saludos!
i believe taktic is a formulation of amitraz, the same active ingredient
found in the miticur strips that were once registered/available for
varroa/tracheal mite control for honeybees in the usa... i think there
has been previous discussion on the bee-l about this, some concerns about
suspected brood toxicity and possible human carcinogenicity, maybe some
calls for its return as an alternative treatment in light of
apistan-resistant varroa... you might want to do some further searches on
it.
 
as far as mango nectar, i can quote from s.e.mcgregor's "insect
pollination of cultivated crop plants":
...the flower opens early in the morning...they secrete nectar in
considerable quantity, which attracts a large number of
insects...however, relatively little pollen is produced... do not appear
to be overly attractive to honey bees, and they tend to open in large
numbers at a time of year when many other flowers are also available...
buena suerte!
 
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