Abstract

During a survey on the biodiversity of plant-parasitic nematodes of natural areas in Botswana, Bitylenchus ventrosignatus was discovered around the rhizosphere of wild grass. The nematodes were extracted using the tray method and then fixed according to the available protocols. The morphological characters fit well with the description of B. ventrosignatus. In addition, molecular analysis using 18 S and 28 S rDNA indicated 98% (KJ461617) and 95% (KJ461567) similarity with the Spanish population of B. ventrosignatus. The phylogenetic analysis of 18 S and 28 S rDNA placed the examined population with other populations of B. ventrosignatus in a group with a posterior probability support value of 100. According to published literature, this is the first report of B. ventrosignatus from Botswana.

Highlights

  • During a survey on the biodiversity of plant-parasitic nematodes of natural areas in Botswana, Bitylenchus ventrosignatus was discovered around the rhizosphere of wild grass

  • The morphology and morphometrics are in agreement with those reported by Fortuner and Luc (1987) and Geraert (2011)

  • Fortuner and Luc (1987) reported B. ventrosignatus lacks a postanal intestinal sac, the character observed in the Botswanan specimens (Fig. 2E)

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Summary

Introduction

During a survey on the biodiversity of plant-parasitic nematodes of natural areas in Botswana, Bitylenchus ventrosignatus was discovered around the rhizosphere of wild grass. Members of Bitylenchus and Tylenchorhynchus differ in areolated outer bands of lateral fields, a large postanal intestinal sac containing intestinal granules and fasciculi, relatively more thickened cuticle at the female tail tip, and gubernaculum lacking a crest (Handoo et al, 2014). Their ecological behavior and crop damage are not well understood. During a survey on nematodes of the natural areas of Botswana, B. ventrosignatus (Tobar Jiménez, 1969) Siddiqi, 1986 was recovered from a wild grass in Botswana. This is the first report of B. ventrosignatus from Botswana

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