Table 1. Summary of Empoasca fabae arrival and severity data across continental United States compiled for the study.

State	Arrival data sample size	Mean arrival day ± SD	Arrival data year range	Severity data sample size	Mean severity ± SD	Severity data year range
Illinois	24	122 ± 13.9	1952–1997	14	2.7 ± 1.1	1952–1992
Illinois (>1997)	7	150 ± 14.0	2004–2012	-	-	-
Indiana	9	129 ± 17.8	1952–1992	5	3.2 ± 1.1	1952–1992
Iowa	7	136 ± 12.6	1952–1992	3	4 ± 1.0	1953–1992
Kansas	4	142 ± 10.3	1952–1956	3	1.7 ± 0.6	1954–1956
Kentucky	17	125 ± 7.4	1980–1997	12	1.8 ± 1.1	1981–1992
Maryland	33	134 ± 13.3	1955–2012	18	3.3 ± 0.9	1955–1997
Massachusetts	16	165 ± 8.2	1991–2012	-	-	-
Michigan	29	140 ± 13.5	1953–2003	19	2.7 ± 1.1	1954–1997
Minnesota	31	146 ± 11.8	1952–2011	19	2.6 ± 1.2	1952–1997
Missouri	18	129 ± 13.0	1952–1995	14	2.3 ± 1.2	1953–1997
Nebraska	12	133 ± 121.3	1952–1989	9	2.8 ± 1.3	1952–1988
New York	11	153 ± 13.3	1953–1992	7	2.7 ± 1.7	1953–1992
North Dakota	9	159 ± 18.0	1953–1961	7	2.4 ± 1.1	1955–1961
Ohio	23	134 ± 11.4	1952–1997	14	2.6 ± 1.3	1952–1992
Oklahoma	23	129 ± 13.9	1952–1997	21	1.3 ± 0.5	1954–1997
Pennsylvania	6	141 ± 9.0	1955–1992	5	1.4 ± 0.5	1955–1992
Pennsylvania (>1997)	8	160 ± 10.1	1997–2012	-	-	-
South Dakota	7	155 ± 13.6	1952–1960	7	2.3 ± 1.0	1952–1960
Virginia	6	125 ± 14.0	1953–1992	5	3.4 ± 0.9	1953–1992
Wisconsin	42	133 ± 12.0	1951–2012	14	2.9 ± 0.9	1951–1992

The mean values provided are Julian day of arrival and severity of infestation on a scale of (1 = low to 5 = high) and States are arranged alphabetically.