Table 1.

Effect of microinjection of imidacloprid (10%) on hemlock woolly adelgids.

	HWA mortality injected	HWA mortality noninjected	HWA viable injected	HWA viable noninjected
	97.44	66.59	0.83	19.25
	93.11	49.14	2.20	50.25
	97.71	33.25	1.83	55.50
	99.21	28.79	0.25	53.25
	79.35	27.66	18.29	63.50
	73.85	44.50	21.43	45.60
	90.05	47.21	4.38	44.00
	78.75	64.59	22.63	18.00
	94.46	49.55	5.33	42.75
	76.02	38.38	12.00	23.25
	68.55	18.28	27.50	49.00
	93.53	30.68	2.00	56.00
	72.99	29.07	23.25	30.25
	95.98	54.49	4.67	23.20
	98.21	61.82	0.29	28.33
	100.00	31.51	0.00	56.33
	96.56	24.66	1.43	66.00
	97.68	20.22	2.00	69.00
	65.40	33.49	25.10	48.50
	58.60	14.90	38.67	78.25
	68.64	12.02	20.29	81.67
	83.02	61.47	9.67	48.33
	85.98	19.81	11.70	74.33
	76.28	23.45	11.00	68.50
Mean	85.06^*	36.89	11.11^*	49.71

↵* Significantly different mean values observed on hemlock woolly adelgids mortality and viability in imidacloprid injected and noninjected trees (mean of 24 trees). Paired t-test values are significant at P = 0.05% level.