That is certainly clear in the case when it is well known that BF is totally absent (cooler regions for instance).
However, in the situation where the wasp is prevalent or has been observed (like in my area), it would be very difficult to determine that a certain caprifig is persistent. In other words, we can't tell, through observation, if a caprifig ripens or retains some syconia from all its crops because of wasps visitation or because a genetic trait/mutation.
One would have to do some elaborate experimentation to reach an accurate conclusion.
Am I missing something?
