Author: R.A. BAKR, M.E. MAHDY AND E.M. MOUSA
Volume: 29 Issue: 2
A survey was carried out to know the frequency of occurrence of both root knot nematodes Meloidogyne spp., and citrus nematode Tylenchulus semipenetrans (Cobb, 1913) in the new reclaimed lands in three different governorates in Egypt viz., Behira (El-Tahrir), Minufiya (El-Sadat) and Sharkiya (El-Salhiya) regions as they represent different soil types, crops and climatic conditions. A total of 54 composite soil samples were collected from fields growing different vegetable crops i.e., tomato, potato, eggplant and pepper as well as citrus. Nematodes were extracted and their population density (P.D) and percentage of occurrence were calculated. Results revealed that percentage of occurrence of Meloidogyne spp., was 96.26 % in the surveyed fields, while T. semipenetrans was 85.18 %. Population densities of Meloidogyne spp., greatly differed at all examined locations. The highest P.D was found in El-Tahrir, followed by El-Salhiya regions, whereas El-Sadat region was the lowest one with the values 242, 158, and 114 J2 / 250 g soil, respectively. The highest population densities of T. semipenetrans was found in El-Salhiya, followed by El-Tahrir, whereas El-Sadat region was the lowest by 2881, 1661 and 512 J2 / 250 g soil, respectively. Our survey indicates
that Meloidogyne spp., and T. semipenetrans were widely spread in all examined locations in the new reclaimed lands in Egypt and nematode management strategies must become a part of production practices planning program.