Hamdollah-Zadeh A. 1993

• Authors: Hamdollah-Zadeh A.
• Title: Properties of defoliant and non-defoliant strains of Verticillium dahliae the causal agent of cotton wilt in northern Iran.
• Location: Iranian Journal of Plant Pathology 29 (3-4) 53-54 (1993)
• Abstract: Based on morphological and physiological characteristic and host range studies, defoliant and non-defoliant strains of Verticillium dahliae, were identified in the Gorgan area, north of Iran. The mean diameter of microsclerotia of defoliant and non-defoliant strains were 22 times 35 and 32 times 55 micrometers, respectively. In vitro, optimum temperature for mycelial growth was 27 degree C for defoliant strain and 23 degree C for non-defoliant strain. On cotton cultivars Cooker 100W, Acala SJ4-42, Acala SJ5 and on snapdragon and safflower cv. Gila, defoliant strain caused more severe symptoms than non-defoliant strain. On tomato cv. Pearson, non-defoliant strain caused wilting, while defoliant strain did not produce any symptom. The results indicated that defoliant and non defoliant strains are similar to T-1 and SS4 strains, respectively, reported from USA and elsewhere.