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ISHS Acta Horticulturae 696: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics - Part Two

CHEMICAL CONTROL OF POWDERY MILDEW OF APPLE IN WARMER CLIMATES OF HIMACHAL PRADESH, INDIA

Authors:   D. Gupta, J.NL Sharma
Keywords:   apple, powdery mildew, fungicides, Podosphaera leucotricha
DOI:   10.17660/ActaHortic.2005.696.61
Abstract:
Powdery mildew of apple caused by Podosphaera leucotricha is a serious nursery disease in Himachal Pradesh and is fast spreading in the orchards under warm climatic conditions. Experiments were conducted during 2001 and 2002 seasons at Kotkhai, Shimla (1750 m amsl) to study the effect of hexaconazole (0.05%), iprodione + carbendazim (0.15%), carbendazim (0.05%), penconazole (0.05%), myclobutanil (0.05%), mancozeb + carbendazim i.e. Companion, SAAF, Calibre @ 0.25 per cent, thiophanate methyl (0.05%) and sulphur (0.25%) on powdery mildew of apple. These fungicides were sprayed at 14 days interval with the first spray commencing at 4-6 leaf stage. Spraying was stopped when the rains ensued. The final assessment on disease was made in the apple nursery 5 days after last application. Myclobutanil (0.05%), penconazole (0.05%) and hexaconazole (0.05%) were the most effective fungicides in reducing the disease significantly over check. On an average in the apple nursery, myclobutanil provided 97.12 per cent control over check followed by penconazole (92.49%) and hexaconazole (82.90%). In apple orchards, hexaconazole (0.05%), myclobutanil (0.05%) and fluquinconazole (0.03%) provided 100 per cent disease control.

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