Onion Thrips - Utah Pests - Utah State University

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Life history and ecology are well-adapted to onions • Females reproduce asexually (parthenogenesis) • Short generation time (2-3 wk) • High mobility of adults • Rapid development of resistance to insecticides • Life stage survival strategies • Later larval instars are non-feeding & protected (“prepupae” & “pupae”) • Eggs are protected – females insert them into leaf tissue <strong>Thrips</strong> life stages
Adults Eggs, Larvae, & Adults Prepupae & Pupae
Page 1: Egg Diane Alston Entomologist Utah
Page 5 and 6: Examples from 2006 & 07 insecticide
Page 7 and 8: Insecticide efficacy Motile thrips
Page 9 and 10: Insecticide efficacy Adult Western
Page 11 and 12: In 2006: • Success, Carzol, and W
Page 15 and 16: Effect of immobile life stages on p
Page 17 and 18: Insecticide efficacy Thrips Eggs (S
Page 19 and 20: Egg hatch from leaves Egg hatching
Page 21 and 22: er leaf thrips pe hatched t an # of
Page 23 and 24: Eggs are the major contributor to p
Page 27 and 28: Importance of egg survival Influenc
Page 29 and 30: Influence of exclusion (caging) on
Page 31 and 32: Abundance of Immigrating Adults Inf
Page 33 and 34: Egg survival and immigrating adults
Page 35 and 36: Mortality factor (insecticide): •
Page 37: Make onions as tolerant / unattract

Onion Thrips - Utah Pests - Utah State University

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