Susceptibility assessment of Iranian onion clones to pink root-rot disease
2004
Nasr Esfahani, Mehdi | Ansari-pour, Behrooz | Mortazavi Bak , Ahmad | Noori Moghadam,Rahimeh
At present, pink root-rot disease Pyrenochaeta terrestris is one of the serious disease of onion fields in Iran and the worlds. The use of resistant cultivars might be a good alternative as suggested on the basis of the screening at the near end of growing season. The susceptibility assessment of 43 Iranian onion clones in glass-house condition in Isfahan for the last two continous years i.e. 2003-04 indicated that, the clones react independently with various degrees of resistance to the pink root-rot disease and with a high significant effects. The scoring scale was of 0-3 to determine the susceptibility and/or resistance of the clones to the disease, out of which, the two clones, Ramhormoz-Saffiabad and Balochestan-Sarbaz were the most suscuptible clones into the pink root-rot disease, and were planced in 2-3 (0-3) scale. Whereas, the most of the clones were placed in the scoring scale 1-2 (0-3) indicating, that they are in the ranges oftolorences. This could be a reason, why they are still existing and could tolorate the disease and remain safe yet. The third and/or the resistant clones, are those clones that, were place in the scoring scle of 0-1 (0-3), i.e. N aishabor- Ishaghabad, Sarri- Local, Loosha-Golden, Zanj an-Ghotigheseh, Shahrood-local, Azar1iayej~~East, Shahrood-Lasjerd, Kashan-White, Yazd-Marvdasht, Azarshahr-Red and Boshehr-Local respectively. In fact, the two clones Naishabor-Ishaghabad and Sarri-local are are the most resistance ones to the pink root-rot disease of onion in these tests. These results indicating that, there are certain clones which can be considered in breeding programmes and/or cultivations.
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