Table 1.

The results of using mixed effect models to predict the maximum abundance of Metopolophium dirhodum on leaves based on its abundance at the time of heading (EE) assessed in dense and sparse plots of wheat

Model terms	Slope	Intercept	L-ratio	df	P
Full modela
Density			82.153	1	<0.001
Heading			3.457	1	0.063
Density by heading			1.518	1	0.218
Simple modelb
Heading	0.454 ± 0.081	0.919 ± 0.121	27.956	1	<0.001
Sparse stands onlyb
Heading	0.115 ± 0.080	0.946 ± 0.148	1.933	1	0.164
Dense stands onlya
Heading	0.382 ± 0.168	0.518 ± 0.131	4.550	1	0.033

^aRandom slope and intercept model (random term: ~1 + EE|year).

^bRandom intercept model (random term: ~1|year).