MANAGEMENT OF SEED BORNE DISEASES OF RICE
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Date
2012
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Punjab Agricultural University, Ludhiana
Abstract
The rice crop is prone to several diseases such as bacterial blight (Xanthomonas oryzae pv. oryzae), Brown leaf spot (Drechslera oryzae Drechsler), Foot rot (Fusarium moniliforme Sheldon) and Blast (Pyricularia oryzae Cavara). These diseases have become an important constraint in rice production in Punjab during recent years. In vitro and under glass house conditions it was found that Emisan - 6 + Streptocycline and Nativo 75 WG + Streptocycline gave higher germination, minimum microflora and less disease severity among all the chemicals tested. Out of six chemicals evaluated under in vitro conditions for their efficacy against X. oryzae pv. oryzae, D. oryzae, F. moniliforme, P. oryzae and R. Solani. It was found that Streptocycline and Emisan-6 were the most effective against X. oryzae pv. oryzae, Emisan -6 and Nativo 75 WG against D. oryzae and P. oryzae, Nativo 75 WG and Bavistin 50 WP against F. moniliforme and Emisan - 6 and Bavistin 50 WP against R. solani. In field conditions seed treatment with Emisan-6 + Streptocycline, Nativo 75 WG + Streptocycline and Bavistin 50 WP + Streptocycline were the most effective against all seed borne disease of rice which also gave higher grain yield among all the chemicals tested. Amistar 25 SC acts as a growth promoter which results in more root- shoot length, dry and fresh weight and more number of tillers per plant than all the chemicals tested.
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