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Monitoring aphids on carrot at Wellesbourne 2020-21

Researchers at Warwick Crop Centre have been following the development of overwintering aphid populations on ‘open’ overwintered carrots over the last few years and the table below shows their counts this winter. Counts on this year's new carrots are also being added.

  Winged per plant Wingless per plant Parasitised per plant
1 Dec 2020 0 0.78 0
15 Dec 2020 0 0.53 0
5 Jan 2021 0 0.21 0
19 Jan 2021 0.01 0.63 0
3 Feb 2021 0 0.29 0
16 Feb 2021 0 0.33 0
3 Mar 2021 0 0.32 0
17 Mar 2021 0 2.71 0
31 Mar 2021 0 25.35 0
14 Apr 2021 0 15.24 0
27 Apr 2021 0.64 94.47 0.04
10 May 2021 1.02 112.7 0
24 May 2021 1.59 121.0 0.1
25 May 2021 (new carrots) 0.21 0.25 0
1 June 2021 (new carrots) 0.35 3.37 0
8 June 2021 (old carrots) 0.12 21.5 0
8 June 2021 (new carrots) 0.83 14.3 0
15 June 2021 (new carrots) 0.17 48.93 0.10
22 June 2021 (old carrots) 0 1.06 0
22 June 2021 (new carrots) 0 6.13 0.04
29 June (new carrots) 0 2.18 0.08
7 July (old carrots) 0 1.06 0
7 July (new carrots) 0 1.2 0.09
14 July (new carrots) 0 0.18 0.04
20 July (new carrots) 0 0.07 0.06
27 July (new carrots) 0 0 0.02
16 August 0 0.03 0.01
1 September 0 0 0
28 September 0 0.14 0
12 October 0 0.24 0
26 October 0.04 0.16 0
10 November 0 1.2 0

Willow-carrot aphids