Field experiment was conducted for 2012-13 and 2013-14 during winter season at Research Farm of BCKV, Nadia, West Bengal to study the distribution pattern of leaf blight pathogens on wheat at different phenological Zadok's growth stage (GS) and its interaction with various meteorological factors. The result showed that at seedling stage (GS 15), Alternaria alternata and Alternaria triticina caused maximum infection and continue upto GS49 and Curvularia lunata, other pathogens were noticed upto GS33. Whereas, major pathogen, Bipolaris sorokiniana infestation started at GS15 and gradually increase and reach to its maximum at GS91. The results pertaining to meteorological factors also demonstrated that increase in maximum temperature (Tmax), minimum temperature (Tmin), bright sunsine hours (BSH) and Dew Point morning (DPmor) significantly decreased A. alternata infection. Increase in Tmax, Tmin and DP mor and DP eve reduced A.triticina infestation. Whereas infection of B. sorokiniana increased with increase in Tmax, Tmin, BHS and DPmor although RHmax and RHmin had a negative correlation with its growth. C. lunata and other pathogens showed no significant correlation with these meteorological factors except that RHmin significantly effect on disease progression.
A field investigation was conducted in Coimbatore district of Tamil Nadu in the year 2020 to 2021 in order to identify the fungal plant diseases of some important crops (tomato,brinjal,sugarcane,mango and banana). The diseases were identified based on the development of characteristic disease symptoms on the plant and morphological studies of the associated micro-organisms under the microscope as-Earlyblight of Tomato (Alternaria solani), Septoria leaf spot of Tomato (Septoria lycopersici), Cercospora leaf spot of Brinjal (Cercospora melongenae), Red rot of Sugarcane (Colletotrichum falcatum), Grey blight of Mango ( Pestalotia anacardii), Anthracnose of Mango(Colletotrichum gloeosporioides) and Yellow sigatoka leaf spot of Banana(Cercospora musae).The per cent disease incidence was assessed by recording the number of plants showing disease symptoms and the number of plants examined.Grey Blight of Mango wasfound to have the highest disease incidence in Udumalaipettai block, whereasPollachi (North) recorded highest disease incidence for all other important cropdiseases. It was also observed that Pollachi (North) block had the highest PDI (Per cent Disease Index) values for all diseases when compared to Udumalaipettai block.
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