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For studies with insects which are sensitive to air particle-velocity, so called "particle-velocity" microphone are used (e.g. here, here, here, here). …

I need to monitor the sound level of the playback stimuli they are exposed to, however, I only have a pressure microphone and this is not the physical quantity they are sensitive to. …

distance $r$ far greater than the wave length, particle velocity and pressure are proportional: $$ v(r) = \frac{p(r)}{Z}$$ As a consequence, as long as your speaker is in the far-field of your insect/microphone … If not, it is better to have a pressure-gradient microphone (see SE question How reliable are "particle-velocity" microphones?). …

I have two possibilities: Microphone. … world-leading team working on whitefly vibratory communication put the edge of the subtrate leaf in contact with a paper which acts as a diffuser to amplify the diffused vibration to the air; then they use a microphone …

From a theoretical point's of view (i.e. without testing it), would the shotgun microphone work properly enough if its tip is inside the plastic tube (case B below)? … Or do you think that leaving a small space between the tube and the microphone tip would be better (cas A below)? …

To be safe, I would use microphones which the specifications explicitly say that they can handle such humidity. RF condenser technology is described as "weather-proof" by the manufacturer (e.g. here) …

You can estimate the constant to add to your signal in order to make it close to a dB SPL (ref 20µPa), however this depends not only on the microphone sensitivity (which rules the Pressure-to-voltage conversion … ), but also on all the other amplitude gains between your microphone and your displayed signal: the analog amplifier gain, if any (e.g. from the sound interface) the digital gains, if any, from the: …

Whiteflies were beneath the leaf and did produce their tremors (recorded with an air microphone, following a similar method to Kanmiya 2006). …