Effect of fungicides, botanicals, bioagents and organics on inhibition of sporangial germination of Pseudoperonospora cubensis (Berk. and curt.) Rostow.
Abstract
Pseudoperonospora cubensis (Berk. and Curt.) Rostow is a causal agent of downy mildew of gherkin or pickling cucumber (Cucumis sativus L.). The efficacy of fungicides, botanicals and bioagents against spoarangial germination of P. cubensis, was studied under in vitro conditions during 2010. Among fungicides Fenamidon 10% + Mancozeb 50%WP (Sectin 60 WP) (98.41%) was superior in inhibiting the sporangial germination at 0.2% concentration which was at par with Metalaxyl 8% + Mancozeb 64% WP (Ridomil-MZ 72 WP) (97.73%). Among botanicals Garlic (Allium sativum) bulb extract (82.26%) was found to be superior in inhibiting the sporangial germination at 10 per cent concentration followed by Pongamia leaf extract (76.30%). Among organics maximum inhibition of sporangial germination was observed in panchagavya (38.07%) at 10 per cent concentration. Among bioagents Pseudomonas fluorescens (10.24%) was found to be superior in inhibiting sporangial germination at 6% concentration.
Keywords
Gherkin, Pseudoperonospora cubensis, Fungicides, Botanicals, Organics, Sporangial germination, Inhibition
