Sugarcane is ravaged by a number of borer pests but the stalk borer, Chilo auricilius
Dudgeon is most devastating one and acts as main limiting factor in obtaining high cane yield. The cane borers are effectively managed by larval parasitoid wasp, Cotesia flavipes
Cameron. For effective management of borer pest by C. flavipes
needs better understanding the tritrophic interaction between host, plant and parasitoids. So the efficacy of parasitoids can be enhanced by having the idea of relationship among the host plants, pests and parasitoids that is influenced by some volatile chemicals emanated from the plant. In present studies, the olfactory orientation of C. flavipes
in n-hexane based extracts of leaves, healthy cane part and infested cane part extracts of a plant infested by Chilo auricilius
Dudgeon of four sugarcane varieties viz.,
Co0238, CoJ64, CoLk8102 & CoLk94184 was studied in â€œY-tubeâ€ olfactometer bioassay by choice and no choice experiment.
In comparison the extract of all plant parts of four sugarcane varieties, the leaf extract of Co0238 was attracted highest number of C. flavipes
(38) followed by the leaf extract of CoJ64 (35), infested cane part extract of CoLk94184 (35) and infested cane part extract of CoLk8102 (33). The overall trends of wasp attraction were observed in leaf extracts of sugarcane varieties. Among the leaf extracts the Co0238 attracted highest number of C. flavipes
(38) followed by CoJ64 (35), CoLk8102 (32) and CoLk94184 (31). It represents the leaves of plant is one of the major responsible component for guiding the parasitoids to attraction toward the plants. Findings indicate that the sugarcane plant damaged by stalk borer, Chilo auricilius
Dudgeon produces volatile info chemicals that attracted and guiding the parasitoid, C. flavipes
towards the infested plant. It is indicates the long range odors emanating from the infested plants may play role in attracting and guiding the C. flavipes
to locating the C. auricilius
Yeetesh Kumar, MR Singh, YK Yadu, Anupriya Chandrakar and Pankaj Bhargav. Olfactory orientation of Cotesia flavipes Cameron on infochemicals emitted from Chilo auricilius Dudgeon infested sugarcane plant. J Pharmacogn Phytochem 2017;6(5):1639-1644.