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Integrated Host Plant Resistance and Fungicide Application on Leaf Blight Control in Menthol Mint (Mentha arvensis L.)

Karla, A., Singh, H.B., Patra, N.K., Kumar, Sushil
Journal of herbs, spices & medicinal plants 2002 v.10 no.2 pp. 83-87
Alternaria alternata, Mentha arvensis, chlorothalonil, crop losses, crops, cultivars, disease outbreaks, essential oils, host plants, leaf blight, menthol, mint, pesticide application, planting, India
The effects of host resistance and fungicide (chlorothalonil) applications on leaf blight (Alternaria alternata (Fr.) Keissler) disease on the transplanted crops of menthol mint (Mentha arvensis L.) were evaluated under natural epidemics in Tarai region of Uttar Pradesh, India. Essential oil yields were reduced 36 percent in susceptible plants (cv. Shivalik) not treated with fungicide as compared with control plants protected by fungicide. The corresponding yield loss in leaf blight resistant plants (cv. Kosi) was only 13 percent as compared with plants not treated with fungicide. The combined effects of the host resistance and the fungicide application resulted in 91 percent increase in essential oil yields compared with unsprayed susceptible plants. The results suggest that planting disease resistant cultivars could prevent most crop losses and minimize the amount of fungicide needed to adequately protect M. arvensis crops even in high blight years.