Evaluation of post-symptom activities of fungicides against Marssonina coronaria causing premature leaf fall in apple

Authors

  • A. KUMAR* and J.N. SHARMA

Keywords:

Apple, conidial production, fungicides, germinability, Marssonina coronaria, probable number of viable conidia

Abstract

Experiments were conducted to evaluate the effect of post-symptomatic fungicide application on conidial production (Cp), germinability (Cg) and probable number of viable conidia/lesion (PNVC) of Marssonina blotch of apple caused by Marssonina coronaria. Fungicides from seven chemical classes were evaluated for their effect on Cg, Cp and PNVC on 1st, 3rd, 5th, 7th, 9th and 14th day after spray. Two sprays were given under each treatment at 7 days interval. All the fungicides significantly reduced Cg, Cp and PNVC with control at all the times of observation. Inhibitory effect on Cp, Cg and PNVC was recorded highest on the first day of observation after each spray thereafter, gradual decrease was recorded. It was observed that under higher disease pressure this pathogen requires repeated applications of fungicides to bring down the level of PNVC for further spread of the disease. All the treatments inhibited Cp and Cg to greater extent after second spray as compared to after their first application. The quinine outside inhibitor (QoI) fungicide (kresoxim methyl) exhibited significantly lowest Cp, Cg and PNVC over control with no phytotoxicity on apple leaves at used concentrations (0.025, 0.05 and 0.1%). Strobilurins were closely followed by benzimidazoles and dodine. Triazoles showed average results whereas, dithiocarbamates, shield, copper oxychloride and captan showed poor results in this respect. Strobilurin fungicide kresoxim methyl (0.1%) found most effective exhibited least average PNVC (0.03-0.12x104 conidia ml-1) of M. coronaria whereas, control registered highest (17.01x104 conidia ml-1). Therefore, strobilurins can be recommended for the effective management of Marssonina blotch of apple.

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Issue

Vol. 69 No. 3 (2016): Indian Phytopathology

Section

Research Articles

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How to Cite

and J.N. SHARMA, A. K. (2016). Evaluation of post-symptom activities of fungicides against Marssonina coronaria causing premature leaf fall in apple. Indian Phytopathology, 69(3), 278. http://epubs.icar.org.in/ejournal/index.php/IPPJ/article/view/60158