Detection of fungi causing root rot of apple nurseries in Swat [Pakistan]
1995
Jahangir | Ayub, M. | Mohibullah | Khan, M. (Agricultural Research Station, Mingora (Pakistan))
An extensive survey of the apple nurseries growing in Swat Valley was carried out to identify the causal organisms of apple root rot complex. Specimens were collected from the Standard, MM-106 and MM-111 root-stocks. Fungi commonly encountered and identified were Phytophthora cactorum, Phytophthora spp., Rhizoctonia solani, and Sclerotium rolfsii. Frequencies of incidence of these fungi were 66%, 6%, 0% and 23%, respectively on standard root-stock; 60%, 11%, 22% and 7%, respectively on MM-106 root-stock; and 49%, 2%, 31% and 18%, respectively and on MM-111 root-stock. All the tested root-stocks were susceptible except the Standard root-stock which was tolerant to Rizoctonia solani. S. rolfsii was highly virulent than the other fungi when artificially inoculated on excised apple twigs.
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