Pest Assessments

Brown rust risk map
2017/2018 Survey: Spring Pest Assessment 2018
Oilseed Rape Survey

Twenty five plants from each of 50 sites are destructively sampled at the The Food and Environment Research Agency during the Spring assessment. These are checked for Cabbage Stem Flea Beetle (CSFB) larvae and Rape Winter Stem Weevil (RWSW) larvae. A summary of the results of this sampling are provided below. This includes a graphical comparison with the results from previous years.

Brown rust risk map
Sample breakdown
Region No. of plants sampled No. of leaves sampled Mean No. of leaves per plant
East 275 273 0.99
Midlands & West 225 0 0.00
North 200 0 0.00
South-East 100 0 0.00
South-West 100 0 0.00
National summary 900 273 0.30
Brown rust risk map
Sample breakdown
Region No. of large CSFB larvae No. of small CSFB larvae Mean CSFB larvae per plant No. of RWSW larvae Mean RWSW larvae per plant
East 466 0 1.69 0 0
Midlands & West 565 0 2.51 0 0
North 945 0 4.72 6 0.03
South-East 241 0 2.41 0 0
South-West 140 0 1.4 0 0
National summary 2357 0 2.62 6 0.007
Brown rust risk map
Sample breakdown
Region No. of sites with mean larvae
per plant >= 2 and < 5
No. of sites with mean larvae
per plant >= 5
East 3 1
Midlands & West 2 1
North 3 2
South-East 3 0
South-West 1 0
National summary 12 4
Brown rust risk map
Historical comparisons

The graph below shows the mean number of CSFB larvae per plant in the East region, over the last 7 years, in the Spring assessment.