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Summary

Root-knot nematodes (RKN), Meloidogyne spp., have a wide host range and are common in the Mediterranean area. Cultivated lavender (Lavandula angustifolia) was found naturally infested by M. hapla in Kozani area, the first documented infestation of this crop by RKN in Greece. Oxalis pescaprae, a common winter weed in Crete, was found to be a host of M. javanica under artificial inoculation. This weed acts as a potential winter host of the nematode in fields cultivated with vegetable crops. Two populations of M. ethiopica were found in kiwi and maize in Greece in the past. Recently, populations of M. ethiopica from Europe were re-classified as M. luci, based only on the population isolated from kiwi for Greece. In the current work, the RKN populations originating from kiwi and maize and maintained on tomato, were identified as M. luci. Nematode species identification was determined by electrophoretic analysis of protein extracts obtained from females.

Abstract

The root-knot nematode Meloidogyne arenaria was found in Greece infecting balm (Melissa officinalis L.) and grapevine (Vitis vinifera L.). The isolate from balm was M. arenaria while the one from grapevine was a mixture of M. arenaria and M. javanica (prevalent species). This is the first report of the M. arenaria species in the country in which identification was based on biochemical methods and its occurrence on balm is a new host record.

from IA-PAR, Instituto Agronômico do Paraná, collected in the municipality of Araucária (25°35'34"S, 49°24'36"W). Roots were washed with tap water and adult females were extracted from dissected roots; after, the extraction of nematodes was carried out according to Boneti and Ferraz (1981) . Then, nematode population was estimated. Fig.1 Common bean roots showing natural galls caused by Meloidogyne luci (A), perineal pattern ofM. luci(B) and esterase phenotype of M. luci detected in common bean (L3: M. luci from Araucária, PR; L3*: M. luci reference