Effect of Wind!induced Mechanical Stress on Soluble Peroxidase Activity and Resistance to Pests in Cucumber

Wind!induced mechanical stress "MS# signi_cantly increased the soluble peroxidase activity in leaves of cucumber over control levels after 8 days of treatment[ In comparison\ inoculation with the fungal pathogen Cla! dosporium cucumerinum induced signi_cant increases in peroxidase after 3 days[ Cucurbit anthracnose symptom development caused by Colletotrichum orbiculare was greater on leaves of seedlings exposed to 5 but not to 8 or 01 days of wind!induced MS than on leaves of control plants[ In contrast\ reproduction of melon aphids was signi_cantly reduced on leaves exposed to 01 days of MS relative to controls[ These results indicate that wind! induced MS can induce soluble peroxidase activity in cucumber and have divergent e}ects on the resistance to insects and pathogens[