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The present investigation was conducted to evaluate Pseudomonas fluorescens and neem oil alongwith eight synthetic insecticides such as, Acephate 75 SP, Pseudomonas fluorescens, carbosulfan 25 DS, carbosulfan 25 EC, dimethoate 30 EC, ethofenprox 10 EC, imidacloprid 17.8 SL, monocrotophos 36 SL, neem oil and phosalone 35 EC as seed treatments at 10 ml or gm per kg of seeds against Amrasca devastans in cotton. In the experiment conducted at the research farm, imidacloprid, monocrotophos and P. fluorescens were found to be effective in reducing the leafhopper population by more than 50 per cent. Imidacloprid was found to be the most effective treatment recording the least population of 0.8/3 leaves and was followed by monocrotophos (1.23/3 leaves) which was on par with P. fluorescens (1.42/3 leaves). All other treatments were unable to reduce the leafhopper population by less than 50 per cent. In another On Farm Trial (OFT) conducted at Thirupanikarisalkulam, leafhopper population appeared 10 DAS and increased steadily. All the seed treatments were able to reduce the leafhopper population. Imidacloprid was found to be the most effective one recording the least mean population of leafhoppers (0.53 /3 leaves). Imidacloprid and monocrotophos were able to reduce the leafhopper population by 72.54 and 59.59 per cent respectively. Other treatments viz., acephate, P. fluorescens, phosalone, ethofenprox, dimethoate, neem oil, carbosulfan EC and carbosulfan DS resulted in less than 50 per cent reduction in leafhopper population compared to untreated check. Laboratory studies have shown that imidacloprid, monocrotophos and P. fluorescens improved germination and increased shoot length. Whereas neem oil had adverse effect on shoot length.
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