STUDIES ON THE CEREAL ECOSYSTEM
143
TABLE IX
Percentage composition of the Diptera in a a m p h from herbicide
treated cereals, Weat Swam, 1970 and 1971
June 1970
June 1971
NEMATOCERA
Tipulidae
Trichoceridae
Psychodidae
Scatopsidae
Cecidomyidae
Bibionidae
Mycetophilidae
Chironomidae
BRACHYCERA
Rhagionidas
Tabanidae
Adidae
Empididas
Dolichopodidae
CYCLORRHILPHA
Lonchopteridae
Phoridaa
Syrphidae
Agromyzidae
Sepsidae
Lauxanidae
Opomyzidae
Drosophilidae
Sphaeroceridae
Ephydridae
Chloropidae
Calliphoridae
Tachinidae
Mu s c i d ae
Scatophagidae
Sample size
0.2 1
0-03
0-32
0.00
42.29
0.00
9.78
2-11
0.00
0.03
0.00
6.08
2-85
3.09
1.27
0.16
4.94
1.63
2.17
1.80
1.90
4-92
3.94
9.62
0.03
0.06
0.79
0.18
3783
0.36
0.02
0.13
0.02
7.16
0.07
7.89
1.11
0.02
0.03
0-02
12-63
2.63
19.62
0.34
0.29
6.07
0.69
3.79
1.70
19.69
6.71
3.42
3.00
0.37
0-06
1.06
2.21
6931
with the vacuum insect net from fields of spring and winter barley,
winter wheat and oats, in early-mid June.
In 1970 the Diptera were characterized by a predominance of
Cecidomyidae (42.29%). Other families of importance were the
Mycetophilidae (9.78%), Chloropidae (9.52%) and the Empididae
(6.8%). In contrast, in 1971 the most important representatives of the