The lesser grain borer is one of the most damaging insect
pests of stored wheat.
Beneficial insects: these small parasitic wasps find beetle
larvae inside wheat kernels, paralyze them, and lay eggs
on them. These eggs develop into new wasps.
Insect damaged kernels or IDK can cause major losses in value of the grain.
Lesser grain borer larva inside a wheat kernel. These
larvae develop inside the kernel and cause fragments in
Power vacuum sampling proved to be the best way to sample
grain for insects. Four-foot sections of tubing can be
added to the probe as it is pushed down into the grain.
Grain is normally sampled to a depth of 40 feet.
The power vacuum sampler consists of a vacuum pump powered
by a gasoline engine mounted in a trailer. A hose runs
from the trailer to the top of the elevator, where it
connects to the probe unit.
Technician using an inclined sieve to separate insects
from grain samples. Insects are later identified and counted,
and results entered into SGA Pro.
Vertical Distribution of three insect species in concrete
silos in November. Most insects were found in the top
14 meters of grain.