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 |
Global positioning system survey map is an indicator to locate the nature of disease spread so as to conclude the hotspot areas. Yellow mosaic disease on greengram caused by begomovirus genus of the family geminiviridae. Present investigations on field survey for disease incidence, diagnostic symptoms and its spatial distribution in major greengram growing parts of North Eastern Karnataka through Global positioning system (GPS) system during kharif 2015, revealed that the disease was found to occur at all the stages of under field condition and cause 100 per cent yield loss when it infects at seedling stage. Global positioning system based survey indicated that the per cent disease incidence varied from location to location (spatial variation). The highest average incidence was recorded in Koppal (76.70%) followed by Bidar (70.48%), Yadgir (66.70%), Kalburgi (54.15%) and Raichur (51.49%) districts. In Koppal district, Yelburga taluk has shown the highest (78.40%) disease incidence followed by Kustagi (75.00%). While, in Bidar and Yadgir districts, Humanabad and Yadgir taluks have recorded maximum incidence of 70.16 per cent and 64.80 per cent, respectively. The crop infected at early stages suffered more severe symptoms with almost all the leaves exhibiting yellow mosaic, complete yellowing and puckering with severe stunting of plants. Invariably, whiteflies were found feeding in most of the fields surveyed.
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