250 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Aa-C23 inclusive were found to be congenial to Crataegus forms in the 
Ca-C tests (Table III). Under “remarks” is given the number of 
these seedlings in the Ca-C tests of Table III. 
Table IV 
Exp. No. 
Duration of 
Experiment 
Transfers 
Results 
Remarks 
No. 
Total Aphids 
Applied 
Aa-C2. 
6/15-7/12 
10 
50 
None established 
Aa-C3. 
6/15-7/12 
12 
60 
None established 
Aa-C4. 
6/15-7/12 
12 
60 
None established 
Aa-C5. 
6/15-7/12 
13 
65 
None established 
Aa-C6. 
6/15-7/12 
11 
55 
None established 
Aa-C7. 
7/13-7/26 
10 
50 
None established 
Aa-C8. 
7 13-7/26 
10 
50 
None established 
Aa-C9. 
7/13-7/26 
11 
55 
None established 
Aa-CIO. 
7/13-7/26 
10 
50 
None established 
Aa-Ci 1. 
7/13-7/26 
11 
55 
None established 
Aa-C12. 
7/20-7/31 
10 
50 
None established 
Aa-C13. 
7/20-7/31 
10 
50 
None established 
Aa-C14. 
7/20-7/31 
10 
50 
None established 
Aa-C15. 
7/20-7/31 
10 
50 
None established 
Aa-C16. 
7/20-7/31 
10 
50 
None established 
Aa-Cl7. 
7/31-8/14 
18 
83 
None established 
Was Ca-C3 
Aa-C18. 
8/6-8/23 
4 
20 
Colony 
Was Ca-C8 
Aa-C19. 
8/15-9/14 
13 
65 
N one established 
Was Ca-C 18 
Aa-C20. 
8/15-11/15 
1 
5 
Colony 
Was Ca-C20 
Aa-C21. 
9/14-10/5 
2 
25 
None established 
Was Ca-C24 
Aa-C22. 
10/5-10/13 
1 
20 
None established 
Was Ca-C25 
Aa-C23. 
10/15-11/14 
2 
35 
8 established 
Was Ca-Cl 
It should be stated in the case of Aa-C23, which was Ca-Cl of Table 
III, that it was brought into the tests at a time when it was beginning 
to shed its leaves. Aphids established on it and produced young^ 
though the latter did not establish. When the latter were born prac¬ 
tically all the leaves had been shed and the tissues are bound to have 
hardened. 
Further trials were made by attempting to establish apterous vivi- 
parise from Crataegus on apple with the results indicated in Table V. 
Table V 
Duration of 
Experiment 
Transfers 
Exp. No. 
No. 
Total Aphids 
Applied 
Results 
Ca-Al. 
7/16-9/14 
8/2-9/14 
8/2-11/1 
8/2-9/14 
8/2-11/1 
10/15-11/1 
' 18 
88 
None established 
Ca-A2. 
12 
60 
None established 
Ca-A3. 
13 
65 
Colony 
None established 
Ca-A4. 
18 
90 
Ca-A5. 
14 
66 
Colony 
None established 
Ca-A6. 
2 
3 
The apple seedlings used in the tests given in Table V were tested 
and found to be congenial to apple aphids. 
