Abstract: Cantaloupe ‘Yujinxiang’was treated with different silicon agents to study their imfluence on muskmelon pink mold rot . The results showed that : Sodium silicate and ethyl ester silicate was effective in suppressing the redial growth of T. roseum by way of in vitro tests while nanosize silicon oxide was ineffective. By menas of in vivo tests , both sodium silicate and nanosize silicon oxide reduced the severity of pink rot of the cantaloupe. Whenn the concentrations of both silicon agents were at 50 mmol/ L , the lesion diameters in treated
melons significantly decreased ( P < 0.01) compared with those in the control groups. Enhanced POD and PAL activities were observed in sodium silicate-treated melons but not in those treated with nanosize silicon oxide. Ethyl
ester silicate and higher concentration sodium silicae made a different-degree injury on melons.

Key words: Melon, Cantaloupe, Silicon agents, POD, PAL, Muskmelon pink mold rot