Effect of plant age on cotton leaf curl disease (CLCuD) in relation to environmental conditions

The effect of cotton leaf curl disease (clcud) and weather variables were studied using same genotypes of cotton,planted at 15 days interval during 15th,23rd standard weeks of 2010-2011. on an average basis,the 15th standard week planting showed,significantly,less disease incidence than all other sowing dates. the incidence increased as the sowing was delayed up to 23rd standard weeks. among the sowing dates,regardless of genotypes,disease incidence differed,significantly. the clcud boost up during 25th to 29thstandard (2010) and 27 th to 31st standard (2011) weeks of the year,regardless of sowing date and genotypes. disease incidence was low during 2011 as compared to 2010. the disease increased sharply during 2010 and gradually during 2011. average maximum (34.8~39.8 °c),minimum (27.7~28.9 °c) temperature and relative humidity (62~79%) favoured clcud progression.