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Choice bioassays were used to determine repellency of homologous n-alkanes (C8H18–C21H44) to spider mites. When tested at 400 μg/cm2, the C15–C19 alkanes were highly repellent; the C16 n-alkane, n-hexadecane, was most repellent. Subsequently the EC50 values, the concentration at which 50% of the mites were repelled, were determined for the C15–C19 n-alkanes and their analogous 1-n-alkenes (C15H30–C...
The sesquiterpenoid spidermite repellent, 2,3-dihydrofarnesoic acid, occurs in trichome secretions of LA1363, an accession of the wild tomato Lycopersicon hirsutum. To better understand the inheritance of this sesquiterpene acid and its relationship with the quantity trichome secretions, interspecific crosses were made with five inbred lines of L. esculentum. Limited seed set and frequent seedling...
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