Evaluation of Infestation Degree of Root-Knot Nematode on two Tobacco Varieties (Burley and Flue-Cured) and Surveying of Meloidogne Species in the Syrian Coast

This study was conducted in Tobacco fields in the Syrian coast to investigate Root-knot Nematode on two varieties of tobacco (Burley and Flue-cured). Two hundred and five samples of the roots of infected plants were collected from 32 fields in the period between early August and early October. The results showed that the degree of infestation was high (fifth degree) to Flue-cured tobacco (average was 179.20 knot for one sample), and fourth degree to the Burley tobacco (average 39.95 knot on one sample). There were three species of Meloidogyne: M.javanica, it had the most frequency 46.25 % and 43.7 % of Burley and Flue-cured tobacco respectively, followed by M.incognita 26.25 % and 24.44% of samples respectively. These species were present together in less frequency on both studied varieties. Whereas the third specie M.arenaria only appeared in three sites of Flue-cured tobacco in less frequency (5.18 %) and was associated with M.incognita.

Survey of parasitic and nonparasitic nematodes associated with maize roots at Kharabo (Damascus countryside) and AL-Mraieh (Deir Al-zowr) locations

Field survey was conducted to identify plant nematode genera associated with maize crop during the period August-October 2003. The study was carried out at two locations: Kharabo station (Damascus countryside) and Al-Mraieh station (Deir Al-zowr) in Syria. 36 complex samples were collected from roots and rhizosphere soil; nematodes were extracted by two methods Sieving and Baermann funnel, examined under microscope for identifi cation. Population density and absulute frequency for each genera were calculated. Results of field survey showed the presence of 14 genera of plant parasitic, 4 fungivorous, and 12 omnivorous nematodes in maize roots and rhizosphere soil .

Survey of Verticillium wilt disease on olive trees in Lattakia

Verticillium wilt is one of the most serious disease that affect olive trees, and it is spread all over the world where the olive trees grown. It is caused by the soil – borne fungiVerticilliumdahliaekleb. Whichhas a wide host range, and forms amicroseclerotia that survive for long time in the soil.and it is difficult to manage. In this studya survey was carried out in order to determine the incidence and severity of infection on olive trees in Lattakiaduring2015. The results showed that the highest percentage of infection and severity were on the Kaissicultivar in ALqurdaha (10.68% , 4.05%) respectively , and the lowest percentage of infection and severity were on the Safrawicultivar in ALqurdaha (3.92% , 0.97%) respectively.