INTRODUCTORY STUDY ON DISTRIBUTION OF WALNUT ANTHRACNOSE IN IRAN
Plant Pests and Diseases Research Institute, Evin, Tehran, Iran
Background and objectives
Anthracnose is the most serious foliar disease of the black wainut.The causal agent, Marssonina juglandis, attacks fruit and foliage resulting in poor field nuts and premature defoliation . This disease occurs in Iraq, one of our neighbouring countries . My objective was to determine the distribution of this disease in Iran and some of the physical characteristics of the pathogen.
Results and conclusions
The causal agent of walnut anthracnose, Marssonina juglandis was isolated from the leaves of diseased walnut trees by surface-sterilizing with ethanol 96 and its diluted form (1:1 or 1:2), sodium hypochlorite and plating on CMA and MA. Colonies were colourless and radiate usually in form of concentric circles on CMA, dark or pale brown and swollen on MA with the cardinal temperature for growth 25°C (opt.), 30°C (max.), 10°C (min.) and for production of acervuli 15-20°C (opt.), 28°C (max.) and 10°C (min.). The prevalence of this disease during 1996 and 1997 is as follows: The provinces of Tehran (other than Damavand), Qazvin,West and East Azarbayejan, Ardabil, Gilan, Mazandaran, Golestan, Kermanshah, Kordestan and Lorestan are infected and the provinces of Markazi, Esfahan, Hamedan (other than Asadabad), Semnan (other than Kalpoush and its suburbs including Narab and Namnick), Kerman and Fars are not infected.
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