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Should do. It depends on the weather a bit. In my area (Perth) they keep putting on new growth until fairly late in the season. From memory, they don't fully lose their leaves until winter. I also forgot to mention that the ph of your soil might not be that conducive to growing this plant. It...

Maybe some insider knowledge on my part... I studied horticulture at TAFE years ago ;) Good stuff. Just keep an eye on them to make sure the bugs don't come back. It's hard to tell. It wouldn't really explain the second tree being attacked.

The issue is not the bugs, the issue is the plants. When the plants are going well they don't get attacked. When the plants are stressed, the bugs attack. Fix the plants, fix the problem. Sounds simple, it's not. :( The things to check are: water, fertiliser, trace elements, soil compaction...

I am worried about the yellow leaves on the left plant too. Mop top should not look like that. So either the soil has a deficiency or the bugs have already migrated to that tree. I'm concerned that if you don't find the underlying problems that the problem will reoccur. In my experience, you...

If the new plants become stressed, the bugs will attack the new ones too. You need to find out what the issue was: water, fertilizer, soil compaction, trace, that caused the plant to become stressed in the first place. To get rid of the pests in the existing tree, you can cut off the affected...

To add to the above: http://www.yates.com.au/garden-expert/answers/diseases/4774-robinia-moptop-sawdust-and-dieback-appearing Apparently they don't attack healthy trees. If the leaves were yellowing before the attack, there may be trace elements missing from the soil. I had yellowing leaves...