Table 1 Sampling details of S. avenae field and suction trap collections

From: Evidence for gene flow and local clonal selection in field populations of the grain aphid (Sitobion avenae) in Britain revealed using microsatellites

Sample Code

Farm

Field

Collection date

N

Cultivar of winter wheat

Growth stage

Insecticide applications

Location relative to trap

Field collections

RA

Rothamsted, Herts

Field A (Delharding)

30 June 1997

25

Genesis

75

Draza 23/10/96

0.3 km NW

RB

 

Field B (Great Knott II)

1 July 1997

23

Caxton

75

None

1.25 km W

HA

Hemel Hempstead, Herts

Field A (Hill Top)

7 July 1997

24

Consort

69

Hallmark 25/10/96, 16/11/96

9 km WSW

HB

 

Field B (Water End)

7 July 1997

24

Shangow

73

Hallmark 15/11/96

9 km WSW

GA

Garford, Oxon

Field A

28 June1997

24

Information

85

Autumn spray

65 km WSW

   

15 July 1997

 

not available

   

GB

 

Field B

15 July 1997

24

Information

85

Autumn spray

65 km WSW

  

(nr. East Hanney)

  

not available

   

Suction trap collections

        

R e 97

Rothamsted Tower suction trap

 

30 June – 10 July 1997

50

N/A

N/A

N/A

N/A

R 97

Rothamsted Tower suction trap

 

21–26 July 1997

54

N/A

N/A

N/A

N/A

  1. N=sample size. The growth stage of the crop at the time of sampling was recorded (Tottman and Broad, 1987) and information on the cultivar of wheat and the insecticide regime was provided for Rothamsted and Hemel Hempstead, although detailed information was not available for Garford. N/A=Not available.
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