False smut of rice which was considered a minor disease of rice is presently spreading in most of the rice growing areas of the world causing reduction in yield and quality of the produce. West Bengal is the largest producer with largest area under rice in India. No survey on severity of rice false smut disease in West Bengal has been conducted. Therefore, in attempt to get the idea of false smut disease situation in the state, a survey was conducted in 31 blocks from 8 different districts of West Bengal during the year 2017 from the end of October to first week of December. Number of infected tillers per m2 and number of smut balls per panicle was observed during the survey. False smut symptom was observed in all the plains of West Bengal whereas in hilly areas of the state was found to have no incidence of the disease. During the survey average number of infected tillers ranged from 2.00 to 14.60 numbers of infected tillers / m2. Similarly average number of smutted ball / panicle ranged from 1.21 to 5.32 number of spore ball per panicle.
Isolation of ginger (Zingiber officinale) leaf spot pathogen form the UBKV farm field was done in the laboratory. The isolated pathogen was identified as Phyllosticta zingiberi on the basis of morphological characters as documented in taxonomic keys. The microscopic observation revealed that the pycnidia were globose to subglobose with dark brown colour measuring 124.16 μm × 2.35 μm in average. The pycnidio spores were hyaline, oval to bullet shaped, monoguttulate measuring 4.02 μm × 2.35 μm in average. Among the different media tested for growth highest growth was recorded in Oat meal agar (26.44 cm2) followed by malt extract agar (24.04 cm2) which was statistically at par. The temperature of 25˚C favoured maximum growth (24.20 cm2). However, higher sporulation was observed in 30˚C. Among the different carbon source tested, mannitol supported the highest growth of the pathogen (27.67 cm2).
1974 when Jandaik and Kapoor first reported its cultivation on banana pseudo stem chopped with paddy straw. Dikaryotization of selective strains is a very important tool in strain improvement for bringing genetic recombination and developing somatic hybrids which has been used by several workers to develop new strains of Pleurotus with the findings of fast colonizing ability which lead to early flushing of the fruit body with good shape, size, low mortality rate of the bud, good color of the
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