New Horizons in Insect Science Towards Sustainable Pest Management

264 V. K. Lingaraj et al.

ation process because phenols act as IAA oxidase
inhibitors (Amudhan et al. 1999 ), resulting in hy-
perauxinity in gall tissue that leads to formation
of nutritive tissue on which the gall formers feed.

Proline

On the day of infestation significant differences
were observed between the resistant and suscep-

tible genotypes (Fig. 2 ). Further, the day of in-

festation had a significant effect on the proline

content in all the genotypes observed. Among the

genotypes, significantly higher, rapid accumu-

lation of proline on the third, fifth and seventh

day after infestation was observed in the infested

susceptible genotypes. In resistant genotypes this

phenomenon was not evident. On the third day

after infestation, the proline content in suscepti-

ble genotypes viz., Jaya IR 20 and TN 1 was 3.70,





















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Fig. 2 Effect of gall midge infestation on total proline (days after infestation)



















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Fig. 1 Effect of gall midge infestation on total phenols (days after infestation)