2003/2004 SURVEY: SPRING ASSESSMENT 2004
- Phoma leaf spot (97.9% crops and 63.7% plants affected) was the most common disease, and was encountered in all regions surveyed. This is the highest incidence of phoma leaf spot recorded in the spring since the survey began in 1987 (the previous high occurred in 2001). Regional disease levels followed trends seen in previous years with highest levels in the south and east and lowest levels in the north.
- Downy mildew was the second most common disease in the spring. However, the incidence (56.7% crops and 12.5% plants affected) was lower than in the previous year when 70.2% crops and 24.9% plants were affected.
- Light leaf spot was recorded in 21.6% crops and 3.2% plants, which was slightly lower than in the previous year. This is the lowest incidence recorded in the survey since 1998.
- Incidence of white leaf spot (11.3% crops and 1.2% plants affected) was lower than in the previous year, when 20.2% crops and 5.7% plants were affected. This was particularly noticeable in the Midlands and Western region where 11.1% crops were affected compared to 94.7% in 2003.
- Incidence of dark leaf spot was higher, with 35.1% crops and 2.7% plants affected, compared to the previous year when 11.7% crops and 1.2% plants were affected.
- Powdery mildew was found in three regions, the Eastern, Northern and South Eastern. This is the first time powdery mildew has been recorded in the spring since 1997.
- Botrytis and Ring spot were not recorded in any region.
Incidence of diseases on the leaf - % crops affected
Incidence of diseases on the leaf - % plants affected
Regional incidence of diseases on the leaf - % crops affected
Regional incidence of diseases on the leaf - % plants affected
