Abstract: Tetranychus urticae is an important pest of kidney bean. The physiological indexes of kidney bean were tested after it was infested by T. urticae at different population densities and attacking durations. The results showed that chlorophyll a, chlorophyll b and total chlorophyll content changed little after infestation of T. urticae at low density (2 mites·leaf^-1) and short time (<5 days), but deceased significantly with the increasing pest density and feeding duration. The contents of reducing sugar and total sugar were closely related to the damage degree of pests. The reducing sugar content decreased more greatly with the increase of attacking duration and damage degree, while the total sugar increased firstly and decreased later. The total phosphorus and potassium contents in the leave of kidney bean decreased remarkably with the increasing of  infestation, but the nitrogen content didn’t change significantly.

Key words: plant soil , sewage sludge utilization., municipal sewage sludge, system