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Meloidogyne phaseoli n. sp. (Nematoda: Meloidogynidae), a root-knot nematode parasitising bean in Brazil

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For more content, see Nematologica.

Meloidogyne phaseoli n. sp. is described and illustrated from specimens parasitising bean cv. Carioca in Brasilia, Brazil. The perineal pattern of the female is rounded to oval-shaped with a dorsal arch that is flattened to moderately high and squarish, sometimes with rounded shoulders. The striae are moderately spaced and often distinctly forked in the lateral field. The female stylet is 14-19 μm long and has broad, distinctly set-off knobs and several small, rounded projections on the shaft. The excretory pore opens 34-82 μm from the head near the level of metacorpus. Males are 999-2105 μm in length and have a high, wide head cap that slopes posteriorly. The labial disc and medial lips are partially fused to form an elongated lip structure. The robust stylet is 20-26 μm long and has wide knobs that are distinctly set-off from the shaft which is marked by several small, round projections. Mean second-stage juvenile length is 464 μm. The head region is not annulated and the large labial disc and crescent-shaped medial lips are fused to form a dumbbell-shaped head cap. The stylet is 10.5-12 μm long and has rounded, posteriorly sloping knobs. The slender tail, 46-64 μm long, has large irregular-sized annules in the posterior region and a slightly rounded tip. The hyaline tail terminus is long, 10.5-19.3 μm. The esterase isozyme is a unique E3 phenotype having one weak and two strong bands. Tomato, tobacco, bean and pea are good hosts, corn is a very poor host, whilst pepper, watermelon, peanut, cotton and soybean are non-hosts.

Affiliations: 1: EMBRAPA/CNPH – BR 060 Km 09 Caixa Postal 0218, Brasilia, D.F. 70359, Brazil; 2: Department of Plant Pathology, Physiology and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;, Email:; 3: EMBRAPA/CPAC, BR 020 Km 18, Caixa Postal 08223, Planaltina, D.F. 70301-970, Brazil


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