ECOLOGICAL STUDIES ON THE MAIN INSECT PESTS OF SUGAR BEET PLANTS AND THE MOST COMMON PREDATORS AT KAFR EL-SHEIKH REGION | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 2, Volume 29, Issue 2, February 2004, Page 911-923 PDF (1.35 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2004.239509 | ||||
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| Author | ||||
| R. M. Y. Helal, | ||||
| Economic Entomology Department, Faculty of Agriculture, Kafr EI- Sheikh, Tanta University. | ||||
| Abstract | ||||
| Field experiments were conducted at K'lfr EI-Sheikh Governorate during two successive seasons (1999/2000) and (2000/20()1). Sugar beet was planted at three planting dates, during the first week of September, October and November, respectively. In each plantation, the relative .ibundance of Spodoplera littoralis (Boisd.), Pegomyia mixta (ViII.), Cassida vtttete (ViII.) and three common predators Paederus a/fierii (Stef.), Coccinel/a spp. and Chry .. ;operla camea (Steph.) populations were estimated. The seasonal abundance of either tested insect pest or predator was significantly varied among tested planting dates Statistical analysis indicated that there are significantly positive correlation coefficmnts between the predators density and the main insect pests in the three planting dates. It was found out that September was the most suitable planting date in the tested area, to avoid high insect infestation at Kafr EI-Sheikh Governorate is at early Septernbe.. Results also indicated a negative correlation between the weight of sugar beet root and sucrose percentage with regard of the artificial infestation of Pegomyia mixta. | ||||
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