  The results of speckle interferometric observations at the 4.1 m Southern
Astrophysical Research Telescope (SOAR) in 2018 are given, totaling 3097
measurements of 2427 resolved pairs with separations from 11 mas to 5.9"
(median 0.15", magnitude difference up to 7 mag) and non-resolutions of 624
targets. This work continues our long-term speckle program. Its main goal is to
monitor orbital motion of close binaries, including members of high-order
hierarchies and Hipparcos pairs in the solar neighborhood. Also,
pre-main-sequence stars in the Orion OB1 association were surveyed, resolving
26 out of 118 targets. In addition, we report discovery of 35 new companions
among field visual multiples (some of which are likely optical) and first-time
resolutions of another 31 pairs. By combining the measurements given here with
the published ones, we computed 76 orbits for the first time and updated
orbital elements of 34 visual binaries. Their periods range from 0.65 to 1100
years, and their quality varies from first tentative solutions of grade 5 to
accurate elements of grades 1 and 2. Finally, a list of 53 spurious pairs
discovered by various techniques and unresolved at SOAR
