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

Table 2

Amounts of monoterpene hydrocarbons in phloem samples (15–25 mg dry weight) from five species of pine (near Bass Lake, California, USA, 17 October 1986).

Monoterpene hydrocarbons (μg) per g phloem (dry weight)
Pine species	α-pinene mean ± SD (range)	β-pinene mean ± SD (range)	Myrcene mean ± SD (range)	3-Carene mean ± SD (range)	Limonene mean ± SD (range)
Ponderosa	1076±1904	1179±1921	428±338	2747±2483	2345±3997
𝑁=4^1	(<20–3930)	(<50–4060)	(<50–1015)	(237–6750)	(<50–8335)
Sugar	395±378	180±224	54±55	121±145	<15
𝑁=4	(97–1015)	(425–577)	(<15–131)	(<15–307)	(<15)
Jeffrey	1665±1612	1216±1692	272±291	1924±1563	4410±3673
𝑁=4	(601–3520)	(124–3165)	(75–606)	(283–3395)	(1105–8365)
Gray	<20	<20	<20	<20	<20
𝑁=4	(<20)	(<20)	(<20)	(<20)	(<20)
Lodgepole	1400±1811	3261±4595	780±1034	2413±3096	14284±14566
𝑁=4	(<25–4060)	(<25–10075)	(<25–2300)	(98–6965)	(1095–35000)

¹Number of trees.