I have a few trees on my front yard. Two of them (a pear tree and a rose tree) have new growth out of the soil, just around the main trunk. The pear tree also has new branches growing from the lower portion of the main trunk. However, the growth from the top has stalled.

I have had these 2 trees for almost 10 years. I don't remember they had this issue during the first few years. The issue came out maybe 2-3 years ago and I simply trim these weird growth away. But it get really bad this year.

Any idea what happened to these 2 trees? They are about 30 feet away from each other and other trees don't have this issue.

Thanks.