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VOL. 6, ISSUE 6 (2021)
Qualitative aeromycological study of the rice agroecosystem
Authors
S Sudhasha, P Balabaskar
Abstract
Rice crop is affected by many foliar diseases by fungal pathogens such as Blast, Brown spot, Narrow brown spot etc. might be polycyclic pathogens which are mainly spread and impacts all-around times of rice cultivation. Considering their impact on significant yield loss every year, a one-year (2020) aerobiological study was carried out in Thiruthani (13°11′N 79°38′E) at Thiruvallur District in two seasons Kharif (April to July 20/2019) and Rabi (August – December 23/2019). The aerobiological study conducted from January 2019 to December 2019 observed a total of 2414×103 fungal colonies of 20 different species and some unidentified species. Of these, 812×103 fungal colonies were observed during the Kharif season, 1283×103 fungal colonies were observed during the Rabi season, and only 319×103 fungal colonies were observed during barren land conditions (January 2019–March 2019). Most of the airborne pathogens reached 100% percentage frequency excluding Penicillium spp. (91.4%), Rhizopus spp (83.3%), Pythium spp (75%), Erysiphe spp (66.6%), Puccinia spp (83.3%), Sclerospora spp (58.3%), Ustilaginoidea spp (75%) and Albugo spp (75%) were not present all over the months. Airspora Bipolaris oryzae percentage contribution was higher than all other organisms (20.7%) followed by Curvularia spp. (12.24%), Alternaria spp. (11.13%), and Trichoderma spp. (10.65%) are considered as Highly Potential microbes (Percent contribution >10%). Alternaria, Bipolaris, Curvularia, Fusarium, and Trichoderma spp were present all over the year as Potential microbes (Percent contribution 5 – 10 %). Cylindrocladium, Cercospora, and Colletetrichum spp (Percent contribution 2 - 5 %) were present all over the year but as Moderately Potential microbes, while, Aspergillus and Pyricularia spp (Percent contribution 1-2%) categarized as Less Potential pathogens. Mucor, Rhizopus, Pythium, Erysiphe, Puccinia, Sclerospora, Ustilaginoidea, Chaetomium, Albugo and unidentified microbes (Percent contribution <1%) were at Low Potential condition. Among different classes of fungi, Ascomycetes occupied first position with 93.92 airspora percent contribution while other classes contributed below 2%.
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Pages:1009-1013
How to cite this article:
S Sudhasha, P Balabaskar "Qualitative aeromycological study of the rice agroecosystem ". International Journal of Botany Studies, Vol 6, Issue 6, 2021, Pages 1009-1013
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