Table 3.

Number of samples listed by Ct categories obtained with the universal phytoplasma- and specific qPCR assays

qPCR Assays and elm species	Ct Category a				Sum of rows
	>  28 ≤ 34	>  22 ≤ 28	>  18 ≤ 22	≤ 18
Universal phytoplasma assay
U. glabra	66	314	271	100	751
U. laevis	103	465	90	7	665
U. minor	74	196	103	14	387
Sum of columns	243	975	464	121	1803
‘Ca. P. ulmi’-specific assay
U. glabra	105	514	127	4	750
U. laevis	240	412	11	1	664
U. minor	130	235	22	–	387
Sum of columns	474	1161	160	5	1801

^a, Columns refer to Ct categories and the associated number of positive samples