Population genetics of the cereal cyst nematode Heterodera avenae reveal geographical segregation and host adaptation

Table 1 Occurrence and distribution of Heterodera avenae in the main cereal crop production areas of China

Order	Province (Autonomous region)	Samples	Number of samples containing H. avenae	H. avenae detection rate (%)	Populations density (Cysts per 100 ml soil)
Order	Province (Autonomous region)	Samples	Number of samples containing H. avenae	H. avenae detection rate (%)	Maximum	Average
1	Anhui	84	36	42.67	137	4.88
2	Jiangsu	47	4	7.84	13	0.25
3	Shandong	83	38	45.79	58	7.27
4	Gansu	50	16	32.00	98	13.71
5	Henan	135	108	79.04	292	50.94
6	Hebei	104	84	80.86	569	33.69
7	Qinghai	122	53	43.50	387	22.42
8	Ningxia	45	21	46.15	42	2.96
9	Tianjin	23	23	100	138	25.21
10	Hubei	15	9	61.54	33	11.02
11	Shanxi	20	16	80.00	184	21.2
12	Shaanxi	15	7	45.45	65	20.27
13	Beijing	8	5	66.67	38	14.33
14	Chongqing	2	0	0	0	0
15	Inner Mongolia	64	41	64.06	59	4.34
16	Xinjiang	4	2	50.00	10	3
	Total	821	463	56.39	569	19.08