Effects ofMeloidogyne incognitaandFusarium oxysporumf. sp.vasinfectumon Plant Mortality and Yield of Cotton

At initial populations of Fusarium of 2.3-4.2×10 3 colony-forming units per gram of soil and initial populations of Meloidogyne of 10-50 eggs and juveniles per 100 cm 3 , a significant Fusarium×nematode interaction was observed. No interaction was observed at lower nematode populations or at higher populations of Fusarium. Populations of Meloidogyne had significant effects on cotton growth measured qualitatively as a growth index; the growth index was increased by low initial nematode populations and reduced by high initial nematode populations