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Tomato is host for several viruses and attacked by tobacco mosaic virus (TMV), tobacco streak virus (TSV), tomato leaf curl virus (TLCV), tomato chlorosis virus (ToCV) and cucumber mosaic virus (CMV) etc.
Among the viral diseases, tomato leaf curl virus (TLCV) has emerged as the most important disease (Chakraborty, 2008) and belongs to the Geminiviridae family that has a circular, single-stranded DNA genome virus with two incomplete icosahedral geminate particles (Pandey et al., 2009).
The environmental conditions conducive for TLCV disease development were characterized on five tomato varieties i.e., Big Beef, Caldera, Sitara-TS-101, 014276 and Salma.
The relationship of TLCV disease incidence was very poor with rainfall and wind velocity (Fig.
Relative humidity had significantly negative influence on TLCV disease incidence and linear regression model explained 78 to 87% variability in disease development as the relative humidity increased, the disease incidence was decreased (Fig.
Five susceptible and highly susceptible cultivars were sown for accurate characterization of favorable environmental variables with TLCV disease development because these categories (susceptible and highly susceptible) are more predisposed to disease as compared to other categories (resistant, moderately resistant and moderately susceptible).
Among the devastating pathogens, tomato leaf curl virus (TLCV) is an important and major constraint in reducing the yield of tomato crop (Singh, 2014).
TLCV is a group of viruses which belongs to the Geminiviridae family that contains plant viruses with a circular, single-stranded DNA genome and two incomplete icosahedral geminate particles (Pandey et al., 2009).
TLCV causes tomato leaf curl virus disease (TLCVD), the most widespread among viral diseases and found in several Middle Eastern, African, Asian and Mediterranean countries (Abhary et al., 2007).
TLCV is transmitted by whitefly, Bemisia tabaci (Genn.) in a circulative and persistent manner which belongs to order Hemiptera and family Aleyrodidae (Boykin et al., 2007).
Varietal resistance is the best option for the TLCV disease management.
(ii) Pathogenecity test through grafting: Twenty seven varieties/lines were planted in earthen pots placed in green house for the confirmation of TLCV by graft inoculation.
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