We have observed small white bumps (pimple shaped) on the epidermis of an immature fruit and ants patrolling at their vicinity. The quantity of excreted products (small white crystals) is extremely small and licking the structure doesn't taste sweet.
Any simple solution to demonstrate what these structures could be?
Massimo Nepi
Secreting structures can be located with neutral red solution (0.1 g in 1 liter of water. You have to submerge the flower in the satin solution for 20-30 min. secreting structurs are visisble as red spots. You can test the secretion using glucose indicator paper. The positivity of both tests demonstrate the presence of nectaries.
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