author(s)
Shahid Hussain, Muhammad Ayub, Muhammad Rasheed, Shabir Hussain, Khadim Hussain, Sajjad Hussain, Syed Imran Hussain, Mehdi Hassan, Ashiq Hussain, Tajamul Hussain, Muhammad Imtiyaz, Hassnain Alam, Muhammad Sajjad, Muhammad Kazim, Saqib Hussain and Muhammad Riaz

abstract
Leaf blight disease of peas caused by Alternaria alternata and Alternaria tusi which is one of the major and important foliage diseases of peas. Leaf blight of peas was first reported occasionally in visconsin a commercial production fields in 1968 and 1976 but recently it has been seen in all peas growing areas of skardu and Kharmang olding. The losses occurs 20- 80% due to the attack of this disease depending upon the management practices. Alternaria tusi was fist reported from kwardu in 2018 at Tusi scientific research center kwardu. Keeping in view the losses caused by Alternaria alternata and Alternaria tusiin peas. The present study was carried out at Tusi scientificresearch center kwardu during the year 2018. The key objectives of this study were (a) Survey and sampling of leaf blight disease of peas in the surrounding of District Kharmang and different localities of Skardu (b) Isolation and identification of the leaf blight disease causing agent, (c) evaluation of in-vitro chemical control measures against the Alternaria sp. causing leaf blight of peas. The fungicides were tested at (50, 100, 200 ppm) concentrations whereas, All treatments were tested with three replications. The result of this study showed that the leaf blight disease of peas occurs in all fields with different intensities during the surveyed area. The maximum disease incidence (22%) was recorded at Muntazir abad followed by Bindiaq (18%) Maqpon abad (17%) whereas, the minimum disease incidence (11%) and 12% was recorded at Gulshan abad and hasnain abad respectively. Different fungi such as Alternaria alternata, Alternaria tusi Aspergillus sp and Penicillium sp with different number of colony frequencies (%) were being isolated from the leaves of leaf blight disease samples. The fungus Alternaria alternata and Alternaria tusi was isolated with maximum (88%) from muntazir abad followed by maqpon abad. Among all the tested fungicides the minimum colony mycelial growth 22.33mm and 32.33mm was recorded when Nativo fungicide used at highest doses 200 and 100 ppm whereas, at lowest dose 50 ppm, the growth of the tested fungus was recorded 39.33 mm. The Cabriotop resulted 33.66mm, 42.66mm and 52.00mm at 200, 100 and 50ppm doses respectively. The Topsin-M and Topas Fungicides did not proved better as compare to Nativo and Cabriotop fungicides. The overall results showed that all tested fungicites retarded the colony mycelail growth of the Alternaria tusi as compare to control.