EFFICIENCY OF SOME BIONEMATICIDES AGAINST ROOT-KNOT NEMATODE Meloidogyne incognita ON THREE TOMATO CULTIVARS UNDER GREENHOUSE CONDITIONS

This study was carried out to determine the nematicidal efficiency of sevenbionematicides (Nema end, Nema cont, Nema clean, Nema K, Bio-zeid, Bio-arc and Nemex)compared with one nematicide (Nemacur 10%) on three cultivars of tomato against the root-knotnematode (RKN) Meloidogyne incognita under greenhouse conditions. The screened tomato cultivars(endless summer, supermarmand and jueblle) were significantly different in their response to nematodeinfection. Detectable tolerance to nematode infection was recorded with cultivar Endless summer andJuebelle while the least tolerance was recorded with supermarmand cultivar. Number of galls and eggmasses were significantly decreased in the investigated cultivars treated with Nemacur, and Nema k,Nema cont and Bio-zeid (82.49, 73.97; 68.48, 50.00; 30.74, 33.34; 61.09, 40.62%), respectively inendless summer, (78.90, 69.92; 73.70, 55.75; 68.51, 19.48; 72.31, 43.38%), respectively, insupermarmand and (71.15, 67.19; 61.90, 40.64; 59.38, 40.64; 41.18, 15.63%) respectively, in Juebelle.Fresh and dry weights of shoot had significantly increased with same components, (5.10, 8.77; 3.34,7.21; 2.44, 3.24; 2.69, 4.80%) respectively, in Endless summer and (8.03, 5.09; 6.80, 3.96; 4.54, 3.75;6.02, 2.44%) respectively, in Juebelle compared with untreated plants, while supermarmand was themost susceptible for infection with RKN. Random amplified polymorphic DNA (RAPD) marker usingfour primers detected polymorphism in DNA in percentage ranged between 33.33 – 75% with totalpolymorphism 58.33%. Primer OPC-09 gave the highest polymorphism (75%) while OPB-18 gave thelowest polymorphism (33.33%).