Biology and pathogenicity of cereal cyst nematodes on wheat in Ismailia, Egypt
Abstract
A survey on cereal cyst nematodes (CCN) was carried out in wheat production areas in Ismailia province, Egypt. CCN were found in five out of seven regions in Ismailia. The highest incidence of CCN was found at El Shark location (West Sinai). All Egyptian populations were identified as Heterodera avenae based on morphometrics of cyst vulval cones and second stage juveniles. The Egyptian populations of H. avenae were related to H. avenae populations belonging to Type B based on ITS-RFLP patterns generated by restriction enzymes while a German population (Grafenreuth) of H. avenae was found related to Type A. Analyses of ITS region sequences confirmed the species identification of the Egyptian populations. They were clustered with H. avenae populations from Iran, Saudi Arabia, India and China. The hatching pattern of the Egyptian populations of H. avenae was similar to the Mediterranean ecotype with winter activity while the German population was similar to the Northern ecotype with spring activity. The reduction in grain yield of the Egyptian wheat cultivars by H. avenae ranged between 15 - 42% under greenhouse conditions. The Egyptian populations of H. avenae have the same virulence as pathotype Ha13 while the German population could be assigned to pathotype Ha11. The Egyptian wheat cultivar 'Sakha 93' could be classified as tolerant to H. avenae populations under greenhouse conditions. Control strategies such as early planting and rotation that are effective against the Mediterranean ecotype of H. avenae in several countries should be developed against the Egyptian populations of H. avenae.
Downloads
Published
Issue
Section
License
Once a dissertation has been published, the copyright remains at the author. Herby, the author remains the right to further distribute and exploit the work.
License
The dissertations of the book series "Dissertationen aus dem Julius Kühn-Institut" are licensed under a Creative Commons Attribution 4.0 International license.
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material for any purpose, even commercially
Under the following terms:
-
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.