Vol. 76 No: 5

Title:
The effect of leaf spot, rust and powdery mildew on yield components of nine Japanese mint (Mentha arvensis) genotypes

Authors:
A. KALRA, H.B SINGH, N.K. PATRA, R. PANDEY, R.S. SHUKLA and SUSHIL KUMAR

pp: 546-548

Abstract:
Leaf damage caused by natural infection by Alternaria alternata (leaf spot), Puccinia menthae (rust) and Erysiphe cichoracearum (powdery mildew) on nine Japanese mint genotypes grown at Pantnagar in the Terai region of India was assessed over two years. The cultivars Himalaya and Sel-3 proved tolerant to the pathogens whereas cultivars Shivalik and Gomti were highly susceptible. Defoliation in the plots unprotected by fungicides was 2.9 times greater than in fungicide-protected plots. The average reduction in the leaf:stem ratio, oil content and content of menthol in the essential oil was 7, 8 and 3% respectively. Yield components of the susceptible cultivars Shivalik and Gomti were affected by as much as 25%, but the effect on the resistant cultivars Himalaya and Sel-3 was not significant. Rust and leaf spot affected the quality of the essential oil of susceptible varieties.

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