Tetranychus urticae Koch induced accumulation of salicylic acid in frijole leaves

The contents of free salicylic acid and conjugated salicylic acid were determined by using TLC and HPLC at different time after attack by Tetranychus urticae Koch in the first true leaf of frijole (Phaseolus vulgaris. L) plant. A maximal nine fold increase in the free salicylic acid content in the attacked leaves was observed. The increase of conjugated salicylic acid was also significant. The content of free salicylic acid in the systemic leaves increased about 500%, while the content of conjugated salicylic acid in the systemic leaves increased by two to three times.