Initial animated particles on a force field path: How to control/hide? I can hide the emitter easily and control the end where the particles "die out". 

Yet I'm also looking for a way to hide the initial portion of particles lumped up i front of the cue of a system with a path force field. 

Yet I need a procedure to control/hide the initial particles on the curve like you can hide the "unborns".

Please keep in mind I'm going for the "non-curve-guide" method since I learned this will produce the best result.

Kind regards, Mikael
Texture mask to hide unwanted particles in center (red outline) but keep surrounding visible (green outline).

Emitter object's coordinates controls spherical texture which gradient splits material in two shaders: default and invisible (holdout or transparent BSDF for your choice).

Holdout is easier for render but needs compositing, while transparent with many overlayed particles need many transparency bounces to get clean results.