Bioefficacy of Pesticides Against Aphelenchoides besseyi and Sensitivity of Tuberose Bulbs to Hot-Water

Bioefficacy tests with neem-based formulations on Aphelenchoides besseyi population infecting tuberose showed that azadirachtin at 1% and 5% was found nematicidal, caused 27% to 42% mortality after 2 h of exposure. Among synthetic pesticides tested, monocrotophos 36 SL showed killing to the extent of 41% while cartap hydrochloride 50WP and carbosulfan 25EC showed up to 14% killing effect at relatively higher concentration (0.2%) after 2 h of exposure. Among the formulations of pesticides tested against A. besseyi, none of synthetic chemicals was found promising except monocrotophos. The results on temperature sensitivity of tuberose bulbs to hot-water showed that bulbs were highly sensitive to the exposure of hot-water temperature and germination of tuberose bulb was not affected at temperature of 50± 2⁰C for 30 min. but at 54⁰C about 80% and at 58⁰C to 60⁰C, cent per cent germination of bubs was lost.