Investigation on An tifeeding and Ovipos iting-repelling Activ ity of the Plant Coryda lis shearer i again st Two Lepidoptera In sects

Liquid-liquid part it ioning and column chromatography were applied,respect ively, to separate chloroform extract of the who le plant of Coryd alis sheareri to find ant ifeeding substances for insect cont ro l in cabbage field. The benzene fract ion of the liquid-liquid part it ioning was found to be the most active against the larvae of Plutella xy lostella and Pieris rapae, with the rate of antifeeding, at × 50 dilut ion, of 97.7% and 97.3% ,respectively, after 12 h exposure. The fract ion also showed high egg-repelling activity to the adults. More pure fractions were is olated by silicagel column chromatography. The most active one had 93.0% ant ifeeding rate at ×200 dilution towards Pierisrapae. The chem ical const ituents of the above-ment ioned extracts were discussed based on the published data.