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1.Antenna- segmented 6.Thorax MERCHANT GRAIN BEETLE 1.Antenna- segmented 6.Thorax MERCHANT GRAIN BEETLE
2.Eyes- compound 7.Petiole- none 2.Eyes- compound 7.Petiole- none
3.Head 8.Abdomen- elongated 5 3.Head 8.Abdomen- elongated 5
4.Legs- 6 9.Color- dark brown 4.Legs- 6 9.Color- dark brown
5.Wings- under elytra 10.Other 5.Wings- under elytra 10.Other

Life Cycle Life Cycle
The female lays hundreds of eggs over several months, which hatch in The female lays hundreds of eggs over several months, which hatch in
about two weeks. Larvae go through several molts, forming a cocoon. about two weeks. Larvae go through several molts, forming a cocoon.
The Merchant Grain beetle will go through its life cycle in as few as 30- 4 8 The Merchant Grain beetle will go through its life cycle in as few as 30- 4 8
40 days. 40 days.
Photo Courtesy of UNIVAR Photo Courtesy of UNIVAR
MERCHANT GRAIN BEETLE Actual size 1/8” MERCHANT GRAIN BEETLE Actual size 1/8”

The Merchant Grain Beetle is similar in appearance to the Sawtooth Grain Beetle, with the most The Merchant Grain Beetle is similar in appearance to the Sawtooth Grain Beetle, with the most
noticeable difference that it has a swelling on the head behind the eye. Both have elongated noticeable difference that it has a swelling on the head behind the eye. Both have elongated
bodies. It is about 1/8th inch in size, and brown colored. It infests just about any type of dried bodies. It is about 1/8th inch in size, and brown colored. It infests just about any type of dried
food product, especially cereals, but also grains, nuts, coconut, and candy bars. food product, especially cereals, but also grains, nuts, coconut, and candy bars.

SAWTOOTH GRAIN BEETLE MERCHANT GRAIN BEETLE SAWTOOTH & MERCHANT PUPA SAWTOOTH GRAIN BEETLE MERCHANT GRAIN BEETLE SAWTOOTH & MERCHANT PUPA

Photo Courtesy of UNIVAR Photo Courtesy of UNIVAR

SAWTOOTH & MERCHANT LARVA SAWTOOTH & MERCHANT LARVA

Photo Courtesy of UNIVAR Photo Courtesy of UNIVAR Photo Courtesy of UNIVAR Photo Courtesy of UNIVAR
1.Antenna- 3 segmented club 6.Thorax- saw-like teeth SAWTOOTH GRAIN BEETLE 1.Antenna- 3 segmented club 6.Thorax- saw-like teeth SAWTOOTH GRAIN BEETLE
2.Eyes- compound 7.Petiole- none 2.Eyes- compound 7.Petiole- none
3.Head 8.Abdomen- long & slender 5 3.Head 8.Abdomen- long & slender 5
4.Legs- 6 9.Color- dark brown 6 4.Legs- 6 9.Color- dark brown 6
5.Wings- under elytra 10.Other- body pitted 5.Wings- under elytra 10.Other- body pitted

Life Cycle Life Cycle
The female can lay as many as 285 eggs during a 5-month period. De- The female can lay as many as 285 eggs during a 5-month period. De-
pending upon temperature, they hatch in 3-17 days. The larvae will go pending upon temperature, they hatch in 3-17 days. The larvae will go
through about three molts, creating a pupal cell or cocoon. Adults can 4 8 through about three molts, creating a pupal cell or cocoon. Adults can 4 8
live from a few days to a few years, with the whole life cycle completed live from a few days to a few years, with the whole life cycle completed
in 27-375 days. in 27-375 days.
Photo Courtesy of UNIVAR Photo Courtesy of UNIVAR
SAWTOOTH GRAIN BEETLE Actual size 1/8” SAWTOOTH GRAIN BEETLE Actual size 1/8”

Sawtooth Grain Beetle adults are very small and slender, usually under 1/8th inch, dark brown, Sawtooth Grain Beetle adults are very small and slender, usually under 1/8th inch, dark brown,
with saw-like teeth on the prothorax. They feed on flour, bread, breakfast cereals, macaroni, with saw-like teeth on the prothorax. They feed on flour, bread, breakfast cereals, macaroni,
and sugar--just about any dried food products, but any grain kernels have to have been already and sugar--just about any dried food products, but any grain kernels have to have been already
damaged by other pests. The larvae feed on the same material as the adults, and are pale col- damaged by other pests. The larvae feed on the same material as the adults, and are pale col-
ored. While they don’t consume much, their presence alone is enough to consider the products ored. While they don’t consume much, their presence alone is enough to consider the products
they infest unusable. they infest unusable.

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