Granary Weevil
(Sitophilus granarius)
Description: Cylindrical, shiny red-brown to black body, about 1/13” - 1/8” long; long head with distinct snout; ridged wing-covers, thorax marked with oval pits; flightless; cold tolerant.
Life Cycle: Minimum 28 days
Feeding Habits: Adults feed on whole and broken kernels; larvae grow from eggs deposited inside kernels.
Signs of Infestation: Live adult weevils, and damaged grain with “shot hole” appearance.
Control Tips: Clean and spray grain bins with Gravista® Insecticide prior to grain storage. For treatments of six months or longer, inspect and treat incoming grain with Gravista® Insecticide; monitor grain throughout storage period. To bring a boost to short-term grain storage of six months or less, and for rescue treatments, treat with Centynal™ Synergized Insecticide.
Application Tips: When treating flowing grain on belts or at transitions, 2 or more nozzles are recommended; during auger or conveyor cup application, fewer nozzles may be used; position nozzles for full coverage of grain stream; avoid spraying onto sides of auger boots. Calibrate protectant flow rate and check often to help ensure proper application. Use automated switches to turn chemical pumps on when there is grain in the system and turn off when no grain is present.
Recommended Products
Centynal™ EC Insecticide
This stored grain insecticide can be used in empty grain bins/silos and on grain to knockdown weevils and other pests to prevent bugs in grain.
Centynal™ Synergized Insecticide
Centynal™ Synergized Insecticide brings a boost to short-term grain storage and rescue treatments by combining both an adulticide and a synergist.
Diacon® IGR
Diacon® IGR is approved virtually everywhere stored product insects are a problem. Diacon® IGR interrupts the life cycle, providing long-term control.
Diacon® IGR PLUS
This stored grain insect control contains an adulticide and insect growth regulator for quality grain protection to help get rid of weevils and other pests.
Gravista® Insecticide
Featuring 3-in-1 insect control with an adulticide, an insect growth regulator (IGR) and a synergist, Gravista® Insecticide kills labeled insects and breaks their life cycles.
Gravista®-D Insecticide
Gravista®-D Insecticide helps provide the end-user with a ready-to-use solution for protecting post-harvest stored grains from weevils and other costly insects. Ideal for on-farm storage, Gravista®-D Insecticide is the only dual-purpose, dry product on the market that combines a synergized adulticide with an insect growth regulator.
PBO-8® Synergist
A synergist for many classes of insecticides, PBO-8® works by blocking production of mixed-function oxidase enzymes.
Tank Mix Options
Applying a tank mix of Diacon® IGR and Centynal™ Insecticide to your stored grains helps provide control of stored product insects.
