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Liriomyza trifolii (Burgess), the American serpentine leafminer fly, is a well-known serious pest in the world. This insect species attacks plants of more than 21 families including Solanaceae plants. A sweet pepper, Capsicum annuum (Solanaceae), on mature stage, however, shows resistance to this leafminer fly. This resistance is based on the ovipositional deterrent in the sweet pepper leaf against the fly species. Based on the bioassay guided fractionation, phytol [(2E)-3,7,11,15-tetramethyl-2-hexadecen-1-ol] was isolated and identified as an ovipositional deterrent against this insect species. The yield of this compound was 815 µg/g fresh leaf of C. annuum. This compound completely deterred the females from laying their eggs on host plant leaves treated at 35.2 µg/cm 2 .

Hordatines A and B, strong antifungal components in shoots of barley seedlings, were found to occur in a barley chromosome 2H addition line to wheat, but not in a wheat line carrying the long arm of chromosome 2H. These results showed that some genes that encode hordatine biosynthetic enzymes are located on the short arm of chromosome 2H. The total content of the hordatines was about six fold less than that in the parental barley, but was still at a concentration more than 20-fold higher than that required for inhibition of spore germination of pathogenic fungi.