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Citrus tristeza disease is the most devastating viral disease of citrus plants worldwide. It has been emerging as a serious threat
to citrus production in Pakistan. Since the first report of CTD in 1988, the disease has been widely distributed in country by
now resulting one of the major causes in citrus decline. In this study, the spatial distribution of citrus growing areas, Citrus
tristeza virus occurrence as well as the effect of environmental factors; temperature and precipitation, has been mapped using
geographic information system. Based on the available CTV data from 1992-2013 in Pakistan, subsequent charts were plotted
overlaying spatial data of CTV with respect to annual average temperature, record high/low and annual average precipitation.
The maximum disease incidence was observed in Sargodha district on an average 67% and minimum of 39% in Mardan. The
temperature and precipitation could have been factors driving transmission of CTV locally. The impact of temperature,
precipitation and its corresponding CTV incidence in respective year showed a negative relationship of annual average
temperature with CTV frequency. However, a positive relationship of precipitation with CTV incidence has been found. The
study would contribute to understand the emergence of CTD in this geographical region and to evaluate its extent and extend.
Saadia Naseem, Sara Mahmood, Zahid Ali. (2016) Occurrence Of Citrus Tristeza Virus In Pakistan: A Gis Based Approach Combining Host Distribution And Disease Reports, , Volume-53, Issue-3.
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