Vol. 11, Issue 10 (2022)

Author(s):
AD Matte, MJ Patil, SV Gawarkar and VD Pawar

Abstract:
Among the flower crops rose is the most important flower crop grown throughout the world. In terms of area cultivated and production, it is perennial high input crop with more economical in cultivation and gives maximum income to the farmer. Rose suffers from many foliar diseases. Among them black spot caused by Diplocarpon rosae is major destructive disease. It appears in epidemic form almost every year in varying intensity leading to greater yield losses. Most of the rose varieties were reported susceptible to this disease. Therefore, it was necessary to obtain the information on disease initiation, symptoms and management by using different fungicides and estimation of their economics. In the present study of investigation efficacy of various fungicides viz., Azoxystrobin 0.1%, Mancozeb + Carbendazim 0.2%, Topsin 0.05%, Myclobutanil 0.1%, Tebuconazole 0.1%, Chlorothalonil 0.2%, and the bioagent T. viride 0.2% were evaluated in vivo and their economics was computed. After third spray, minimum percent disease intensity was recorded by Chlorothalonil 0.2% (11.23 PDI) and Topsin M 0.05% (13.50 PDI) and both these treatments were at par with each other. Next promising treatment was Myclobutanil 0.1% followed by Mancozeb + Carbendazim 0.2%, Azoxystrobin 0.1%, T. viride 0.2% and Tebuconazole 0.1% recording 15.32, 18.13, 21.10, 25.24, 30.27 PDI respectively.