Seasonal Effects on Wound Susceptibility and Canker Expansion in Honeylocusts Inoculated with Thyronectria austro-americana

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Figure 1.
Average canker size on honeylocusts inoculated with T. austro-americana during three monthswithin a season. Half the trees were partially girdled. Means with a different letter indicate a statistically significant difference (P=0.05) among means within girdled treatments and within a year (LSD= 3.0). *Indicates a significant difference (P=0.05) between cankers on girdled and nongirdled trees within season and year (LSD= 2.6).
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Figure 2.
Average canker size on honeylocusts inoculated with T. austro-americana 0-21 days after wounding in three seasons in 1986 and 1987. Canker means with a different letter indicate a significant difference in means among those inoculated 0, 7, 14, and 21 days after wounding within a season. Based on a LSD of 3.1 (P=0.05). *Indicates a significant difference between controls and inoculated wound size. Based on LSD of 3.6 (P=0.05).

Table 1.

Number of months between inoculation and maximum canker size on honeylocusts inoculated with Thyronectria austro-americana in different seasons.

Months to maximum canker size^{^a}
Year	Girdled^{^b}	Fall	Winter	Spring	Summer
1983-84	+	0.3 ±0.6	9.3 ±0.6	4.3 ± 1.5	8.0 ±0.0
	-	9.0 ±0.0	8.0 ±0.0	3.7 ±0.6	7.3 ±0.6
1984-85	+	8.3 ±0.6	4.7 ± 1.2	3.3 ±0.6	8.7 ±0.6
	-	8.3 ±0.6	5.3 ± 1.2	4.0 ±0.0	9.0 ±6.1

↵a average of the three isolates.
↵b girdled = trees girdled mechanically by removing bark 3 cm wide around 50% of the circumference 10 cm above the ground.