Research Reports: Resistance of Selected Interspecific Lycopersicon Hybrids to Greenhouse Whitefly (Homoptera: Aleurodidae)

  • W. Alan Erb
  • Richard K. Lindquist
  • N. Jean Flickinger
  • Mildred L. Casey


Lycopersicon interspecific hybrids and species inbreds were examined for resistance to the greenhouse whitefly, Trialeurodes vaporariorum (Westwood) (Homoptera: Aleurodidae), in four separate greenhouse studies. The two L. pennellii Correll interspecific hybrids (ICR.13 X LA1735 and ICR.13 X LA716) were the most toxic and/or repellent to adult whiteflies. ICR.13 X LA1735 exhibited the most adult and nymphal antibiosis and adult antixenosis, supported the lowest number of eggs and nymphs and developed the smallest second generation of adults. The L. esculentum Miller entry (ICR.13) was usually intermediate in all characteristics examined. All the entries in the study were able to support all the whitefly developmental stages which suggests selective pressure could possibly overcome a resistance mechanism based solely on adult antibiosis. This study provides evidence for adult and nymphal antibiosis mediated by trichome exudates and the possibility that a second nymphal antibiosis mechanism is present within the leaves of LA1735.
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