Performance of Tomicus yunnanensis and Tomicus minor (Col., Scolytinae) on Pinus yunnanensis and Pinus armandii in Yunnan, Southwestern China

Table 1

The performance of Tomicus yunnanensis and T. minor in the caged shoots of Pinus armandii and P. yunnanensis in Kunming. 60 T. yunnanensis adults were released into the 6 shoot cages on July 28, and 30 T. minor adults were released into 3 cages on October 24, for each tree species. The performances of the beetles were checked on December 25, 2000.

Tomicus species	Pinus species	Number of beetles (percentage)
		Total	Alive	Killed by resin	Dead from other reasons	Missing
T. yunnanensis	P. yunnanensis	60	13 (21.7)	1 (1.7)	24 (40.0)	22 (36.6)
	P. armandii	60	7 (11.7)	12 (20.0)	26 (43.3)	15 (25.0)
Chi-square analysis of 2 × 4 contingency table			X^2 = 12.5, d.f. = 3, 𝑃=0.006
T. minor	P. yunnanensis	30	8 (26.7)	1 (3.3)	14 (46.7)	7 (23.3)
	P. armandii	30	4 (13.3)	8 (26.7)	14 (46.7)	4 (13.3)
Chi-square analysis of 2 × 4 contingency table			X^2 = 7.60, d.f. = 3, 𝑃=0.055