POLYALTHIA LONGIFOLIA A NEW HOST RECORD OF NIGROSPORA SPHAERICA CAUSING LEAF BLIGHT IN PAKISTAN AND EFFICACY DETERMINATION OF VARIOUS FUNGICIDES AGAINST THIS PATHOGEN

Imran Ul. Haq, Muhammad Shoaib, Siddra Ijaz, Siddra Ijaz, Khalid P. Akhtar, Khalid P. Akhtar, Sajid A. Khan, Sajid A. Khan, Nabeeha A. Khan, Nabeeha A. Khan

Abstract


 

Severe leaf and stem necrosis of Polyalthia longifolia (Ulta-Ashoka) was observed in Pakistan during summer 2012. Symptoms on leaves were initiated with drying followed by whole leaf and plant drying. The casual pathogen was identified as Nigrospora sphaerica based on cultural characteristics and conidial morphology. Its pathogenicity was proven on healthy P. longifolia plants. This is the first report of Nigrospora sphaerica causing leaf blight on P. longifolia in Pakistan. Furthermore for the selection of most effective fungicide that can be used for the chemical management of the disease under field conditions three fungicides viz., Antracol (ChlorotHalonil), Halonil (Propineb) and Aerosil (Thiophenate methyl) were evaluated against mycelia growth of Nigrospora sphaerica under controlled conditions . Two concentrations were used for every fungicide as it was 500 and 1000 ppm. It was concluded from the results obtained that Halonil was found to be effective fungicide by reducing the mycelia growth of Nigrospora sphaerica by 78.4%. followed by Antracol and Aerosol respectively.


Keywords


Nigrospora sphaerica, Ulta-Ashoka, ornamental plant, first disease report and fungicides

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References


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