed from above hood-shaped Rice Weevil Granary Weevil Sitophilus oryzae Sitophilus granarius Body subcylindrical Body flattened
Lesser Grain Borer Spider Beetles Rhyzopertha dominica Many species Flat Grain Beetle Rusty Grain Beetle Cryptolestes sp. Body at least 1/4" long Body less than 1/4" long
3/8" long, thorax strongly Eyes more or less Side margins of head projecting Approx. 1" long constricted at base rounded, not divided into and partially dividing eyes
Antennal club gradually Antennal club with last three enlarged toward tip segments abruptly enlarged
Cadelle Meal Worm Tenebroides mauritanicus Tenebrio spp. Confused Flour Beetle Red Flour Beetle Conspicuous tooth on each Without tooth on protho- Tribolium confusum Tribolium castaneum front corner of the prothorax rax, body is hairy
Prothorax
Adapted from A KEY TO SOME BEETLES COMMONLY FOUND IN STORED FOODS, By Harry D. Foreign Grain Beetle Hairy Fungus Beetle Pratt and Harold G. Scott Ahasverus advena Typhaea stercorea