Lesser grain borer

Ppt

1. Lesser Grain Borer Rhyzopertha dominica Coleoptera : Bostrichidae

2. Description Adults The adults are 0.1 inch long. Brown to black beetles with cylindrical bodies. Numerous small pits on the wing covers . Head is directed downward and covered by the prothorax

3. Grub Creamy white. C-shaped Small dark head that is partly retracted into the thorax . Thorax has three pairs of small legs. 

4. Damage Lesser grain borers mainly attack wheat, corn, rice and millet . Both the larvae and adults are  primary pests .  Larval and adult feeding in and on grain kernels.

5.   Leave only dust and thin brown shells . A sweet, musty odor is often associated with infestations of this insect.

6. Biology Female deposits her eggs in clusters of 2 to about 30 on kernels . Newly-hatched larvae chew into kernels and complete their entire development there .   The larvae can feed on fines or can develop as free-living insects in the grain. 

7. Both the larvae and adults produce a large amount of frass or waste . Larval fecal pellets are pushed out of the kernel and large amounts can accumulate in the grain.

8. 5-6 days 40 days 7 days

9. CONTROL Economic thresholds 1 insect / qt of grain.   DFORCE AEROSOL applying to cracks and crevices where both adults and larva like to reside.