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Table 4 Analysis of variance of the effect of dendrometrical and health tree status parameters on the abundance of bark beetles (number of insects/m2) in silver firs (N = 48) on Mont-Ventoux, France

From: Individual vulnerability factors of Silver fir (Abies alba Mill.) to parasitism by two contrasting biotic agents: mistletoe (Viscum album L. ssp. abietis) and bark beetles (Coleoptera: Curculionidae: Scolytinae) during a decline process

 

Dendrometrical parameters

Health status parameters

 

Branch diameter

 

Branch size

 

% Needle chlorosis

 

% Defoliation

 

F

p

 

F

p

 

F

p

 

F

p

 

High branch

7.67

0.00818

**

4.33

0.0431

*

0.254

0.617

NS

0.022

0.883

NS

Low branch

0.00150

0.969

NS

0.396

0.533

NS

25.2

<0.001

***

32.7

<0.001

***

  1. ddl = 1; NS non significant
  2. *p < 0.05, **p < 0.01, ***p < 0.001
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Annals of Forest Science

ISSN: 1297-966X