South Africa 
if the nicandra is growing in a field, can it be dangerous to the actual crop that is planted? if yes, how can you control it?
On plant
Nicandra
26 Feb, 2010
Answers
I have checked this on Wiki. Whilst it isn't going to hurt the crop Nicandra is part of the solanum family and all parts, including the seed, are poisonous. If the field crop is a root then there shouldn't be too much of a problem but if the crop is a leaf or seed crop then the grower would have to be careful at harvest time.
Overall, it would probably be better to remove the Nicandra from the field, but I don't know how.
26 Feb, 2010
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Meanie
It isn't going to affect the growing crop
26 Feb, 2010