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Assessment of Bacterial Leaf Blight Incidence and Severity in Rice Growing Areas of Pakistan

Assessment of Bacterial Leaf Blight Incidence and Severity in Rice Growing Areas of Pakistan

Rafia Ahsan1, Saif Ullah1, Ijaz Yaseen1, Faisal Sohail Fateh1, Muhammad Fayyaz1, Shahzad Asad1, Atif Jamal1, Muhammad Sufyan2 and Muhammad Zakria1*

1Crop Diseases Research Institute, National Agricultural Research Center, Islamabad, Pakistan; 2Crop Diseases Research Institute, Sunny Bank, Murree, Pakistan.

 
*Correspondence | Muhammad Zakria, Crop Diseases Research Institute, National Agricultural Research Center, Islamabad, Pakistan; Email: rmzakria@hotmail.com 

ABSTRACT

Bacterial Leaf Blight (BLB) is a serious disease of irrigated rice in Pakistan. All famous varieties of Basmati rice are susceptible to bacterial blight. Survey of rice growing areas of Punjab, Sindh and Khyber Pakhtunkhwa (KP) was conducted during the year 2019-20. BLB was prevalent in all the surveyed provinces of Pakistan. In Punjab, high disease prevalence was observed in Gujranwala (55%), Hafizabad (36%), Sialkot (29%) and Narowal (27%). No disease was observed in Wazirabad, Zafar Wal and Gujrat. The disease incidence in Gujranwala, Sialkot and Narowal was 35%, 50% and 21% respectively, and severity ranged from 0-80%, 0-70% and 0-70% respectively. In KP 3 rice growing areas were surveyed. In Mansehra the disease incidence (37%) and severity (0-70%) was lower compared to Swat and lower Dir. In comparison to Punjab and KP, BLB was less prevalent in Sindh. Highest disease prevalence was recorded in Badin (13%) followed by 10% in Shikarpur. In total, forty seven diseased leaf samples were collected from the entire surveyed locations. Thirty isolates were confirmed as Xanthomonas oryzae pv. oryzae (Xoo) through PCR and pathogenicity on susceptible host. The results indicate that BLB is continuously present in rice growing areas of Pakistan specially in Basmati area of Punjab for last many years. There is need to introduce resistant Basmati varieties to reduce the inoculum level and yield losses.

 

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Pakistan Journal of Agricultural Research

March

Vol. 35, Iss. 1, Pages 1-258

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