Effect of environmental conditions, salicylic acid and phytohormones on pea leaf blight
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Authors
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ANITA GAHALAIN, PRAMOD KUMAR, J.C. BHATT S.D. DUBE and V.S. CHAUHAN
Vivekananda Parvatiya Krishi Anusandhan Sansthan (ICAR), Almora 263 601
Keywords:
Salicylic acid (SA), phytohormones, leaf blight, pea, air mycofloraAbstract
Field trials were conducted during rabi 1996-97 at the Vivekananda Parvatiya Krishi Anusandhan Sansthan, Experimental farm, Hawalbagh, Uttar Pradesh, India, to study the effect of salicylic acid and phytohormones (GA, kinetin, NAA, Ethrel [ethephon]and ABA) on leaf blight of pea (cv. VL Matar 1) caused by Alternaria alternata. A foliar spray of 100 ppm salicylic acid (SA) in combination with phytohormones resulted in increased yield and disease reduction except for the 100 ppm SA+20 ppm kinetin treatment. The greatest reduction in disease was recorded when the plants were sprayed with 100 ppm SA+10 ppm ABA (60.56%) followed by 100 ppm SA alone (37.89%) and 100 ppm SA+100 Ethrel (30.46%). However, SA in combination with other phytohormones (GA, Kinetin, NAA) were not effective. The highest yield was obtained with 10 ppm ABA (27.85%) followed by SA in combination with other phytohormones. Leaf blight severity was positively correlated with percentage air spora of A. alternata (r=0.872) and atmospheric temperature (r=0.741) whereas, it was negatively correlated with humidity and rainfall (r=0.55, -0.055).
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