Vol. 9, Issue 3 (2020)

Author(s):
Laxmi Rawat, Dinesh Chandra Naithani, TS Bisht and Ankit Tiwari

Abstract:
Apple (Malus pumila) belonging to family Rosaceae is one of the major fruit crops of Uttarakhand hills affected by various foliar diseases. Foliar diseases of apple have become a major constraint in apple growing areas causing qualitative as well as quantitative losses. The Marssonina blotch/Premature leaf fall is considered as one of the most destructive diseases of apple in Uttarakhand hills. Keeping this in view, a field experiment was carried out to examine the bio-efficacy of Tebuconazole 430 SC at varying doses along with standard check i.e. Metiram 55% + Pyraclostrobin 5% WG @ 10.0 ml/10Lit and Untreated control against Marssonina blotch during two consecutive years i.e. 2017 and 2018 at Harshil in district Uttarkashi, Uttarakhand, India. The field experiment was laid out in randomized block design (RBD) consisting of four replications and five treatments. Field evaluation for two years (2017 and 2018) revealed that after three foliar sprays of Tebuconazole 430 SC @ 7.5 ml/10Lit. of water minimum per cent disease index (22.66% and 19.41% during 2017 and 2018, respectively) and maximum per cent reduction over control (70.47% and 74.12% during 2017 and 2018, respectively) was recorded followed by Tebuconazole 430 SC @ 5.0 ml/10Lit. of water with 62.21 and 68.45% reduction over control (ROC) during 2017 and 2018, respectively. The maximum yield (96.24 q/ha in 2017 and 102.52 q/ha in 2018) was again recorded in the same treatment i.e. Tebuconazole 430 SC @ 7.5 ml/10Lit. of water followed by the same chemical @ 5.0 ml/10Lit. of water concentration.