Table 2.

Ct values of DNA standards after qPCR with the universal phytoplasma- and ‘Ca. P. ulmi’-specific spacer qPCR assay

Copy number/assay	Universal phytoplasma assaya	‘Ca. P. ulmi’-specific spacer assaya
1008	19.7	21.6
1007	21.4	23.2
1006	22.5	24.3
1005	25.7	27.1
1004	30.0	30.4
1003	31.3	32.0
1002	34.5	35.4
1001	37.2	35.1

^a, Mean of four technical replicates including DNA from a non-infected elm tree