الفهرس | Only 14 pages are availabe for public view |
Abstract These experiments were carried out under field conditions at Elnubaria Province and at the laboratories of The City of Scientific Research and Technology Applications, Alexandria, Egypt to recognize plant parasitic nematodes infecting sugar beet plants and to evaluate two antagonistic microbe formulations and two plant extracts in the management of root knot nematode, Meloidogyne incognita infecting sugar beet, Beta vulgaris L cv. DS 9002. The tested biocontrol agents were : Serratia marcescens , Trichoderma harzianum , Nemastop and neem oil. Furthermore greenhouse experiments were done to evaluate the effect of the infection of sugar beet plants with root knot nematode , M. incognita on the concentration of plant enzymes. The results indicated that the biocontrol agent of the fungus , T. harzianum gave the highest increases in the vegetative characters of sugarbeet plants i.e. root diameter, root scale, root length, total weight root, total foliage weight, and total weight plant. Moreover, results indicated that the bacterium biocide, Serratia marcescens gave the highest reduction percentages of root gall numbers and egg mass numbers, followed by the fungus biocide, T. harzianum , and neem oil extract. All treatments significantly increased the total soluble solids and the total sugar content of roots. Treatments increased the protein content of sugar beet roots except the treatment of Nemastop which decreased the protein content, while in leaves all treatments significantly increased the protein content. As for the Effect of root knot nematode, Meloidogyne incognita, infection to sugar-beet (Beta vulgaris L.) cvs. Tenor and DS9001 on the concentrations of Catalase , Peroxidase , Poly phenyloxidase , Polyalanine aminolyase (PAL) enzymes in leaves and roots of plants after 5 and 10 days of inoculation, results indicated that Catalase , Peroxidase enzymes were significantly increased at the leaves and roots of infested plants after 10 days of nematode inoculation with some exceptions. poly phenyloxidase was greatly increased at the leaves of both varieties after 5 and 10 days of nematode inoculation while it was decreased at roots of Tenor variety. Polyalanine aminolyase (PAL) was significantly increased at roots and leaves of Tenor variety while the effect was almost negative with DS9001 variety. Key words: Sugar beet, plant parasitic nematodes, Meloidogyne incognita |