I have a 36" tree rose, and i noticed that there are birds building a nest on it. I would like to leave the nest as is but i am worried that the plant can catch a virus from bird droppings(i read this on the internet somewhere). I would like to know if i should dismantle this? I have had this tree rose for almost 10 yrs now and i have tried to keep it pest and pesticide free till date with mostly lady bugs. Any help is appreciated.