Root scale insects.
Root scale insects and their egg-laying. This kind of scale insects can not see the plant at all, or find them near the root of the root collar of the plant. The affected plants slow down and stop the growth, the leaves turn yellow, wither and die. The plant will die if no action is taken. If you get a plant from the pot you can see them at an early stage small and then increasingly spreading areas mealy clusters of pests and their metabolic products.
Control measures. As prevention of pests - when transplanting plants should carefully examine the roots. When detected, pests to disinfect the pot, clean the roots from the old land, washed roots of plants in a solution of insecticide and plant in fresh soil.