The present investigation was conducted in green house to study the effect of different coloured LEDs (Red, green, White, Blue and UV light) on the subsequent occurrence of Fusarium wilt in Pigeonpea seedlings whose the seeds were treated with different coloured lights prior to sowing. The seeds treated with red LEDs for 12 and 24 hrs and blue light for 24 hrs prior to sowing reduced the Fusarium wilt by upto 71 percent over control. The disease incidence was recorded after 45 days of inoculation with Fusarium udum culture was 14.58 per cent in Asha and 46.94 per cent in TAT-10 respectively.

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