It is easily seen that the exuviae come from metamorphoses of psyllids.
Psyllids are less easily to be seen as they dwell mainly in the leaves
partially curled up by the effects of their stings.
In the bunch of leaves selected, changing leaves is slow but psyllids no longer act.
On other bunchs, as here, the rolled leaves were deformed prior to treatment.
Since then, the new leaves are noted to be in a healthy condition.
26 days after treatment, new leaves were no longer submited to the infestation of psyllids.