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First report of white blister rust disease caused by Albugo occidentalis on spinach in Turkey.

Soylu, S. ; Kara, M. ; Kurt, Ș. ; Uysal, A. ; Shin, H. D. ; Choi, Y. J. ; Soylu, E. M.

Plant Disease 2018 Vol 102 No. 4 pp. 826-827;


In March 2017, detailed field surveys were conducted to investigate the occurrence of leaf diseases in major spinach fields in Hatay Province of Turkey. White blister rust disease was sporadically present in many production fields. The disease incidence on affected crops ranged from 21 to 45% across all the areas surveyed. Initial symptoms were small chlorotic spots on the upper leaf surface. As the disease developed, white pustules (sori) or blisters were frequently produced as irregularly oval, elongated concentric rings, 3 to 4 mm in diameter, mostly on the lower leaf surface but also often on the upper surface. In the advanced stages of the disease, the white pustules often coalesced, and lesions appeared grainy due to the production of numerous oospores, rendering infected leaves unmarketable. Based on morphological characteristics, molecular data (sequence analysis of the rDNA internal transcribed spacer region and cytochrome oxidase II mtDNA) and pathogenicity test, the causal agent was identified as A. occidentalis. The causal agent has been reported as an economically important pathogen of spinach in the USA, Mexico, Greece and Iran. This is thought to be the first report of A. occidentalis in Turkey.