Hardy Eucalyptus Board
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Re: Eucalyptus defoliation
the euc. with the brown leaves is clearly in distress and likely dying--looks kind of like a root fot (phytophera???) if so, the tree MAY be totally dead with no resprouting. scratch the bark off a young branch and if you can't find any green the branch at least is dead. it may be better to cut the tree down if you don't see any growth in the next several months (or sooner if there are aesthetic or safety concerns). many eucs don't like the combination of heat and humidity that you seem to have gone through. some do ---like tereticormis which has a range extending to new guinea and tends to like hot wet summer conditions. species like tesellaris, citriodora, or torelliana (now classified as corymbias---maybe even northern forms of papuana ("ghost gum") may be better species to look into . alba and grandis ("swamp mahogany") might be worth a shot as well. good luck.