rust mite

US /ˈrʌst maɪt/
UK /ˈrʌst maɪt/
"rust mite" picture
1.

a tiny mite (family Eriophyidae) that causes damage to plants by feeding on their surface cells, leading to a rusty or bronzed appearance on leaves and fruit

:
The citrus trees were heavily infested with rust mites, causing the fruit to turn brown.
Farmers often use specific pesticides to control rust mite populations.