Characterization of Spongospora subterranea f. sp. subterranea, the cause of powdery scab of potato in Pakistan
2002
Iftikhar, S. | Fahmeed, F. (National Agricultural Research Centre, Islamabad (Pakistan). Crop Diseases Research Inst.) | Ahmad, I. | Hameed, A.
Powdery scab of potato is caused by Spongospora subterranea f. sp. subterranea. Current study differentiated the powdery scab from deep-pitted scab, which is closely related to common scab (Streptomyces scabies). Pathogen was characterized by light and electron microscopy. Light microscopy (LM) of spores of raised pustules and galls showed a characteristic spongy and honeycomb-like structure. Whereas, spore like bodies of deep-pitted lesions were rounded to oval compact and dark colored bodies. Scanning electron microscopy (SEM) of spore balls of local isolate of S. subterranea revealed no difference in structure on comparison with spore balls of European isolate. Whereas, spore like bodies of deep-pitted scab showed difference in structure. Bioassay and ELISA tests did not show any correlation of spores of powdery and deep-pitted scab.
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