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Glandular trichomes of Solanum berthaultii alter host preference of the Colorado potato Beetle, Leptinotarsa decemlineata
Author(s) -
Yencho G. Craig,
Tingey Ward M.
Publication year - 1994
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/j.1570-7458.1994.tb00750.x
Subject(s) - leptinotarsa , colorado potato beetle , biology , trichome , host (biology) , pest analysis , botany , solanum , preference , ecology , economics , microeconomics
Choice and no‐choice studies were conducted to determine how the glandular trichomes of the wild potato, Solanum berthaultii Hawkes, affect host preference of the Colorado potato beetle, Leptinotarsa decemlineata (Say). Given a feeding choice between S. tuberosum and S. berthaultii , larvae and adults preferred the foliage of S. tuberosum , but adults were more discriminating. When foliage of S. berthaultii was appressed to S. tuberosum leaflets, fewer adults fed on the appressed leaflets. When given a choice between ‘trichome‐intact’ and ‘trichome‐removed’ S. berthaultii foliage, adults preferred to feed on the latter. The preference for ‘trichome‐removed’ foliage and the percent of adults initiating feeding, increased with the degree of trichome removal. These studies provide evidence that the resistance of S. berthaultii is associated with feeding deterrents localized in the glandular trichomes, that S. berthaultii possesses more than one mechanism of resistance to the Colorado potato beetle, and that the expression of resistance is dependent on the developmental stage of the insect.