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Study of the odorous constituents of terpenlc exhalations of various essences and of their effect on Ips sexdentatus Boerner



Study of the odorous constituents of terpenlc exhalations of various essences and of their effect on Ips sexdentatus Boerner



C R Hebd Seances Acad Sci Ser D Sci Natur [paris] 264(11): 1471-1474



The behavior of Ips sexdentatus towards various resinous essences was studied with the help of osmopiles, simple galvanic elements which are sensitive to traces of gaseous substances. Experimental infections of the insects have revealed that the maturation nutrition of young adults is optimal on trees whose sap is rich in biochemical constituents (determined refractometrically at 16-20% of dry weight). Under natural conditions the insect supports strong concentrations of volatile constituents of a wide variety of compositions, but its behavior becomes clearly disturbed when placed into an enclosure filled with a single pure atmosphere of a substance such as delta-carene. Following a loss of equilibrium, 72% mortality occurs 65 hr. at 28[degree]C. Only concentrated vapors in an enclosed environment are toxic. A sap blotope rich in glucldlc and terpenic constituents offers optimal conditions for the nutrition of young adults.

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