Your report (21 June) urging gardeners to be frog friendly is, of course, to be welcomed. However, cherishing amphibians raises a dilemma because one of the major threats to frog populations is predation by dragon fly larvae, rapacious creatures up to two inches long and said to be capable of eating anything not bigger than themselves. This year not a single froglet will emerge from my pond, despite the protection given to the frog spawn during the late snow and frost. The entire population of tadpoles has been eaten by dragon fly larvae. The fact that the adult dragon fly is a magnificent creature in its own right, and, like adult frogs and toads, eats creatures we might regard as garden pests, leaves me in a quandary: is it OK to kill dragon flies to protect frogs, or should I leave it to nature to sort itself out?
Peter Malpass
Bristol
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