Root Mealybugs are white waxy insects which localise and feed on the roots of plants. Because of their tendency to attack plant roots, they're not often noticed until plants are damaged significantly.
They're a highly general group and can be found on a wide variety of hosts. In colder locations, they're restricted to plants grown indoors and under glass.
Symptoms involved stunted or slowed growth, but please note slowed growth is normal during colder seasons! You may also notice reduced vigour, and white 'fluffy' masses on the roots when plants are pulled up. Slow-growing or plants already under some other environmental stress are more susepable to dying.
Root Mealybugs won't be found in UK gardens, however, may attack houseplants or those grown in greenhouses.