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Table 1 in:


Browne, G. T., Prichard, T. L., Schmidt, L. S., and Krueger, W. H. 2011. Evaluation of phosphonate treatments for control of Phytophthora crown rot of walnut. Online. Plant Health Progress doi:10.1094/PHP-2011-0601-01-RS.



Table 1. Effects of foliar spray and chemigation treatments with phosphonate on severity of trunk cankers caused by Phytophthora citricola on Persian walnut cultivar Chandler.

Exp. Assess.
period
w
Months
since
treat-
ment
Treatment
effect
Value
of P
Chemigation
treatments
x
Foliar
treat-
ment
y
Mean area of canker necrosis
(and 95% C.I.) in cm²
Non-
inoculated
Inoculated
with P. citricola
1 1 1 Chemigation
×
foliar spray
0.0009 - - 2.8
(2.4-3.3)
31.5
(28.7-34.3)
- + 2.8
(2.4-3.3)
12.8
(10.1-15.6)
+ - 2.6
(2.2-3.1)
18.6
(15.9-21.4)
+ + 2.8
(2.3-3.2)
9.5
(6.7-12.2)
2 7 Foliar spray 0.04 combined - 0.0
(0-0.1)
48.6
(29.0-68.2)
combined + 0.0
(0-0.04)
23.0
(3.4-42.4)
2 1 1 Foliar spray <0.0001 combined - 2.5
(2.3-2.7)
17.8
(15.4-20.1)
combined + 2.5
(2.3-2.7)
12.3
(9.9-14.6)
2 7 Foliar spray 0.006 combined - 0.0
(non est.)z
550.4
(382.7-718.0)
combined + 0.0
(non est.)
363.1
(196.3-529.9)

 w Assessment periods, extending from date of wound inoculation to date of canker measurement, were as follows: experiment 1, period 1 = 7 October to 13 December 2005; experiment 1, period 2 = 28 April to 8 August 2006; experiment 2, period 1 = 3 October to 12 December 2006; experiment 2, period 2 = 30 April to 15 August 2007.

 x Chemigation included three applications of Fosphite (7 liters/ha) through irrigation water on 29 August, 6 September, and 12 September 2005 (experiment 1) or 28 August, 5 September, and 13 September 2006 (experiment 2).

 y Foliar spray included one application of Fosphite (7 liters/ha) through an air-blast sprayer on 12 September 2005 (experiment 1) or 13 September 2006 (experiment 2).

 z Confidence interval non estimable due to zero variance.








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