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lecture 18 - Combined Life Cycles Spider mites Aphids...

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Combined Life Cycles Spider mites Aphids
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Parthenogenesis (often combined with sex) Thelytoky: unfertilized eggs develop into female adults Arrenotoky : unfertilized eggs develop into male adults
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Tetranychus urticae Two-spotted spider mite (Acari) Egg to adult development in 5 days at temperature >30 C Hundreds of species of host plants High density of mites leads to colonization of new plants
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Colonization Strategy Ballooning to move Single unmated female on a plant Produces eggs that develop into males Eggs hatch and develop New adult males mate with mother Originator of colony then produces eggs that are female (fertilized) and male (unfertilized)
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Alternating Strategy: Soybean Aphid Heteroecious: alternates between more than one host plant in an annual cycle Holocyclic: has sexual reproduction in part of the annual life cycle Important pest of soybean in midwestern US Soybean summer host (Secondary host) Buckthorn winter host (Primary host)
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