Effect of Split and Amount Application of Nitrogen Fertilizer to Sugarbeet on Root-Knot Nematode, Meloidogyne Javanica and Crop Production under Sprinkler Irrigation in Sandy Soil

• Nagdy F. Abdel-Baky 1, A. M. Abou El-Naga 1, M. E. El-Nagar 2 And G. A. M. Heikal 2
• (1)Economic Entomology Department, Fac. Agric., Mansoura University, Egypt.
• (2)Plant protection Institute, Dokki, Giza, Egypt.
  Email: nafabdel@mans.edu.eg
• The Third International Conference onIPM Role in Integrated Crop management and Impacts on Environment and Agricultural Products. 26-29 November 2005, Giza, Egypt.

Abstract

Bemisia argentifolii is a polyphagous insect, and its host selection based on the internal biochemicals of the plant leaf sap. therefore, this study was designed to correlate between number of the insect eggs and nymphs and certain biochemicals constituents of soybean and mung-bean leaves. leaf pigments, that including chlorophyll "a" and "b" and carotenes, affected greatly on the insect selection of the oviposition sites in both hosts. as well as, the leaf pigments had a role in settlement of 1st instar nymphs (crawler). amino acids is important for insect development and eggs load of the females. meanwhile, phenolics played a negative role in host selections. increasing phenolocs amount in the plant leaves led to decrease a plant as a host. plant humidityy also influence the host selection. but in case of Bemisia argentifolii , since the eggs and nymphs in physiological contact with plant leaf, the role of humidity in host selection may be low.