Bioefficacy studies of new fungicide molecules (Proquinazid 20 EC) against powdery mildew of apple

Abstract

Powdery mildew disease is one of the most important diseases in apple caused by Podosphaera leucotricha (Ell. and Ev.). The present investigations were undertaken at Ambri Apple Research Center Shopian, SKUAST-Kashmir during 2015 and 2016 to assess the field evaluation of new fungicide molecule; Proquinazid 20EC, for the management of Powdery mildew disease in Ambri Apple. Field evaluation for two seasons revealed that three sprays of Proquinazid 20EC @ 0.025 completely controlled the disease and recorded 0.0 per cent disease incidence and disease intensity. The fungicide was also effective at 0.02% concentration and recorded 4.2 and 1.0 per cent disease incidence and intensity, respectively, which was lesser than the standard fungicide, Sulphr 80% WP @ 0.2% concentration. The highest yield (29.70t/ha.) was also observed in Proquinazid 20EC @0.025% followed by the same chemical at 0.02% concentration. The results also showed that Proquinazid 20EC even at higher doses (0.04 and 0.08%) did not manifest any Phytotoxicity symptoms and also exhibited an appreciable increase in fruit yield of Ambri apple.