RESPONSE TESTS OF CONE FLIES (STROBILOMYIA SPP.) TO DAHURIAN LARCH CONE VOLATILES1)

Abstract

Several main monoterpenes and their combinations from Dahurian larch (1,ariz gttieliniiRupr. ) cones were used as odor sources in olfactory experiment to test the responses of larch cone flies (Strohilorrryia spp. ) in 1998. The results revealed that blend of a -pinene, / 3 -pinene, laurene and / 3ocimene in a ratio close to its volatile profile of damaged cones achieved the best response while certain odors showed repellent tendency to cone flies. Field spraying Dahurian larch cones with some of its volatile components had mixed results but support the olfactory testing results. The role of monoterpenes in cone fly host location and oviposition in terms of attractive signals or repellent is discussed.

A review of pest surveillance techniques for detecting quarantine pests in Europe

“…A horizontal fluorescent yellow plate, acting as a nutritional (flower)-type stimulus, combined with a vertical plate coloured in fluorescent yellow with purple vertical stripes, mimicking the contrast between cones and foliage, efficiently traps males of the European larch cone flies (Roques, 1986b;Da Ros, 1997;Olenici et al, 2001). Sexually immature females of six Asian species of larch and spruce cone flies are trapped in signficant numbers by deep blue cups hanging upside down about 2 m above ground level (Roques et al, 1995;Yan et al, 1997Yan et al, , 2002. Blue cups are similarly efficient in trapping immature females of a North American larch cone fly, S. laricis (Chau, 1993) as well as European larch cone flies (Roques, unpublished data).…”

“…Blue cups are similarly efficient in trapping immature females of a North American larch cone fly, S. laricis (Chau, 1993) as well as European larch cone flies (Roques, unpublished data). Baiting visual traps with monoterpene blends extracted from healthy cones may increase specificity in captures, but the results are not yet conclusive (Yan et al, 1999). Because of the lack of specificity of visual traps, genitalia dissection must be used systematically for the accurate identification of trapped flies (Michelsen, 1988;Roques et al, 2003).…”

“…Visual traps have been used in monitoring programmes in Europe (Jenkins & Roques, 1993;Olenici et al, 2001), North-Eastern China (Roques et al, 1995;Yan et al, 1997) and Canada (Chau, 1993). Models have been developed for larch stands in Europe to estimate the level of cone damage to be expected for different cone crop sizes with regard to the number of flies trapped by a set of horizontal and vertical traps (Roques, unpublished data).…”

“…Mature flies locate the host cones during the day, using a combination of visual and olfactory cues (Roques, 1986a). This behaviour has enabled the development of a number of detection and monitoring techniques in Europe, China and North America (Roques, 1986b;Yao et al, 1991;Chau, 1993;Roques et al, 1996;Yan et al, 1997Yan et al, , 1999Yan et al, , 2002.…”

Attraction of the Gypsy Moth to Volatile Organic Compounds (VOCs) of Damaged Dahurian Larch

“…Five different VOCs from L. gmelinii foliage damaged by the moth larvae (Guo et al, 1996;Yan, 1999) were used to set up the lures. In Lure I, fi ve different VOCs (α-pinene, 1S-β-pinene, camphene, 3-carene, and 1-hexanol, see Table I) were placed in fi ve different polyethylene bottles (Pherobio Tech, Beijing, China).…”