| Summary: | 碩士 === 國立屏東科技大學 === 熱帶農業研究所 === 89 === Preference of Helicoverpa armigera on tomato and S. viarum, was determined by using an I-tube bioassay. The results showed that H. armigera adults overwhelmingly preferred to lay eggs on S. viarum over its normal host of tomato plant. H. armigera larvae preferred S. viarum foliage over tomato fruit or tomato leaves, although larval development on S. viarum foliage was retarded.
Substantial differences were found in certain morphological characteristic of S. viarum and tomato leaves. Leaves of S. viarum were larger and thicker than those of tomato. The morphology of trichomes on S. viarum was radically different than that on tomato. The abundance of glandular trichomes on S. viarum leaf surface was, in a descending order, gland tipped finger trichomes > multicellular trichomes > stellate trichomes. The abundance of nonglandular trichomes on S. viarum leaf surface was in a descending order, finger trichomes > branchlet > stellate trichomes.
Microwave-assisted hexane extract of S. viarum leaves and hexane extract of volatiles collected from S. viarum plant attracted H. armigera adults for oviposition on extract coated filter paper. Influence of plant volatiles from S. viarim on mating indicated that the mating was successful only when S. viarum extract was used. The most abundant components from S. viarum leaves extract using microwave assisted extraction were 3-nitro-1.2-benzenedicarboxylic acid, 5-butyldihydro-2 (3H)-furanone and bis (2-ethylhexyl) phthalate.
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