Table 1. ITS sequence information.
Sequences determined during this study			Most similar sequences in the NCBI GenBank database
Sample ID	Location	GenBank accession	GenBank accession	Host tree/sample source	Country (if known)	Fungal species	BlastN identity (query cover)
Akaa5 1	Akaa	KY927826	DQ313554	Tilia cordata	Novgorod, Russia	Apiognomonia errabunda	100% (100%; 501/501)
2C2 2	Kiikala	KY927827	AJ293871	Quercus sp.	unpublished	Fusicoccum quercus	100% (100%; 501/501)
3C2V 2		KY927828
4B1 2		KY927829
4C1 2		KY927830
5C1 2		KY927831
5C2 2		KY927832
Akaa4 1	Akaa	KY927822	DQ313524	Chamaenerion angustifolium	Switzerland	Apiognomonia errabunda	100% (100%; 501/501)
Aul3 1	Hämeenlinna	KY927821	AY853204	Quercus sp.	Netherlands	Fusicoccum quercus	100% (100%; 501/501)
4D2 2	Kiikala	KY927823	AJ293872	Quercus sp.	unpublished	Fusicoccum quercus	100% (100%; 501/501)
5B1 2		KY927824	AJ293873	Quercus sp.	unpublished	Fusicoccum quercus	100% (100%; 501/501)
4C2 2		KY927825	AJ293874	Quercus sp.	unpublished	Fusicoccum quercus	100% (100%; 501/501)
			FJ820749	Air sample	Germany	Uncultured fungus	100% (100%; 501/501)
5A1 2	Kiikala	KY927820	DQ313524	Chamaenerion angustifolium	Switzerland	Apiognomonia errabunda	99% (100%; 501/502)
1C2 2,3	Kiikala	KY927833	KT896641	Ips typographus	Finland	Monilinia sp.	99% (92%; 442/443)
1D2 2,3	Kiikala	KY927834	KF859919	Canadian National Mycological Herbarium (DAOM 166439)	unpublished	Botrytis cinerea	100% (100%; 487/487)
4B2 2,3	Kiikala	KY927835	LN850753	Capsicum annuum	Cuba	Cladosporium sp.	100% (100%; 491/491)
1 Direct PCR product from leaf petiole 2 Cultured isolate. The first number of the sample code corresponds to the leaf petiole treatment used (1–5) 3 Sequence determined in one direction only