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Hello, recently (starting a week ago) my bonsai began to lose leaves. I wasn't too worried to begin with, but now it has lost most leaves including some that had grown recently. Leaves turn slightly yellow, begin to darken in spots around the edges, then turn very yellow and whither entirely. The soil has been kept damp, maybe a little muddy at the bottom.

Any idea what is happening and advice?
Thanks in advance!

keeping tyrees in wet soil in a dark environment can cause this.