What are the two roads we could travel in our struggle with insects? Which road should we travel? Why

The two roads mentioned by the author are the easy road, which is the road we've employed for a long time, as well as the road that can lead to disaster..... or the raos we should take, that being other natural alternatives.

The choice, after all, is ours to make. If, having endured much, we have at last asserted our ‘right to know’, and if, knowing, we have concluded that we are being asked to take senseless and frightening risks, then we should no longer accept the counsel of those who tell us that we must fill our world with poisonous chemicals; we should look about and see what other course is open to us. A truly extraordinary variety of alternatives to the chemical control of insects is available. Some are already in use and have achieved brilliant success. Others are in the stage of laboratory testing. Still others are little more than ideas in the minds of imaginative scientists, waiting for the opportunity to put them to the test.