Leaves are unusually colored, spotted, or necrotic
Herbicide Damage
Gramoxone on leaves. Plants can usually overcome this damage if it is isolated. Symptoms can be varied.
![gromoxone damage](https://berries.cals.ncsu.edu/wp-content/uploads/sites/142/2018/10/gromoxone-damage-2.jpg)
Surflan damage in young primocanes
![surflan](https://berries.cals.ncsu.edu/wp-content/uploads/sites/142/2018/10/surflan.jpg)
Diseases
Orange rust is a systemic fungal disease and infected plants never recover. Orange spots occur on the undersides of leaves, but can appear on canes.
![orange rust wild blackberry](https://berries.cals.ncsu.edu/wp-content/uploads/sites/142/2018/10/orange_rust_wild_blackberry.jpg)
Late rust
![blackberry late rust](https://berries.cals.ncsu.edu/wp-content/uploads/sites/142/2018/10/blackberry_late_rust.jpg)
Small white dots throughout a leaf typically found in lower dense foliage is a result of spider mite infestation. Mites and eggs can be seen on the underside of leaves along with delicate webbing.
![Blackberry Spider mites](https://berries.cals.ncsu.edu/wp-content/uploads/sites/142/2018/10/BlackberrySpidermites-563x422.jpg)
Pierces disease is a bacterial disease that is lethal to grapevines, and has been detected in wild blackberry in western North Carolina. At this time, it is not thought to be a problem in blackberry.
![pierces disease](https://berries.cals.ncsu.edu/wp-content/uploads/sites/142/2018/10/pierces_disease_bk1.jpg)
Veins are yellow or necrotic, leaves have ringspots or yellow blotches (go to virus section)