Íslenskar landbúnaðarrannsóknir - 01.09.1981, Side 66

64 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
interruptus ancl Cheyletus eruditus are their
predators.
The above species are, according to
their numbers and frequencies, the most
prominent members of the hay mite com-
munity, while those from the low fre-
quency group (table 2, 6—19) are ac-
cidental memers. Thus the species of
Cryptostigmata spp., Bryobia praetiosa,
Tyrophagus similis, Eriophyidae sp., Steneo-
tarsonemus sp. Stigmaeus sp. and Pygmephorus
islandicus are carried from the home hay-
field and hardly multiply in stored hay.
Suidasia sp. has been found in stored pro-
ducts (Hughes 1976), mainly in products
with a high protein content. Phorytocarpais
fimetorum (det. Athias-Henriot), Andro-
laelaps casalis, Haemogamasus pontiger and
Digamasellus presepum are predators of ac-
arid mites while Ctenoglyphus plumiger and
Kleemannia plumigera are fungivorous.
Other animals of stored hay
Collembola are normally confmed to sur-
faces with a stable humidity similar to that
of the soil and appear to be að contamina-
tion from the soil underneath the hay
stores.
Book lice (Psocoptera) were absent in
all samples.
The Coleoptera of the samples (K. Ar-
evad det.): In H4 & A7 single larvae of
TABLE 2.
Mite species identified from 36 samples of stored hay in Iceland.
Mites of the high frequency group
% numbers frequency %
1. Tarsonemus sp. (undescribed) ......................................... 33.5 97
2. Acarusfarris (Oudemans) .............................................. 30.4 81
3. Lepidogtyphus destructor (Schrank) ................................... 25.7 83
4. Tydeus interruptus Thor ............................................... 6.3 78
5. Cheyletus eruditus (Schrank) .......................................... 0.8 50
1—5 combined ........................................... 96.7 100
Mites of the low frequency group
occurred in frequency %
6. Ctenoglyphus plumiger (Koch) ....................... L4, A2, A9, A10
7. Phorytocarpaisfimetorum (Berlese) .................. K4, K5, K6, K7
8. Cryptostigmata spp.................................. Ll, L7, K2, K3
9. Androlaelaps casatis (Berlese) ..................... H4, A3, A5
10. Kleemannia plumigera Oudemans ..................... A8, A9, E2
11. Bryobia praetiosa (Koch) .......................... L5, K4, A4
12. Haemogamasus pontiger Berlese ..................... L4, A5
13. Tyrophagus similis Volgin ......................... K4, K5
14. Pygmephorus islandicus Sellnick ................... K5, E2
15. Digamasellus presepum Berlese ........................................ H4
16. Steneotarsonemus sp................................................... L6
17. Eriophyidae sp........................................................ A3
18. Suidasia sp........................................................... L7
19. Stigmaeus sp.......................................................... H4
6—19 combined .......................................... 3.3% of specimens
11
1 1
11
8
8
8
6
6
6
3
3
3
3
3
60