An experiment was conducted to determine the impact of six aqueous leaf extract;Vinca rosea, Datura stramonium,Tagetes erecta, Aambrosia maritima, Ocimum basilicum, Bougainvillea spectabilisalone or combined with the nematophagous fungus;Paecilomyces lilacinusagainst the root-knot nematode, Meloidogyne javanicaon potato(Solanum tuberosum) cv. Diamant under greenhouse conditions in Egypt. Results indicated that the most treatments tested obviously caused remarkable increase in potato plant growth with different degrees. The combination treatment ofP. lilacinus+D. stramoniumtogether revealed the highest value of percentage increase of the whole plant fresh weight (78.1 %), while the treatment ofO. basilicumalone gave the lowest value of percentage increase of the whole plant fresh weight  (23.8 %) . In addition,   treatments singly or combined increased  fresh weight and length of the whole plants as well as weight of potato tubers.

The combination ofP. lilacinus+D. stramoniumshowed the highest efficacy in reducing the nematode population in both soil and roots also.  On the other hand; the treatment ofP.lilacinusalonel showed the least effect. The combing effect ofP. lilacinus+D. stramoniuminduced a remarkable reduction in the nematode build up and improved both plant growth and tuber weight of potato plants in relation to nematode  alone.