ADVANCED STUDIES ON BARLEY POWDERY MILDEW DISEASE IN EGYPT
MAMDOUHA MAHMOUD HUSSIEN HAMMOUDA;
Abstract
Barley (Ho deum spp. L.) is an important small-grain cereal in
Egypt used for human and animal feeding. The main cultivated area was
142,600 feddans under irrigation and about 300,000 feddans under rainfall conditions during 1998.
Barley is liable to infection of many diseases in Egypt. Powdery mildew caused by Erysiphe graminis f sp. hordei. is one of the most destructive diseases either to foliage or grain yield.
Greenhouse experiments and field trials were conducted to find out effective control measures against powdery mildew.
The obtained results could be summarized as follows:
1. During three seasons (1992-1995) ninety nine isolates of Erysiphe graminis f sp. hordei , were classified into fifteen physiologic races based on reactions of six differential barley varieties.
2. Race No. 13 was identified for the first time in Egypt, while the other races were previously identified in Egypt and in other countries.
3. Seasonal distribution of the identified races was partially
different from 1992 to 1995 since only two races;No.land 23, were predominant in Egypt.
4. Race 23 was found to be the most complex one, showing susceptible reaction on the six differentials used.
5. Forty six pathotypes of powdery mildew were identified when the obtained 99 isolates have been inoculated on 17 Pallas near-isogenic lines of barley.
Egypt used for human and animal feeding. The main cultivated area was
142,600 feddans under irrigation and about 300,000 feddans under rainfall conditions during 1998.
Barley is liable to infection of many diseases in Egypt. Powdery mildew caused by Erysiphe graminis f sp. hordei. is one of the most destructive diseases either to foliage or grain yield.
Greenhouse experiments and field trials were conducted to find out effective control measures against powdery mildew.
The obtained results could be summarized as follows:
1. During three seasons (1992-1995) ninety nine isolates of Erysiphe graminis f sp. hordei , were classified into fifteen physiologic races based on reactions of six differential barley varieties.
2. Race No. 13 was identified for the first time in Egypt, while the other races were previously identified in Egypt and in other countries.
3. Seasonal distribution of the identified races was partially
different from 1992 to 1995 since only two races;No.land 23, were predominant in Egypt.
4. Race 23 was found to be the most complex one, showing susceptible reaction on the six differentials used.
5. Forty six pathotypes of powdery mildew were identified when the obtained 99 isolates have been inoculated on 17 Pallas near-isogenic lines of barley.
Other data
| Title | ADVANCED STUDIES ON BARLEY POWDERY MILDEW DISEASE IN EGYPT | Other Titles | دراسات متقدمة على مرض البياض الدقيقى على الشعير فى مصر | Authors | MAMDOUHA MAHMOUD HUSSIEN HAMMOUDA | Issue Date | 1999 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B10092.pdf | 401.19 kB | Adobe PDF | View/Open |
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