Measurements of second-stage juveniles of Heterodera schachtii from California and The Netherlands and a race of H. trifolii from The Netherlands were obtained and compared to determine if these populations can be differentiated by morphometrics. Juvenile lengths of 10 specimens from each of 10 cysts of each population were measured. Dimensions of tail regions of 20 juveniles from individual cy...

Strain T1K, reported to be Rhizobium trifolii strain T1 carrying the drug resistance plasmid RU-1drd, was able to transfer a cluster of nif+ genes to Escherichia coli K-12. Additional genetic material, resembling the gal-chlA region of E. coli, was also transferred from strain T1K. The segregation pattern of these transferred genes suggested that they were on a plasmid. Although strain TIK was ...

The pea leafminer, Liriomyza huidobrensis (Diptera: Agromyzidae), is a highly polyphagous insect pest of global distribution. L. huidobrensis feeds and lays its eggs on leaf tissue and reduces crop marketability because of stippling and mining damage. In field insecticide trials, it was observed that stippling was reduced on plants treated with surfactant alone. The objectives of this study wer...