EFFECT OF CALIXIN AND KARATHANE ON DEVELOPMENT OF MILDEW EPIDEMICS ON PEA
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Authors
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S. P. MISHRA AND ASHOK KRISHNA
J. N Agricultural University, Agriculture College, Khandwa (MP) 450 001
Keywords:
Powdery mildew, Inoculation, Epidemics, Pea, Calixin, KarathaneAbstract
The effect of calixin and karathane as pre- and post-inoculation single sprays at 0.05 per cent a.i. was studied for three crop seasons (1983-86) on the development of mildew epidemics (Erysiphe pisi D.e.) on pea. Sprays 4 days prior to inoculation resulted in delayed start of the epidemics but allowed it to develop at a faster infection rate. Disease control from 24.22 to 51.81 per cent was obtained in comparison to unsprayed plots (calculated on the basis of iR,). Greater effectiveness of fugicides as pre-inoculation sprays was evident from reduction in conidial germination, greater incubation and latent periods, fewer and smaller colonies and reduced conidial yield.
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