Generalized linear mixed model fit by maximum likelihood
  (Laplace Approximation) [glmerMod]
 Family: poisson  ( log )
Formula: 
Activity ~ TreatmentAge + FieldSeason + Lepidoptera + (1 | Site)
   Data: df

     AIC      BIC   logLik deviance df.resid 
   545.2    557.3   -267.6    535.2       78 

Scaled residuals: 
    Min      1Q  Median      3Q     Max 
-3.9584 -0.9273 -0.6179  0.5790  8.3262 

Random effects:
 Groups Name        Variance Std.Dev.
 Site   (Intercept) 1.269    1.127   
Number of obs: 83, groups:  Site, 26

Fixed effects:
              Estimate Std. Error z value Pr(>|z|)    
(Intercept)  -0.398290   0.001621  -245.7   <2e-16 ***
TreatmentAge -0.691213   0.001621  -426.5   <2e-16 ***
FieldSeason   0.498549   0.001621   307.5   <2e-16 ***
Lepidoptera  -0.466337   0.001620  -287.8   <2e-16 ***
---
Signif. codes:  
0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Correlation of Fixed Effects:
            (Intr) TrtmnA FldSsn
TreatmentAg 0.000               
FieldSeason 0.001  0.000        
Lepidoptera 0.000  0.000  0.000 
convergence code: 0
Model failed to converge with max|grad| = 0.0433679 (tol = 0.001, component 1)