Identification of extracted compounds of female Lygus lucorum
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Key Words：Lygus lucorum, extract compounds, GC-MS, (E)-2-hexenyl butyrate
Abstract： Semiochemicals extracted from virgin females of the green leaf bug, Lygus lucorum Meyer-dür, were analyzed by GC-MS. The volatiles extracted comprised ten compounds identified as esters, alcohols and acids. Among the compounds identified, (E)-2-hexenyl butyrate (E)-2-henenol, butyric acid, hexyl butyrate, and (Z)-3-henenol were the major components. Three compounds, hexyl butyrate, (E)-2-hexenyl butyrate and (E)-2-henenol significantly decreased with increased female calling activity. The fact the amount of (E)-2-hexenyl butyrate decreased from 7 200 ng per insect to 250 ng indicated that a large amount of (E)-2-hexenyl butyrate was emitted into the ambient air by females. Comparing the content of (E)-2-hexenyl butyrate in extracts from different parts of females, 89.75% was found in the thorax together with (E)-2-henenol. We suggest that (E)-2-hexenyl butyrate is a component of the sex pheromone of female L. lucorum that is secreted by a gland, or glands, in the thorax.