Table 2.

The binomial generalized linear model (GLM)’s evaluation of the effects of different variables on the parasitism rate (2017: n = 3784; 2018: n = 3053).

	Source	Df	Wald Chi-Square	p
2017	Intercept	1	296.93	<0.001
	Gall type (Simple, Compound)	1	0.88	0.349
	Chestnut field	2	162.75	<0.001
	Date	1	296.78	<0.001
	Collection site	4	2.49	0.647
2018	Intercept	1	244.93	<0.001
	Gall type (Simple, Compound)	1	0.87	0.350
	Chestnut Field	2	21.68	<0.001
	Date	1	244.98	<0.001
	Collection site	3	4.22	0.239