Question: I have a 'Bartlett' pear tree, and this year I have a lot of small black ... of leaves and fruit occurs when leaves remain continuously wet for at least 10 hours. Sooty spots appear ...

We have a lot of prickly pear cactus in the yard. I just noticed that some of the bigger plants have black spots on them. Is there something we can do to stop or protect the others in our yard ...

Dear Jane: Enclosed are leaves from my 25-foot-tall, 6-year-old Hoisen pear tree that suddenly developed black specks and spots on the underside of all of its leaves in early June. Now some leaves ...

Q: My black-eyed susans have black spots on the leaf that multiply until the leaf just dies. I've been treating them with a fungicide, but it just gets worse and worse. Is this a fungus or ...