National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Ber (Zizyphus mauritiana Lamk) is one of the important fruit crops of arid and semi arid zones of the world. In India though it is a minor fruit but recently the ber become an important cash crop in some areas and its acreage and production are increased. Due to rapid spread of commercial cultivation, the crop is also affected by different biotic and abiotic factors including pathogens causing many serious diseases. Among the diseases, Alternaria alternata is one of the most important, widespread and easily recognized disease. The disease is characterized by the formation of small, irregular brown spots on upper surface of leaves. Corresponding lower side appears with dark brown to black spot 3 to 6 mm in diameter with a gray to tan centre and distinct brownish yellow margins. Under humid conditions, black patches comprising plenty of conidia can be seen and which severe as air borne inoculation. As in case of ber plants, under severe conditions many spots coalesce to form big patches and later such leaves defoliated from branches. In varietal screening, forty varieties/germplasm was screened against Alternaria alternata (Fr.) Keissler. It was recorded that none of the variety was found free from disease and only 3 germplasm, Narendra ber Selection-1 (3.50%) Seo (4.0%) and Narendra ber Selection-2 (4.60% area covered with the pathogen) were found resistant and 20 genotypes having disease intensity 5.01 to 20% area covered with the pathogen were moderately susceptible, 13 genotypes having disease intensity to 20.01 to 50% area covered with the pathogen were susceptible and 4 genotypes namely genotypes having disease intensity > 50% area covered with the pathogen were found highly susceptible.
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