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Monitoring aphids on carrot at Wellesbourne 2020-22

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 since December 2020. Counts on the current year's new carrots are also added.

2020-21 Winged per plant Wingless per plant Parasitised per plant 2021-22 Winged per plant Wingless per plant Parasitised per plant
1 Dec 2020 0 0.78 0 5 Jan 2022 0.02 1.10 0
15 Dec 2020 0 0.53 0 24 Jan 2022 0 2.03 0
5 Jan 2021 0 0.21 0 15 Feb 2022 0 1.78 0
19 Jan 2021 0.01 0.63 0 8 Mar 2022 0 1.89 0
3 Feb 2021 0 0.29 0 23 Mar 2022 0.03 30.78 0
16 Feb 2021 0 0.33 0 7 Apr 2022 0.50 57.27 0
3 Mar 2021 0 0.32 0 21 Apr 2022 4.83 96.67 0
17 Mar 2021 0 2.71 0 10 May 2022 -(old carrots) 2.38 117.79 0.04
31 Mar 2021 0 25.35 0 10 May 2022 - (new carrots) 0.07 0.09 0
14 Apr 2021 0 15.24 0 17 May (new) 0.09 0.14 0
27 Apr 2021 0.64 94.47 0.04 24 May (new) 0.12 1.46 0
10 May 2021 1.02 112.7 0 24 May (old) 0.02 3.36 0
24 May 2021 1.59 121.0 0.1 30 May (new) 0.08 1.78 0.02
25 May 2021 (new carrots) 0.21 0.25 0 7 June (new) 0.02 3.23 0
1 Jun 2021 (new carrots) 0.35 3.37 0 13 June (new) 0.01 1.93 0.01
8 Jun 2021 (old carrots) 0.12 21.5 0 21 June (new) 0.01 1.74 0
8 Jun 2021 (new carrots) 0.83 14.3 0 27 Jun 0 1.61 0
15 Jun 2021 (new carrots) 0.17 48.93 0.10 7 Jul 0 0,82 0
22 Jun 2021 (old carrots) 0 1.06 0 12 Jul 0.01 0.59 0
22 Jun 2021 (new carrots) 0 6.13 0.04 19 Jul 0 0 0
29 Jun 2021 (new carrots) 0 2.18 0.08 25 Jul 0 0.04 0
7 Jul 2021 (old carrots) 0 1.06 0 1 Aug 0 0 0
7 Jul 2021 (new carrots) 0 1.2 0.09 10 Aug 0 0 0
14 Jul 2021 (new carrots from now onwards) 0 0.18 0.04 24 Aug 0 0 0
20 Jul 2021 0 0.07 0.06 12 Sep 0 0 0
27 Jul 2021 0 0 0.02        
16 Aug 2021 0 0.03 0.01        
1 Sep 2021 0 0 0        
28 Sep 2021 0 0.14 0        
12 Oct 2021 0 0.24 0        
26 Oct 2021 0.04 0.16 0        
10 Nov 2021 0 1.2 0        
23 Nov 2021 0 0.69 0        
8 Dec 2021 0.02 0.27 0        


Willow-carrot aphids