Table 1. Repeated measures ANOVA (at 95% confidence intervals) results for the effects of blocks, cages, sampling dates and combination of cages and dates on the population density of cotton aphid in cotton cages field study during 2011, 2012 and 2013 at Langfang experimental station (Yellow River Region of China).

Sampling seasons
Factor	2011			2012			2013
	df	F	P	df	F	P	df	F	P
Block	2,10	1.37	0.299	2,10	0.34	0.719	2,10	3.72	0.062
Cage	2,10	0.60	0.552	2,10	52.14	<0.001	2,10	15.22	0.009
Date	10,50	61.36	<0.001	11,55	74.35	<0.001	11,55	62.76	<0.001
Cage × date	20,100	3.83	<0.001	22,110	1013	<0.001	22,110	7.65	<0.001