Effects of reduced pesticide use on flora and....., Danish Environmental Protection Agency

Effects of reduced pesticide use on flora and fauna in agricultural fields

Table 3.7.
Estimated dry masses of arthropods separated into the most important orders. The numbers given are least squares estimates of the mean dry mass of 5-7 samples per year in the period late May - mid August. In cereals the estimates are "mg/3 m²" and in beets "mg/1.5 m²". The estimates are followed by 95% confidence intervals in square brackets. P-values for test of significance of the factor "dosage" are given (*: p<0.0.5, **: p<0.01, ***: p<0.001). Significant differences (p<0.05) between the different dosages are found by paired t-tests and are indicated by different letters.

Crop	Order	Normal dosage		Half dosage		Quarter dosage		p-value
Barley	Araneae	6.3	[ 5.6; 7.0]	6.4	[ 5.7; 7.2]	6.3	[ 5.7; 7.1]	0.9680 ns
	Coleoptera	176.2 a	[ 161.0; 192.7]	175.6 a	[ 160.5; 192.0]	212.0 b	[ 193.8; 231.9]	0.0059 **
	Diptera	114.2	[ 91.2; 142.9]	111.9	[ 89.4; 140.1]	135.6	[ 108.3; 169.7]	0.4121 ns
	Hemiptera¹	10.7	[ 8.9; 12.9]	12.8	[ 10.6; 15.3]	13.9	[ 11.5; 16.7]	0.1417 na
	Hymenoptera	22.1	[ 16.1; 30.3]	24.2	[ 17.6; 33.2]	33.1	[ 24.1; 45.2]	0.1730 ns
	Lepidoptera	4.6	[ 3.1; 6.6]	3.8	[ 2.5; 5.5]	6.9	[ 4.8; 9.8]	0.0763 ns
	Others	21.5 a	[ 16.3; 28.3]	23.5 a	[ 17.8; 30.9]	35.9 b	[ 27.3; 46.9]	0.0243 *
Wheat	Araneae	8.3	[ 7.1; 9.8]	9.3	[ 7.9; 10.9]	8.1	[ 6.8; 9.5]	0.4388 ns
	Coleoptera	232.5	[ 191.1; 282.8]	261.9	[ 215.3; 318.5]	262.5	[ 215.8; 319.3]	0.5932 ns
	Diptera	195.1	[ 155.3; 244.9]	208.5	[ 166.0; 261.7]	225.1	[ 179.3; 282.7]	0.6672 ns
	Hemiptera¹	6.6	[ 5.4; 8.1]	9.3	[ 7.9; 10.9]	8.1	[ 6.8; 9.5]	0.1052 ns
	Hymenoptera	24.8	[ 19.3; 31.8]	31.3	[ 24.5; 40.0]	29.4	[ 22.9; 37.5]	0.3800 ns
	Lepidoptera	3.4	[ 2.4; 4.7]	3.1	[ 2.2; 4.3]	3.4	[ 2.4; 4.6]	0.9082 ns
	Others	40.1	[ 27.0; 59.1]	42.1	[ 28.4; 62.1]	49.8	[ 33.7; 73.4]	0.7067 ns
Beets	Araneae	3.8	[ 3.2; 4.5]	4.1	[ 3.4; 4.8]	4.1	[ 3.5; 4.8]	0.7807 ns
	Coleoptera	31.9	[ 27.6; 36.9]	34.7	[ 30.1; 40.1]	39.2	[ 34.0; 45.3]	0.1357 ns
	Diptera	78.2	[ 61.3; 99.5]	89.0	[ 69.8; 113.2]	93.4	[ 73.3; 118.8]	0.5571 ns
	Hemiptera¹	6.6	[ 5.6; 7.9]	8.4	[ 7.0; 9.9]	8.5	[ 7.2; 10.1]	0.0845 ns
	Hymenoptera	4.3	[ 3.4; 5.4]	4.9	[ 3.8; 6.1]	6.0	[ 4.8; 7.5]	0.1322 ns
	Lepidoptera	15.7	[ 11.1; 22.1]	17.1	[ 12.1; 23.9]	19.3	[ 13.7; 26.9]	0.6931 ns
	Others	19.2	[ 13.7; 26.7]	17.1	[ 12.2; 23.8]	21.2	[ 15.2; 29.5]	0.6443 ns

^{1The dry mass estimates do not include Aphididae. 1The dry mass estimates do not include Aphididae.}