Host-Tree Monoterpenes and Biosynthesis of Aggregation Pheromones in the Bark Beetle Ips paraconfusus

Table 3

Amounts of monoterpene hydrocarbons in oleoresin samples from four species of pine (near Bass Lake, California, USA, 17 October 1986).

Monoterpene hydrocarbons (μg) per μL oleoresin
Pine species	α-pinene	β-pinene	Myrcene	3-Carene	Limonene	Monoterpene Percent of Oleoresin
Ponderosa^1	43.5±6.4	102.6±14.3	120.5±19.6	498.5±79.2	70.0±12.7	83.5
Jeffrey	1.32	1.00	3.37	16.35	6.93	2.9
Gray	0.68	<0.06	<0.06	<0.06	<0.06	0.08
Lodgepole	43.2	39.7	23.7	69.5	723.0	89.9

¹Four samples from cardinal directions of one tree, mean ± SD.