Author(s):

V Abdul Rasheed, SR Koteswara Rao, T Ramesh Babu, T Murali Krishna, BV Bhaskara Reddy and G Mohan Naidu

Abstract: Studies on biochemical constituents of different tomato genotypes were estimated during Rabi 2016-17 and 2017-18 to identify the resistance/susceptibility to Tuta absoluta (Meyrick). Correlation studies of biochemical constituents with infestation of T. absoluta on different tomato genotypes revealed that, the phenol content in the leaves of tomato genotypes was found to be negatively associated with the T. absoluta infestation. Moderately resistant genotypes EC-620410, EC-620401 with 10.45, 13.21 per cent infestation on leaflets and 0.83, 1.00 larvae per compound leaf possessed high phenol content 5.27 and 5.28 per cent, respectively as compared to highly susceptible genotype EC-160885 (1.92%) which exhibited maximum infestation on leaflets (37.16%) and 3.40 larvae per compound leaf. The protein content in the leaves was found to be positively associated with the infestation of T. absoluta on tomato genotypes. The protein content in the leaves of moderately resistant genotype EC-620410 (1.64%) was significantly lower and in highly susceptible genotype EC160885 (8.32%) was significantly higher. The correlation between the reducing sugars and infestation of T. absoluta on leaflets, fruits and number of larvae per compound leaf was positive and significant, which indicated that increase in reducing sugar increased the infestation of T. absoluta. The lycopene content in fruits was found to be positive and non-significant association with the damage on fruits by T. absoluta in tomato genotypes.

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