D. K. Saha ¹, Sitansu Pan ¹

Affiliations
1 Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya Mohanpur, Nadia 741 252, West Bengal, IN

Abstract

Ability of Gliocladium virens Miller, Giddens and Foster to colonise groundnut stem pieces used as organic bait in soil was studied under varying conditions like inoculum density, soil pH, soil moisture and temperature. High temperature (40°C) was lethal for the saprophytic activities of the antagonist as colonisation of the bait was completely inhibited. In air dry soil (ca. 6.0% mhc) colonisation of bait was low (ca. 5.0 - 8.0 %) particularly at lower temperature (20°C) and low level of inoculum (20 mg/100 g soil). Acid soil (pH 5.6) at 50% soil moisture and 30°C temperature gave maximum colonisation of bait. Per cent colonisation of bait was less at either side of this temperature moisture optima.

Keywords

Antagonist, Competitive Colonisation, Gliocladium virens, Inoculum, Organic Bait.

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D. K. Saha ¹, Sitansu Pan ¹

Affiliations
1 Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal 741252, IN

Abstract

Phialospores of four isolates of Gliocladium virens viz., 15GV₁, 26GV₁, 1AGV₂ and IAGV₆ responded differentially to soil fungistasis in different soils of West Bengal according to the properties of soils explored. The pH of soil appeared to be the cardinal factor. The effect of soil fungistasis was more pronounced in alkaline soil followed by neutral soil but gradually decreased due to reduction of soil pH to acidic level. Fungistasis was more in unsterilized soil compared to sterilised one.

Keywords

Gliocladium virens, Phialospore, Fungistasis, Soil pH, Soil Type.

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D. K. Saha ¹, Sitansu Pan ¹

Affiliations
1 Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, Pin-741 252, IN

Abstract

Formulation and application methods are often of paramount importance in biological control (Papavizas and Lumsden, 1980; Papavizas and Lewis, 1983; Papavizas et al .. 1984). Accordingly several techniques viz, antagonist in liquid (Kerr, 1980), organic matter (Wells et al., 1972), as seed treatment (Harmen et al., 1980; Windel, 1981; Fravel et al., 1985) and in vermiculite or in clay such as pyrax (Fravel et al., 1983) have been tested.

Keywords

Gliocladium virens, Formulation, Sodium Alginate Prill, Shelf Life.

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