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Phylogeny of Criconematina Siddiqi, 1980 (Nematoda: Tylenchida) based on morphology and D2-D3 expansion segments of the 28S-rRNA gene sequences with application of a secondary structure model
DNA data support monophyly for the genera Mesocric onema, Hemicriconemoides and Criconema and reject the hypothesis of a single origin of criconematids with a cuticular sheath or 'double cuticle'.
Isozyme patterns of exotic Meloidogyne spp. populations.
By means of a combination of EST and MDH phenotypes, one population collected from guava in Venezuela and one population from tomato in Cuba were both identified as M. mayaguensis, and they showed the greatest polymorphism among populations, with a total of eight polymorphic bands detected.
Known and new species of Mesocriconema Andrassy, 1965 (Nematoda: Criconematidae) from Venezuela
Two species of Xiphidorus Monteiro (Nematoda: Dorylaimida): new records for Venezuela.
Xiphinema amazonensis Uesugi, Huang et Cares and X. minor Rashid, Coomans et Sharma constitute new records for Venezuela. X. amazonensis is reported for the first time since its description from…
Nematodes of Tropical Fruit Crops in Venezueka
- R. Crozzoli
Data on nematodes of main fruit crops in Venezuela are reviewed, including acerola, avocado, banana and plantain, breadfruit, cashew, citrus, coconut, date palm, fig, grapevine, guava, mango, papaya,…
Pathogenicity of MELOIDOGYNE EXIGUA on coffee (COFFEA ARABICA) in pots
The relationship between a geometric series of fourteen initial population densities (Pi) of Meloidogyne exigua between 0 and 512 eggs and juveniles/cm 3 soil and growth of coffee (Coffea arabica)…
Effect of Rotylenchulus reniformis on the growth of papaya in pots.
The relationship between a geometric series of ten initial densities (Pi) of Rotylenchulus reniformis between 0 and 64 eggs, juveniles and young females/cm3 soil and growth of papaya (Carica papaya)…
Geographical Distribution, Hosts and Biological Characteristics of Trophonema Okamotoi (Nematoda: Tylenchulidae)
Trophonema okamotoi populations from Florida showed intraspecific morphometric variability and did not differ from those from Costa Rica and Venezuela and Histological observations of this species showed this species to be a cortical feeder.
EFFECT OF GLOBODERA ROSTOCHIENSIS ON THE YIELD OF POTATO IN VENEZUELA
The relationship between initial densities (Pi) of Globodera rostochiensis pathotype Ro2 and yield of the susceptible potato cultivar Andinita and yield response to Pi fitted the model y=m+(lm)z[supPu[supT]; in which y is the relative yield, m is the minimum relative yield and Tis the tolerance limit.
PLANT PARASITIC NEMATODES ASSOCIATED WITH CITRUS IN VENEZUELA
A nematode survey was carried out in the main citrus growing areas of Venezuela and thirty four species were identified, the most economically important and widespread of which is T. semipenetrans.