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Bio-chemical parameters influencing the castor plant resistance to the green leafhopper (GLH), Empoasca flavescens (Fabr.) (Homoptera: Jassidae) has been studied during 2016-17. Analysis was conducted to compare the varietal differences of castor in relation to resistance or susceptibility to attack by GLH. Bio-chemical characters include proteins, phenols, total free amino acids, total carbohydrates in the leaves of castor. Among, bio-chemical constituents, phenol content had significant negative correlation with leafhopper population and hopper burn scores. Total carbohydrates content had significant positive correlation with leafhopper population. Total free amino acids content had significant negative correlation with hopper burn scores. Proteins had no significant association with both leafhopper population and hopper burn scores.
Key words: Bio-physical, Bio-chemical, Green leafhopper Empoasca flavescens.