The effect of insecticide application by dropleg sprayers on pollen beetle parasitism in oilseed rape
Supplementary Information
doi.org/10.1007/s10526-021-10111-9
Supplementary Table S1
Number of larvae per treatment and sampling date assessed for parasitism with T. heterocerus in the spraying trials from 2016-2019
2016 24.05.2016 31.05.2016
Control 160 160
Conventional Biscaya 157 151
Conventional Mospilan 160 160
Dropleg Biscaya 160 160
Dropleg Mospilan 160 151
2017 18.05.2017 22.05.2017 29.05.2017
Control 59 133 335
Conventional Biscaya 63 30 136
Conventional Mospilan 77 35 164
Dropleg Biscaya 39 86 205
Dropleg Mospilan 35 87 263
2018 08.05.2018 15.05.2018 22.05.2018 29.05.2018
Control 200 814 907 200
Conventional Biscaya 200 930 602 180
Conventional Mospilan 200 832 614 187
Dropleg Biscaya 200 749 860 201
Dropleg Mospilan 196 799 794 200
2019 02.05.2019 09.05.2019 16.05.2019 22.05.2019 29.05.2019
Control 209 754 2421 1517 271
Conventional Biscaya 1652 1398 617 302 189
Conventional Mospilan 1240 1130 722 516 259
Dropleg Biscaya 924 1257 994 573 201
Dropleg Mospilan 445 1025 1834 1041 218
Supplementary Table S2
Average parasitism of pollen beetle larvae by Phradis interstitialis (% ± SE) in the spraying trials 2016-2019 (NA = not assessed)
2016 2017 2018 2019
% parasitism 9.1 ± 1.5 NA 13.6 ± 3.0 10.4 ± 3.6
% multiparasitism (Phradis + Tersilochus)
5.9 ± 0.9 NA 3.09 ± 1.1 9.8 ± 3.7
N 1147 NA 330 631
Supplementary Figure S1
Fig. Location of the field trials in the years 2018 and 2019. The vertical distribution of insect pests and their parasitoids was assessed outside the dropleg trial area, with a portable aspirator (pathways indicated by dashed lines).
The direction of the tramlines (pathways for machines) in the right field was changed in 2019.
Supplementary Figure S2
Fig. Number of individuals (dots) sampled with an aspiration trap on a 5 m transect of a) Dasineura brassicae, b) Brassicogethes aeneus and c) Ceutorhynchus obstrictus in the flowering canopy and below flowering canopy of OSR at different sampling dates during the period of flowering in 2018 and 2019. Lines = regression lines (method: loess).
