ATTRACTANCY AND OVIPOSITIONAL RESPONSE OF ADULT BEMISIA-ARGENTIFOLII (HOMOPTERA, ALEYRODIDAE) TO TYPE-IV TRICHOME DENSITY ON LEAVES OF LYCOPERSICON-HIRSUTUM GROWN IN 3 DAY-LENGTH REGIMES

Clonal plants of six accessions of Lycopersicon hirsutum Humb. and Bon pl., a wild relative of tomato, were grown in three day-length regimes . Clones of an accession grown in different day-length regimes were ge netically identical but differed in density of type IV and type VI tri chomes on their leaves. Leaves on these plants were then evaluated for resistance to whiteflies (Bemisia argentifolii Bellows and Perring) i n choice and non-choice bioassays. Plants grown under short days had e levated type IV density, reduced type VI trichome density, and were le ss attractive to whiteflies. Correlation and covariance analysis suppo rted the hypothesis that high type IV trichome density resulted in red uced attractancy, especially on plants grown under short days.