International Journal of Plant Protection

I. Yesu Raja ¹, P. Mahalakshmi ²

Affiliations
1 Department of Plant Pathology, Agricultural College and Research Institute, Madhurai T.N.
2 Department of Plant Pathology, Agricultural College and Research Institute, Madhurai T.N., IN

Abstract

In the field trial conducted during Kharif season, spraying at booting stage (85DAS) and 15 days later with carbendazim (500 g/ha) + phosphamidon (1 lit./ha) was the most effective in reducing sheath rot disease incidence, besides giving the maximum yield. Among the plant products and antagonists, neem oil (3%) spray had the maximum efficacy in reducing the disease incidence followed by neem seed kernel extract (5%), Pseudomonas fluorescens (1 kg/ha), Bacillus subtilis (1 kg/ha), leaf extracts (10%) of Acalypha indica , Convolvulus arvensis and in the Rabi season experiment also, the same trend was observed. The maximum cost benefit ratio was recorded in P. fluorescens sprayed plots.

Keywords

Rice Sheath Rot, Integrated Management, Sarocladium Oryzae

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N. Kalieswari ¹, I. Yesu Raja ¹, M. Devi ¹

Affiliations
1 Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN

Abstract

A Leaf spot disease was caused by Alternaria alternata ten isolates were collected from the ashwagandha growing different regions of Tamil Nadu. The virulence of the isolates were tested based on the Per cent Disease Index (PDI) and symptom expressed on the foliar surface. The maximum disease intensity of 65.13 PDI was recorded in Chempatti (I₆) isolate. The minimum disease intensity was recorded in I₁₀ from Cumbum (36.83 PDI). Seven fungicides viz., carbendazim(0.05%), mancozeb (0.2%) copper oxy chloride (1%), chlorothalanil (0.2%), fosetyl (0.1%), Ridomil MZ (0.05%) and dithane M 45(0.05%) were tested against A. alternata. Among the fungicides, the minimum diameter of mycelial growth of A. alternata (0.75cm) and maximum percentage of inhibition (91.34%) were recorded in mancozeb (0.2%).

Keywords

Per Cent Disease Index (PDI), Fungicides, Alternaria alternata, Leaf Spot, Ashwagandha.

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