|Many large holes are appearing in the leaves of our hibiscus, geraniums, gerbera daisies, and hydrangeas. The only
|Answer from NGA
March 11, 2010
|Probably caterpillars of some sort. They hide on the undersides of leaves and are sometimes hard to see - but their damage is quite evident. Look also for frass (bug poop) on the upper sides of the leaves. If you see small black pellets, caterpillars are feasting on the plants. The botanical Bt (sold as Dipel or Thuricide) will control them.
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