MARZOUK, I., EL-BAWAB, A. (1999). EFFECT OF SOWING DATE OF BARLEY ON ITS INFESTATION WITH THE CORN LEAF APHID ,Ropalosiphum maides (Fitch)(Homoptera: Aphididae) AND YIELD COMPONENTS. test, 77(4), 1493-1499. doi: 10.21608/ejar.1999.342096
IBRAHIM A. MARZOUK; AHMED M. O. EL-BAWAB. "EFFECT OF SOWING DATE OF BARLEY ON ITS INFESTATION WITH THE CORN LEAF APHID ,Ropalosiphum maides (Fitch)(Homoptera: Aphididae) AND YIELD COMPONENTS". test, 77, 4, 1999, 1493-1499. doi: 10.21608/ejar.1999.342096
MARZOUK, I., EL-BAWAB, A. (1999). 'EFFECT OF SOWING DATE OF BARLEY ON ITS INFESTATION WITH THE CORN LEAF APHID ,Ropalosiphum maides (Fitch)(Homoptera: Aphididae) AND YIELD COMPONENTS', test, 77(4), pp. 1493-1499. doi: 10.21608/ejar.1999.342096
MARZOUK, I., EL-BAWAB, A. EFFECT OF SOWING DATE OF BARLEY ON ITS INFESTATION WITH THE CORN LEAF APHID ,Ropalosiphum maides (Fitch)(Homoptera: Aphididae) AND YIELD COMPONENTS. test, 1999; 77(4): 1493-1499. doi: 10.21608/ejar.1999.342096

EFFECT OF SOWING DATE OF BARLEY ON ITS INFESTATION WITH THE CORN LEAF APHID ,Ropalosiphum maides (Fitch)(Homoptera: Aphididae) AND YIELD COMPONENTS

Egyptian Journal of Agricultural Research
Article 6, Volume 77, Issue 4, December 1999, Pages 1493-1499    PDF (1.76 M)
Document Type: Original Article
DOI: 10.21608/ejar.1999.342096
Authors
IBRAHIM A. MARZOUK1; AHMED M. O. EL-BAWAB2
1Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
2Field Crops Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
Abstract
Field experiments were conduced at El-Giza Research Station dur­ing the two successive seasons (1995/1997)to determine the effect of sowing date of barley on its infestation with the corn leaf aphid, Ropalos­iphum maides. (Fitch) (Homoptera: Aphididae) and yield components. Testing sowing dates were 23/11, 8/12 and 23/12 in the first season and 26/11, 11/12 and 26/12 in the second one. For both seasons of investigation, aphids colonized barley plants in the early stages of their life in negligible number. The mean total numbers of aphids/tiller in 1995/96 was comparatively low for the three sowing dates(5.52,4.64 and 2.75, respectively) comparted to that for 1996/97 (40.71,23.46 and 13.68, respectively). Peaks of infestation occurred at mean weath­er conditions of 10-11°C and 63-73% R.H.Both biological and grain yield were affected under heavy aphid infestation. The first sowing date showed the highest significant values of biological and straw yield com­pared to the other two tested sowing dates. The highest grain yield was took place at the second sowing date.
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