Remote sensing technology is being examined as a field worthy means for predicting reniform nematode population densities in the cotton rhizosphere using hyperspectral reflectance data and self-organized maps. Our objectives were to determine 1) the hyperspectral reflectance of cotton plants affected by different reniform nematode population levels in controlled microplot tests and in fields na...

The stunt nematode, Tylenchorhynchus claytoni, was found to cause a reduction in root volume (cm) of loblolly pine at population densities equivalent of 125 nematodes/100 cm (6 in) soil and greater. The results of a host range test conducted in containers under controlled conditions determined that buckwheat cultivar (Fagopryum esculentum ‘Mancan’), velvetbean (Mucuna pruriens), Kobe lespedeza ...

AMONG IMPORTANT NEMATODE SPECIES OCCURRING IN JAPAN, CURRENT RESEARCH ACHIEVEMENTS WITH THE FOLLOWING FOUR NEMATODES ARE REVIEWED: 1) Soybean cyst nematode (SCN), Heterodera glycines - breeding for resistance, race determination, association with Cephalosporium gregatum in azuki bean disease, and isolation of hatching stimulant. 2) Potato-cyst nematode (PCN), Globodera rostochiensis - pathotype...

Treated and nontreated field plots were assayed, and the population density of each plant-parasitic nematode present was compared with crop growth and yield and with the population densities of other nematode species in the same plots. The strongest correlations between nematode population densities and growth responses occurred when soil assays for nematodes were made 55-73 days after planting...

in order to assay the pathogenicity of the entomopathogenic nematode, heterorhabditis bacteriophora poinar, 1975 on the indigenous population of common earwig, forficula auricularia l., several concentrations including 100, 250, 500, 1000, 1500, 2000 and 3000 (ijs/ml of dw) were used in the laboratory conditions. in this experiment, effects of time (f 1, 91= 4.22, p

Pines responded to inoculation with Bursaphelenchus xylophilus by changes in reducing and nonreducing carbohydrate concentrations dependent on the pine species and the pathotype of B. xylophilus with which the trees were inoculated. Carbohydrate concentrations, in compatible pine-nematode pathotype combinations, decreased initially after inoculation and then increased slightly before decreasing...

Future areas of emphasis for research and scholarship in nematode ecology are indicated by pressing agricultural and environmental issues, by new directions in applied nematology, and by current technological advances. Studies in nematode ecology must extend beyond observation, counting, and simple statistical analysis. Experimentation and the testing of hypotheses are needed for understanding ...

The application of geostatistics to plant nematology was made by evaluating soil and nematode data acquired from 200 soil samples collected from the A(p) horizon of a reed canary-grass field in northern Minnesota. Geostatistical concepts relevant to nematology include semi-variogram modelling, kriging, and change of support calculations. Soil and nematode data generally followed a spherical sem...