Disease

Diagnosing Disease in Crabapple Trees

Q. Every year my crabapple leaves get brown spots on them which cause the leaves to fall off of the tree before the end of the summer.

Apple Scab, Crabapple Tree Disease

Q. My crabapple trees (and those of many of my neighbors) have suffered from a disfiguring disease for several years.

Peony Blight

Q. I have an established planting of peony bushes that are attacked by blight every year. What is the best way to prevent this disease from recurring?

Preventing Powdery Mildew on Phlox

Q. What can I do to prevent powdery mildew from attacking my phlox and zinnias?

Disease and insect resistance in tomatoes

Q: What do the letters VFNT mean on the tomato plant labels?

A: Tomatoes are prone to a number of diseases and pests. Tomatoes have been hybridized to be resistant to common problems. The following letters represent disease/insect resistance and may appear alone or in a combination:

V = verticillium wilt resistance (fungal disease)
F = fusarium wilt resistance (fungal disease)
N = nematode resistance (insect)
T = tobacco mosaic virus resistance (viral disease)