Physiological & Chemical Disorders
The information linked below is from MSU Extension’s handy pocket-sized guide for grape IPM scouting. Order in English or Spanish for a spiral-bound field guide.
Chemical injury
- Copper injury
- Diuron injury
- Glyphosate injury
- Paraquat injury
- Pesticide spray injury
- Phenoxy herbicide (2,4-D) injury
- Simazine injury
Abiotic vine condition
- Bird damage
- Bunch stem necrosis
- Chimera
- Guttation
- Hail damage
- Lack of fruit set
- Lightning
- Ozone injury
- Pearl bodies
- Sour soil
- Spring freeze injury
- Sun scald
- Winter injury