PP 1/207 (2)
Appendix 2 Crop interception values for calculating Predicted Environmental Concentrations (PEC)
Table 1 gives interception data for specific growth stages of different crops. If the proposed crop is not present in the
table a comparable crop should be used. Note that the interception data in Table 1 is only valid for applications made
directly onto the crop.
Table 1. Interception (%) by crops and growth stage.
BBCH
1
Crop
Bare –
emergence
(00-09)
Leaf
development
(10-19)
Stem
elongation (20-
39)
Flowering
(40-89)
Senescence
Ripening
(90-99)
Bean (field + vegetable)
0
25
40
70
80
Cabbage
0
25
40
70
90
Carrot
0
25
60
80
80
Cereal (spring + winter)
0
25
50 (tillering)
70 (elongation)
3
90
90
Cotton
0
30
60
75
90
Grass
2
0
40
60
90
90
Linseed
0
30
60
70
90
Maize
0
25
50
75
90
Oilseed rape(summer+winter)
0
40
80
80
90
Onion
0
10
25
40
60
Pea
0
35
55
85
85
Potato
0
15
50
80
50
Soybean
0
35
55
85
65
Strawberry
0
30
50
60
60
Sugar beet
0
20
70 (rosette)
90
90
Sunflower
0
20
50
75
90
Tobacco
0
50
70
90
90
Tomato
0
50
70
80
50
1
The BBCH code is indicative (BBCH, 1994).
2
A value of 90 is used for applications to established turf
3
BBCH code of 20-29 for tillering and 30-39 for elongation
These values and the table are taken from the “
FOCUS groundwater scenarios in the EU review of active substances
”
Report of the FOCUS Groundwater Scenarios Workgroup, EC Document Reference SANCO/321/2000 rev.2, 202pp
(Table 1.6 in Version 1.1).
Appendix 3 Method for screening the sensitivity of crop species to active substances present in soil
Test plants are sown in pots containing treated soil, into which the herbicide or active substance has been incorporated
at known levels. Test species are chosen to be representative of the range of crops which could be sown as following
crops. The bioassay should also include species already demonstrated to be very sensitive to the active substance.
Enough test plants should be sown so that sufficient numbers of plants emerge for the purpose of the test. The test
should be replicated and randomized, and plants should be grown in controlled conditions so that growing conditions
are the same for all plants. An assessment should be made of emergence and all aspects of growth of the test plants in
the treated soil compared with plants grown in untreated soil. Plant weight should be measured after an interval
sufficiently long for effects of the active substance to be seen; this depends on the mode of action of the active
substance.
For further information, see also OECD (2006).
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