Four Common Insects of Durum Wheat Cultivations in Western Macedonia, Greece

Table 2

General mean of insect individuals (GM), sources of variability analyzed, degrees of freedom (df), and significance level, for the four species: Cephus pygmaeus, Haplodiplosis marginata, Mayetiola destructor, and Chlorops pumilionis.

Species	Source of variability	df	Significance level
Cephus pygmaeus	Year	1	0.66
GM = 0.903	Sampling period	7	0.00001
	Year X Sampling period	7	0.09
Haplodiplosis marginata	Year	1	0.001
GM = 0.985	Sampling period	7	0.00001
	Year X Sampling period	7	0.0001
Mayetiola destructor	Year	1	0.414
GM = 0.703	Sampling period	7	0.00001
	Year X Sampling period	7	0.631
Chlorops pumilionis	Year	1	0.016
GM = 0.334	Sampling period	7	0.00001
	Year X Sampling period	7	0.862