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INTRODUCTION. The merchant grain beetle is very similar to the sawtoothed grain beetle in appearance, life cycle, and habits.  For years they were considered 1 species until breeding experiments showed they were 2 different species.  This pest is worldwide in distribution and can tolerate the cooler climates.

RECOGNITION. Adults about 1/8in (3 mm) long, with flattened body.  Color dark brown.  With 6 sawlike teeth on each side of prothorax.  Length of temple (region directly behind eyes) less than half the vertical diameter of eye.  With well-developed wings, and known to fly.

     Mature larva yellowish white.  Less than 1/8in (3 mm) long.  Elongate, without urogomphi (paired processes projecting from last abdominal segment), relatively smooth.  Antennae 3-segmented with 2^nd segment longest and 3^rd very small.  The sawtoothed, foreign, and squarenecked grain beetles share this same description.

 

 

 


HABITS. The merchant grain beetle cannot attack sound kernels.  Its flat body form permits access through very small cracks and into imperfectly sealed packages.

     Adults can fly and they are attracted to light.

     It is not commonly found in grains, but appears to prefer oilseed products, including nuts and cereal products.  It most commonly attacks cereals including rolled oats, rice flour, cake mixes, macaroni, and cookies.  It has also been found infesting nuts, coconut, and candy bars made with peanuts and puffed rice.

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