Onion maggots are very small measuring around 9mm. The adult is a fly that is about 9mm long, greyish coloured with large wings. 

Onion Maggot-Later’s, Maggots & Pupae-Jack Kelly Clark

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I don’t suppose it would help much to describe these gross little pests :-). Here it is anyway…..slugs are long snakelike mollusks that have a slimy coating. 

Slug-General Exterminators Inc. (left), Slug-Maine Pest Management Lab (right)

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Flea beetles are very small (3-5mm) and are various colours ranging from yellow, brown, grey to black. 

Flea Beetles-Iowa State University Entomology Department

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Mealy bugs are very small (3-6mm) white fuzzy bugs. They look like tiny fluffs of cotton. 

Mealy bugs (left)-Biopol Biosystems, Mealy bugs on ornamental (right)-University of California

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