Abstract
Predictive models based on data acquired by near infrared (NIR) spectrophotometry suggest that components in extracts from sugarcane nodal budscales contribute towards resistance to the stalk borer Eldana saccharina. NIR spectra for 60 sugarcane clones varying in resistance to E. saccharina indicated that chlorogenates and flavonoids might be involved in the NIR calibration and also in the interaction between the insect and sugarcane. Two extreme types of flavonoid profile subsequently were revealed, one associated with resistance and the other with susceptibility. Incorporation of the susceptible type profile into a defined synthetic diet increased feeding initiation and subsequent survival of first instar larvae compared with the resistant type profile. NIR calibrations proved capable of predicting the resistance ratings of validation sets.
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