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Table 1 Cumulated weekly trap counts, mean (SE), for thrips near a cabbage field in North Wiltshire, PEI, from July 22 to September 2, 2014 showing impact of location on thrips abundance throughout the season

From: Onion thrips (Thrips tabaci (Thysanoptera: Thripidae)) in cabbage on Prince Edward Island: observations on planting date and variety choice

Week+

Trap location

F(df), P

North

East

South-edge

South-outer*

1

1.0 (0.0)

5.6 (1.9)

3.0 (2.0)

7.3 (1.9)

1.5 (3,11), 0.26

2

8.0 (2.5)b

25.4 (4.8)a

15.0 (3.6)ab

19.3 (1.7)ab

4.2 (3,13), 0.03

3

24.0 (4.6)c

72.2 (14.6)b

39.0 (6.5)bc

121.0 (13.6)a

13.2 (3,13), 3.05 × 10−4

4

39.5 (11.6)b

60.3 (7.8)b

37.7 (3.7)b

140.0 (4.7)a

37.4 (3,12), 2.28 × 10−6

5

14.7 (1.2)c

53.3 (4.6)b

49.0 (7.6)b

93.5 (6.9)a

31.1 (3,12), 6.10 × 10−6

6

7.7 (1.5)b

42.0 (2.7)a

36.7 (2.0)a

38.5 (6.8)a

16.2 (3,12), 1.62 × 10−4

7

1.5 (0.6)b

6.7 (1.7)b

3.5 (1.2)b

8.3 (1.6)a

4.52 (3,12), 0.02

All weeks

14.7 (3.0)c

37.6 (5.0)b

26.3 (4.0)bc

61.1 (10.0)a

9.7 (3109), 1.03 × 10−5

  1. Letters within each week denote significant differences using Tukeys’ HSD
  2. * traps placed 3 m from edge of the field
  3. +Week 1: July 21–24, Week 2: July 25–28, Week 3: Jul 31–Aug 4, Week 4: Aug 7–11, Week 5: Aug 14–19, Week 6: Aug 21–26, Week 7: Aug 28–Sept 2