A review on comparative effect of chemicals and botanicals in management of brown spot diseases of rice (Oryza sativa L.)
https://doi.org/10.26832/24566632.2022.0701018
Abstract
Brown spot of rice is a fungal disease caused by either Bipolaris oryzae, Helminthosporium oryzae or Drechslera oryzae species, which is found to be a major problem eventually causing sustainable losses both in quality and quantity. The pathogen after infection shows the symptoms on the leaves, panicles, glumes, and grain causing first as small, circular, and dark brown to purple-brown spots and fully developed lesions are circular to oval with a light brown to gray center, surrounded by a reddish-brown margin and ultimately killing the leaf. We have collected our information from secondary sources. In this review article, we have discussed the effects of bio-agents and chemicals and their comparative efficacy. Fungicides like: propiconazole, Carbendazim, Mancozeb, Hexaconazole, Cabendazim, Bion, Amistar, Tilt etc. are discussed which showed diverse performance on the diseases brown spot of rice. Extracts from the plant parts like roots, stem, leaves etc. are comparatively analyzed and studied that effected on mycelial growth and spore germination of Bipolaris pathogen. The plant components with phenolic structures like carvacrol, eugenol, and thymol are found to be highly active against the pathogen. The extracts of plants like Azadirachta indica, Nerium oleander, Curcuma longa, S. indicum, Cymbopogon citratus etc. are found suitable against brown spot in rice. Chemical fungicides were found to have more inhibition rate against the pathogen, even up to 100%. Although being eco-friendly, plant extracts were recorded to be less effective in comparison to chemical fungicides for suppressing plant pathogen. This article promotes the use of plant extracts for human health and environmental benefits over the use of chemicals for the control of plant diseases.
Keywords:
Bipolaris oryzae, Botanicals, Brown spots, Chemical fungicidesDownloads
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