Comparative economics of spray scheduling for the management of late leaf spot of groundnut incited by Phaeoisariopsis personata

Authors

  • UTPAL DEY*, D.N. DHUTRAJ, A.P. SURYAWANSHI, ANUP DAS and S.P. DAS

Keywords:

Arachis hypogaea, defoliation, late leaf spot, management, Phaeoisariopsis personata, pod yield, severity

Abstract

Late leaf spot (LLS), caused by Phaeoisariopsis personata, a foliar disease of groundnut or peanut (Arachis hypogaea) is one of the important factors limiting groundnut productivity in India. It frequently inflicts colossal yield losses of more than 50% on unsprayed peanuts. The current studies emphasized upon the management strategies to mitigate the losses caused by the disease. Among the fungicides, Difenoconazole (@ 0.1%) recorded the highest pod yield (1757 kg/ha) and test weight (30.75 g) with least disease incidence (17.98%), severity (12.30%), minimum defoliation (4.83%), minimum frequency (1.20/mm2) and reduced size (1.31 mm2) and thereby increased the pod yield by 53.04 per cent and test weight by 21.79 per cent over unsprayed control followed by Propiconazole (@ 0.1%) which recorded pod yield of 1649 kg/ha and test weight of 29.90 g with disease incidence (19.53%), severity (16.58%) and minimum defoliation (5.66%) and thereby increased the pod yield by 49.97 per cent and test weight by 19.57 per cent over unsprayed control. Both the botanicals (Mehandi @10% and NSKE @ 5%) and bioagents (Trichoderma viride, Verticillium lecanii and Bacillus circulans @ 5%) recorded significantly higher pod yield (range, 1089-1333 kg/ha) and test weight (range, 24.39-26.88 g) and increased the pod yield (range, 21.88-38.11%) and test weight (range, 1.39-10.53%) over unsprayed control (yield 825 kg/ha and test weight 24.05 g). The late leaf spot disease incidence and defoliation were found to be reduced with increased number of (two-three) sprayings of the fungicides.

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Issue

Vol. 69 No. 2 (2016): Indian Phytopathology

Section

Research Articles

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How to Cite

A.P. SURYAWANSHI, ANUP DAS and S.P. DAS, U. D. D. D. (2016). Comparative economics of spray scheduling for the management of late leaf spot of groundnut incited by Phaeoisariopsis personata. Indian Phytopathology, 69(2), 149-154. http://epubs.icar.org.in/ejournal/index.php/IPPJ/article/view/58381