Table 3. Plant samples used in this study and a comparison of associated PCR results using specific primer set Mul-15040-F/R developed in this study vs. Xylella fastidiosa-universal primers.

Country	Plant	# of plants	# of PCR (+) using
			X. fastidiosa-specific primers a	Mul-15040-F/R
U. S.	Mulberry	7	5	5
	Sycamore	8	8	0
	Elm	6	6	0
	Pin oak	10	10	0
	Red Oak	15	15	0
Italy	Olive	36	36	36
	Mulberry	10	0	0

^aPlant samples from the U. S. were tested by the primer pair 272-1-int and 272-2-int [30], and those from Italy by RST31 and RST33 [29].