Nematropica (1997) 27, 61-67

R. Crozzoli, N. Greco, A. Suarez and D. Rivas (1997)
Patogenicidad del Nematodo Agallador, Meloidogyne incognita, en Cultivares de Phaseolus vulgaris y Vigna unguiculata
[Pathogenicity of the root-knot nematode, Meloidogyne incognita, to cultivars of Phaseolus vulgaris and Vigna unguiculata]
Nematropica 27 (1), 61-67
Abstract: Screenhouse experiments were conducted in 2 000-3 000 cm³ plastic bags to investigate the relationships between a range of population densities (0, 0.25, 0.5, 1, 2, 4, 8, 16, and 32 eggs and second stage juveniles/cm³ soil) of Meloidogyne incognita race 2 and yield of the susceptible cultivars Tenerife, Montalbán and Manuare of Phaseolus vulgaris and Metro of Vigna unguiculata. Results demonstrated that all cultivars were very susceptible to M. incognita. Seinhorst's curves fit the data well, and tolerance limits to M. incognita of 0.02 J2 + egg/cm³ soil for the cvs Tenerife and Montalbán and 0.03 J2 + egg/ cm³ soil for cvs Manuare and Metro were derived. Minimum yields at larger nematode densities were 36.5, 43, 53 and 28%, respectively. Populations of M. incognita increased in soil infested with up to 8 J2 + eggs/cm³ soil, but generally remained at same level at larger initial population densities except for the cv Manuare on which a sharp decline was observed. Nematode reproduction rates were higher the lower the initial densities. Seinhorst's equation for population growth also fit data for initial and final nematode densities, assuming maximum reproduction rates of 20, 16, 36, and 5, equilibrium densities of 25, 12, 28, and 9 J2 + eggs/cm³ soil, and maximum potential nematode populations of 64, 64, 42, and 35 J2 + eggs/cm³ soil for the cvs Tenerife, Montalbán, Manuare and Metro, respectively.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Spanish)
Database assignments for author(s): Renato Crozzoli

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne incognita	Beans (Phaseolus)
	Meloidogyne incognita	Cowpea and relatives (Vigna)