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Relationships of initial population densities of meloidogyne incognita and meloidogyne hapla to yield of tomato



Relationships of initial population densities of meloidogyne incognita and meloidogyne hapla to yield of tomato



Journal of Nematology 8(3): 232-239



Microplots 80 x 100 cm, infested with varying initial population densities (Pi) of M. incognita or M. hapla, were planted to tomato [Lycopersicon esculentum] at 2 locations. Experiments were conducted in a sandy loam soil at Fletcher, North Carolina [USA], (mountains) where the mean temperature for May-Sept. is 20.7.degree. C, and in a loamy sand at Clayton, N.C. (coastal plain) where the mean temperature for May-Sept. is 24.8.degree. C. In these experimentally infested plots, M. incognita and M. hapla caused maximum yield losses of 20-30% at the mountain site with Pi of 0-12,500 eggs and larvae/500 cm3 of soil. In the coastal plain, M. incognita suppressed yields up to 85%, and M. hapla suppressed yields up to 50% in comparison with the non-infested control. A part of the high losses at this site apparently was due to M. incognita predisposing tomato to the early blight fungus [Alternaria solani]. In a 2nd experiment, in which a nematocide was used to obtain a range of Pis (with Pi as high as 25,000/50 cm3 of soil) at Fletcher, losses due to M. incognita were as great as 50%, but similar densities of M. hapla suppressed yields by only 10-25%. Approximate threshold densities for both species ranged 500-1000 larvae and eggs (higher for surviving larvae) for the mountain site; numbers as low as 20 larvae/500 cm3 of soil of either species caused significant damage in the coastal plain. Chemical soil treatments proved useful in obtaining various initial population densities; problems were encountered in measuring effective inoculum after such treatments, especially in the heavier soil.

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Accession: 006303248

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