Spatial analysis of potato black scurf disease distribution using GIS and variability of Rhizoctonia solani isolates in Central Karakoram National Park Gilgit-Baltistan, Pakistan

Abstract

Spatial analysis of black scurf distribution and morphological variability were carried out during the year 2012-13 using geographical information system and geostatistics techniques in four valleys & twenty four villages of CKNP region. During the studied it is showed that among the twenty four village eight villages found > 60 % disease prevalence, thirteen in range of 40 – 60 % and three villages 15 %, thirteen villages 10-15 % and three villages 5, thirteen 35 and seven villages in 20 mm-day-1). Effects of different temperature and pH levels on CGR of the isolates were assessed. All isolates attained (above 80 mm CGR) at 30 oC, (70-80 mm CGR) at 25°C and Optimum pH for CGR of isolate were 6.5-7.5 while cluster analysis of twenty isolates were categorized into two main groups i.e. A and B. 70 % of the isolates were classified in cluster A while 30 % in B.