Internal Feeders

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• Insect larvae
• Feed within kernals of whole grain

Examples:

• Angoumois grain moth
•  grainary weevil
•  lesser grain borer
•  rice weevil

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External Feeders

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• Insects that feed on external part of grain
• They also may chew through outside shell to eat the inside part of the grain

Examples:

• Cadelle
• Cigarette beetle / tobacco beetle
• Drugstore beetle
• Flat grain beetle
• Indianmeal moth
• Khapra beetle

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Scavengers

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• Insects that feed only on grain which has its outer coat has been broken

Examples:

• Confused flour beetle
• Mediterranean flour moth
• Red flour beetle
• sawtoothed grain beetle

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Secondary Pests

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Insects that feed on materials that are

• deteriorating
• damp
•  may have mold

Examples:

• Foreign grain beetle
• Grain mites
• psocids
• Yellow mealworm

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