Showing papers by "Jyoti Kumar Sharma published in 1992"
TL;DR: Generally, susceptibility of a provenance to the threespecies of Cylindrocladium showed significant differences; only a few provenances gave either equally resistant or susceptible reactions to all the three species.
Abstract: Susceptibility of 46 provenances belonging to 16 species of Eucalyptus to Cylindrocladium leaf blight caused by Cylindrocladium quinqueseptatum, C. clavatum and C. ilicicola differed significantly in detached leaf inoculations. Generally, susceptibility of a provenance to the three species of Cylindrocladium showed significant differences; only a few provenances gave either equally resistant or susceptible reactions to all the three species. C. clavatum was the most virulent species, C. ilicicola the least and C. quinqueseptatum intermediate.
9 citations
TL;DR: In both the types of shading high soil moisture regime and high seed rate contributed to high disease severity as well as low shoot:root ratio of seedlings.
Abstract: Nursery practices influenced incidence and severity of diseases of Eucalyptus grandis viz. damping-off caused by Pythium sp., Rhizoctonia solani and Cylindrocladium quinqueseptatum, web might by R. solani, seedling blight by C. quinqueseptatum and shoot wilt by Sclerotium rolfsii. Growth of seedlings of E. grandis and microclimatic conditions were also affected by nursery practices. Shading with coconut leaf thatch led to low light intensity (av. 1463 lux) with high soil water potential, low soil and ambient temperatures, and high severity of damping-off and web blight diseases and poor shoot:root ratio of seedlings. Seed beds under coirmat had dispersed light (av. 22 299 lux), apparently high severity of seedling blight and shoot wilt, and good growth (snoot:root ratio) of seedlings. In both the types of shading high soil moisture regime and high seed rate contributed to high disease severity as well as low shoot:root ratio of seedlings.
7 citations
TL;DR: Of the 11 carbon (C) and 13 nitrogen (N) sources evaluated in liquid media for their differential utilization by the five selected CQ isolates, five each of C and N sources differentiated them from each other.
Abstract: Isolates of Cylindrocladium quinqueseptatum (CQ), which cause leaf blight of Eucalyptus in Kerala, differed significantly in growth and cultural characters on nine different agar media. Malt extract agar and yeast malt agar and yeast malt agar were the best media for discerning differences among the CQ isolates. Of the 11 carbon (C) and 13 nitrogen (N) sources evaluated in liquid media for their differential utilization by the five selected CQ isolates, five each of C and N sources differentiated them from each other. In general, organic N sources supported better growth and micro-sclerotia production over inorganic, and hexose and disaccharide over trisaccharide and polysaccharide.
4 citations