Plantation forestry diseases in Zambia: Contributing factors and management options

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Table II

Incidence of leaf blight and stem cankers in Eucalyptus grandis and E. cloeziana at Copperbelt Forestry Company plantations in Kalibu and Kafubu, Copperbelt Province of Zambia^a.

	Incidence of leaf blight (%)^b		Incidence of stem cankers (%)^c

Plot number	Kalibu	Kafubu	Kalibu	Kafubu
Plot 1	1.0	...^d	24.4	1.1
Plot 2	10.0	...	6.9	18.8
Plot 3	2.0	...	37.0	26.7
Plot 4	4.8	...	9.7	11.6
Plot 5	2.8	...	14.7	23.7
Plot 6	2.0	...	11.9	14.7
Plot 7	...	...	3.1	12.0
Plot 8	...	...	5.2	13.7
Average	7.5	...	14.1	15.3
Statistical			***	***
difference^e	...	...	***	***
Prob > F-test	...	...	0.4755 (ns)

Incidence expressed as percentage of trees with leaf blight symptoms over the total number of trees in the plot at Kalibu (E. grandis) and Kafubu (E. cloeziana)

Incidence expressed as percentage of trees with stem cankers over the total number of trees in two quadrants per plot at Kalibu (E. grandis) and Kafubu (E. cloeziana).

Leaf blight symptoms not observed in E. cloeziana plantations at Kafubu.

ns stands for mean values not significantly different from zero at P ≤ 0.05.