Table 2 The clone corrected mating type frequencies and their homogeneity tests in 17 the field populations of A. alternata sampled from China between 2011 and 2013.

Population	Year	Cropping region	Sample size	Frequencies		χ² test (p-value)
Population	Year	Cropping region	Sample size	MAT1-1	MAT1-2	Within fields	Among fields
Changde	2012	CDR	23	0.39	0.61	0.40
Jinan	2012	CDR	50	0.42	0.58	0.32
Kaifeng	2012	CDR	50	0.40	0.60	0.20
Suizhou	2012	CDR	37	0.30	0.70	0.02 ^*
Chifeng	2012	NSR	52	0.50	0.50	0.89
Datong	2013	NSR	17	0.35	0.65	0.33
Harbin	2012	NSR	48	0.46	0.54	0.67
Lü´liang	2013	NSR	7	0.57	0.43	1.00
Shuangcheng	2012	NSR	35	0.40	0.60	0.31
Wulanchabu	2012	NSR	16	0.37	0.63	0.45
Xinzhou	2013	NSR	10	0.50	0.50	0.75
Zhangjiakou	2012	NSR	47	0.49	0.51	1.00
Kunming1	2011	SMR	51	0.55	0.45	0.58
Kunming2	2012	SMR	5	0.60	0.40	1.00
Qujing	2011	SMR	8	0.50	0.50	0.72
Changle	2011	SWR	8	0.63	0.37	0.72
Fuzhou	2011	SWR	32	0.56	0.44	0.60	0.72

The hypothesis of 1:1 ratio between MAT1-1 and MAT1-2 within a field population was evaluated evaluaed by a simple χ² test and heterogeneity in mating type frequencies among field populations and regional populations was evaluated by a contingency χ² test.

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