مقايسه حساسيت ارقام تجاري و همسانه هاي وحشي سيب زميني به بيماري پوسيدگي خشك فوزاريومي

The Fusarium dry rot is one of the most important diseases of potato tubers causing considerable damages during the storage. Resistance sources are one of the fundamental methods in prevention and disease control. This study details the assessment of susceptibility of commercially acceptable potato Cultivars and wild clones (phurejas) to dry rot causing by F.sumbucinum (Syn. F. sulphureum), F.solani and F.oxysporum under similar conditions incilidings. inoculum, method of inoculation, temperature, relative humidity and light. The results indicated that though the similar conditions were applied, the tubers of varieties and wild clones reacted with differing levels of resistance to the species causing the disease, ft was found that F.sumbucinum was the most aggressive one, then fallowed by F.solani as far as the disease development is concerned and were independent. F,oxysporum did not cause considerable damages. In these expriments the commerical potato varieties were Seuminar, Rustica, Clivastave, Dital, Escort, Monalisa, Marfona, Mondial, Aniona, Deraga, Asia, Ilidram, Melisa, Moren, Mariyana, Pashandi, Frasco, Alva, Ceaser, Asva, Aula, Sandara, Marijke, Folva, Tiva, Fregate, Baraka, Aida, Diamant, Arnica, Panda, Atlas, Erigo, Volkano, Famosa, Carlita, Korrigan, Casinos, Assour, Cosima, Ariane, Desiree and Saturna, in which started with most susceptible ones fallowed to resistance ones at end to F. sumbucinum. The variety Saturna was the most resistant one to the all tested species in these expriments. Within the wild clones ( Phurejas) , the clones H2B 125(32) and XBX33(45) were the most resistant ones to F.sumbucinum and the clone H2B 125(32) was the most resistant clone to the F.sumbucinum and F,solani.