rmahe11
Wont D weaken the argument , since more than 50 percent of nematodes emerge from the cyst ? as it says (9/10 th)
The idea here is that if lots of nematodes emerge, but there aren't any potato crops for them to eat, that's a good thing! Think about the sequence from the farmer's perspective:
1. Sprinkle chemicals where there are no potatoes
2. Watch hungry, confused nematodes emerge from the ground and starve because, oops, there are no potatoes to eat!
3. Plant your potato crop and laugh like a maniac, since basically all the nematodes are already dead
Put another way, the whole problem is that the nematodes, in the past, were coming out in response to the presence of potatoes. If they come out when potatoes are absent, they can't do any damage to what's
not there.
I hope that clears things up!