Vol. 11, Issue 3 (2022)

Author(s):
Kirtipal Singh, Jagan Nath Sharma, Bhupesh Kumar Gupta and DP Bhandari

Abstract:
Botryosphaeria dothidea causes stem brown canker is among the most important apple canker diseases, causing widespread losses in apple production. Enormous occurrences of stem brown canker were observed in the Kinnaur, Kullu, Mandi, Sirmaur, and Shimla districts of Himachal Pradesh, at elevations ranging from 1000 to 2500 meter above mean sea level (A.M.S.L.) during the regular canker development season, from May to December in 2017 and 2018. The incidence of stem brown canker was maximum (41.05%) at Narkanda in Shimla district followed by Nohradhar of Sirmaur district (38.32%), whereas disease was totally absent in some places namely, Kumarsain, Maraog, Matiyana, Karsog and Nihri. percent disease index of stem brown canker was maximum at Narkanda (21.91%) followed by Rajgarh (16.60%) in Sirmaur district, while minimum percent disease index (0.00%) was recorded from Karsog, Kumarsain, Matiyana, Maraog and Nihri. The percent disease index of stem brown canker ranged from 0.00 to 21.91 per cent disease index during 2017 and 2018 crop seasons.