Author(s):

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

Abstract: Biophysical parameters of different tomato genotypes were estimated during Rabi 2016-17 and 2017-18 to identify the resistance/susceptibility to Tuta absoluta (Meyrick). The leaflet length and width were significantly lower in moderately resistant genotypes EC-620410, EC-620343 and EC-620401 with 2.68 cm and 1.31 cm, 2.74 cm and 1.44 cm and 3.06 cm and 1.63 cm, respectively whereas significantly higher in highly susceptible genotypes EC-160885 and EC-620433 with 7.08 cm and 3.13 cm and 6.35 cm and 3.01 cm, respectively. The leaflet thickness and trichome density were significantly higher in moderately resistant genotypes EC-620410, EC-620401 and EC-620343 with 0.35 mm, 0.34 mm and 0.33 mm and 466.50, 408.66 and 431.67 per 0.25 cm², respectively, whereas leaflet thickness and trichome density were significantly lower in highly susceptible genotype EC-160885 (0.18 mm and 128.17 per 0.25 cm², respectively).The moderately resistant genotypes EC-620410, EC-620401, EC-538153 and EC-164577 with highest SCMR values of 44.40, 42.25, 42.18, and 41.78, respectively, with lowest T. absoluta infestation whereas highly susceptible genotypes EC-620433 and EC-160885 recorded lowest SCMR values 31.99 and 31.91, respectively. The significant positive correlation was observed between leaflet length, width and with the infestation of T. absoluta on leaflets, fruits and larvae per compound leaf whereas leaflet thickness, trichome density and SPAD chlorophyll meter reading (SCMR values) were found to be significant negative correlation.

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