Lecture 18 - Combined Life Cycles • Spider mites • Aphids Parthenogenesis(often combined with sex • Thelytoky unfertilized eggs develop into

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Unformatted text preview: Combined Life Cycles • Spider mites • Aphids Parthenogenesis (often combined with sex) • Thelytoky: unfertilized eggs develop into female adults • Arrenotoky : unfertilized eggs develop into male adults 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 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) 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) The Life Cycle...
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This note was uploaded on 02/27/2010 for the course ENTOMOLOGY ent 104 taught by Professor Edwinlewis during the Spring '10 term at UC Davis.

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Lecture 18 - Combined Life Cycles • Spider mites • Aphids Parthenogenesis(often combined with sex • Thelytoky unfertilized eggs develop into

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