Assertion: yam's cultivation | /r/HasProperty | constrained by ulluco weevil
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Source sentences:
text: Cultivation is also constrained by the Andean potato weevil (Premnotrypes spp), ulluco weevil (Cylydrorhinus spp), and oca weevil, the identification of which remains uncertain (possibly Adioristidius, Mycrotrypes, or Premnotrypes).