RESUMO
In April-August 2018, samples of galled roots with rhizosphere soil were collected from almond orchards in Atwater, Merced County and Bakersfield, Kern County, California. Almond trees (Prunus dulcis) grafted on 'Hansen 536' and 'Brights Hybrid®5' (peach-almond hybrid) rootstocks showed strong symptoms of growth decline. Extracted root-knot nematodes were identified by both morphological and molecular methods as M. floridensis. Meloidogyne floridensis was initially found in Florida, USA, and has not been reported from any other states and countries. This is a first report of M. floridensis in California and outside of Florida.In April-August 2018, samples of galled roots with rhizosphere soil were collected from almond orchards in Atwater, Merced County and Bakersfield, Kern County, California. Almond trees (Prunus dulcis) grafted on 'Hansen 536' and 'Brights Hybrid®5' (peach-almond hybrid) rootstocks showed strong symptoms of growth decline. Extracted root-knot nematodes were identified by both morphological and molecular methods as M. floridensis. Meloidogyne floridensis was initially found in Florida, USA, and has not been reported from any other states and countries. This is a first report of M. floridensis in California and outside of Florida.
RESUMO
Geocenamus angelescresti n. sp. (Nematoda: Belonolaimidae) was found in rhizosphere of Pinus ponderosa and Arctostaphylos patula growing along Angeles Crest Highway in the San Gabriel mountains of California. The nematode species is characterized by a round-to-hexagonal labial disc with six bulging sectors, lateral sectors of first labial annule smaller than the submedian sectors, six to eight labial annules, distinct deirids, stylet length (45-57 microm), body length (666-996 microm), lateral field with or without areolation of outer bands on tail, and a rounded, smooth tail terminus. Geocenamus angelescresti n. sp. most closely resembles G. superbus but differs from it by a shorter stylet (45-57 microm vs. 67 microm), shorter body length (666-996 microm vs. 1,200 microm), bulged sectors and smaller diameter of the labial disc (2.3-2.8 microm vs. 4.0 microm, round, smooth), longer female tail (54-68 microm vs. 41 microm), and a narrower tail terminus. An emended description of the genus and a list of valid species are provided. Geocenamus arcticus (Mulvey, 1969) Tarjan 1973 and G. uralensis Baydulova 1983 are proposed as junior synonyms of G. tenuidens Thorne &Malek 1968. An identification key to 12 species of Geocenamus and a compendium of important diagnostic morphological characters used in the identification of species are included.
