Grain Mite

Species category:Mites

Family: Acaridae

2 different species:
1. Grain mite - Lepidoglyphus destructor
2. Storage/Mould mite - Tyrophagus longior

Just visible to the naked eye, these mites reach 0.5mm in length and can be seen moving slowly on the surface of grain or associated produce. Grain mites are commonly a pale, grey to white colour.

Larvae have 6 legs and they increase to 8 legs during the nymph to adult stage.

Have a wide distribution, especially in warmer climates. However, they can be found in warm grain stores worldwide.

They thrive in warm, moist conditions and prefer humidity levels of 80% with an optimum temperature of 20oC. These mites will survive colder conditions but will die without moisture.


Both species require a high moisture habitat and are common in food processing where stored produce is kept at a high humidity level, which also results in fungal growth.

A female will lay hundreds of eggs during the course of her lifecycle. Eggs are laid daily and are distributed singly or scattered across the surface of the grain. Egg to adulthood is a short phase so an infestation can take hold quickly.

These mites have a unique phase in the lifecycle called the hypopus, this is a nymphal resting stage, where the young mites don’t feed and are more resistant to control measures.

The Grain Mite feeds on a wide variety of products, cereals, dried vegetable materials and dried fruits.

Mite populations in grain stores can build up very quickly. They have a preference for feeding on the cereal germ and contaminate grain with allergens that adversely affect its palatability. They also feed on mould and spread fungal spores, further damaging the grain.

Other Problems

Indian Meal Moth

Stored Product Pest

Stored product pests fall into two main insect orders:...

Read more
Lesser Grain Borer

Lesser Grain Borer

In Australia and India, it is a serious pest of grains....

Read more

Indian Meal Moth

The Indian Meal Moth is a tropical or subtropical species...

Read more
Lesser Mealworm (adult) - Pest Management Bayer

Lesser Mealworm

This pest favours humidity and warmth and is most prevalent...

Read more
Sawtoothed Grain Beetle

Saw Toothed Grain Beetle

One of the most common pests affecting stored grain...

Read more
Rice Moth - Pest Control - Bayer

Rice Moth

The Rice Moth has a pale, buff-brown colour which is...

Read more
Grain Weevil

Grain Weevil

Grain weevils do not fly but instead, infestations often...

Read more