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Pyrethrum
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===Companion planting=== A pheromone produced by these plants attracts ladybug beetles, and at the same time acts as an alarm signal to aphids.<ref>{{cite journal |last1=Li |first1=Jinjin |last2=Hu |first2=Hao |last3=Mao |first3=Jing |last4=Yu |first4=Lu |last5=Stoopen |first5=Geert |last6=Wang |first6=Manqun |last7=Mumm |first7=Roland |last8=Ruijter |first8=Norbert C. A. |last9=Dicke |first9=Marcel |last10=Jongsma |first10=Maarten A. |last11=Wang |first11=Caiyun |title=Defense of pyrethrum flowers: repelling herbivores and recruiting carnivores by producing aphid alarm pheromone |journal=New Phytologist |date=August 2019 |volume=223 |issue=3 |pages=1607β1620 |doi=10.1111/nph.15869|pmid=31087371 |pmc=6772172 |bibcode=2019NewPh.223.1607L }}</ref>
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