The combination of P. membranaefaciens with HWT was as effective as the fungicide treatment in
natural infection trials. Application of HWT did not affect the growth of P. membranaefaciens in the
wounds of citrus fruit at 20 C or 4 C. P. membranaefaciens combined with HWT effectively enhanced the
phenylalanine ammonia-lyase, peroxidase, polyphenoloxidase, chitinase, and b-1,3-glucanase activities
and stimulated the synthesis of phenolic compounds. These results suggest that the use of HWT is a
useful approach to improve the efficacy of P. membranaefaciens in postharvest diseases of citrus fruit.