Migrating European starlings can eat many times their weight in crop-damaging insects like beetles and corn borers, helping clear farms of these destructive pests for the thirty or so days until the birds continue on to their next destination. No major crop can grow from seed to a harvest-ready mature plant in just thirty days, however. Synthetic pesticides, on the other hand, can be applied again and again as the crop grows and matures. Thus, for growing major crops, the assistance of the starlings cannot play any part in effective pest control.
The argument is most vulnerable to criticism on the grounds that it fails to:
A)Allow for the possibility that other migratory birds might be equally effective in reducing the population of crop-damaging insects
B)Relate to the fact that some synthetic pesticides are much more effective than others
C)Consider the possibility of combining both of the pest-control methods under discussion
D)Consider that there might be minor crops that do mature in less than 30 days
E)Identify any alternative method of pest control in place of the method it rejects