U of M Gardening Information: What's wrong with my plant?

Home > Annuals and Perennials > Hardy Geranium > Spots on leaves
Start Over

Hardy Geranium > Spots on leaves

1 of 3

Credit: Jeff Hahn
Credit: Jeff Hahn
Credit: Jeff Hahn
- CLICK PHOTOS TO ENLARGE -

Fourlined plant bug

Occurs May to early July
Feeding causes brownish or sunken spot on leaves
Nymphs are red or red and black; Adults are greenish yellow with 4 black stripes, 1/4 to 1/3 inch long
More information on Fourlined plant bug...

2 of 3

Credit: Michelle Grabowski
Credit: Michelle Grabowski
Credit: Michelle Grabowski
- CLICK PHOTOS TO ENLARGE -

Rust
Puccinia and Uromyces species

Oval to round yellow leaf spots on the upper side of the leaf
Mature leaf spots are brown or orange in the center with a yellow border
Raised orange blisters on the underside of the leaf
Powdery orange spores rub off of lower leaf surface and can be seen on a white tissue paper

3 of 3

Credit: Michelle Grabowski
Credit: Michelle Grabowski
- CLICK PHOTOS TO ENLARGE -

Powdery Mildew
Erysiphe cichoracearum

Powdery, fluffy, white spots or blotches on leaves, stems and flower parts
Tiny raised bllack dots may be visible within white spots late summer or early fall
Spots typically start on lower leaves but can spread to cover the entire plant
Severely infected leaves may be completely covered in white or grayish white fungi
In some cases, leaves become curled or twisted or turn yellow due to the infection
More information on Powdery Mildew...

Don't see what you're looking for?