Allelochemicals Biologica... - Name

10
DAVID E. WEDGE
AND BARBARA J. SMITH
Table 1. Anthracnose disease severity and phytotoxicity (Phyto) scores of detached
leaves following inoculation with Colletotrichum fragariae isolate CF-75, pre and
post treatment with commercial and experimental fungicides.
Azoxystrobin CAY-1 Sampangine
Level Disease 1 Phyto 1 Disease Phyto Disease Phyto
Fungicide applied to the upper leaf surface. Leaves not inoculated.
None 0.29 a 2 0.04 A 0.29 a 0.04 a 0.29 a 0.04 a
Solvent 0.29 a 0.15 A 0.29 a 0.15 a 0.29 a 0.15 a
625 0.17 a 0.00 A 0.10 a 0.00 a 0.08 a 0.08 a
1250 0.19 a 0.08 A 0.21 a 0.04 a 0.13 a 0.04 a
2500 0.08 a 0.04 A 0.21 a 0.00 a 0.17 a 0.08 a
lsd 0.34 0.20 0.32 0.16 0.30 0.19
Pr>F 0.70 0.67 0.75 0.52 0.50 0.80
Fungicide applied to the upper leaf surface 24 hr before inoculation (Post).
None 0.75 a 0.33 A 0.75 ab 0.33 a 0.75 a 0.33 a
Solvent 0.83 a 0.00 B 0.83 a 0.00 b 0.83 a 0.00 b
625 0.42 ab 0.08 B 0.33 bc 0.00 b 0.25 b 0.00 b
1250 0.08 b 0.17 ab 0.21 c 0.00 b 0.17 b 0.00 b
2500 0.42 ab 0.00 b 0.21 c 0.08 b 0.29 b 0.00 b
lsd 0.54 0.23 0.42 0.17 0.41 0.17
Pr>F 0.06 0.04 0.02 0.00 0.01 0.00
Fungicide applied to the upper leaf surface 24 hr after inoculation (Pre).
None 0.58 a 0.08 b 0.58 abc 0.08 b 0.58 a 0.08 b
Solvent 0.25 a 0.33 a 0.25 c 0.33 ab 0.25 a 0.33 ab
625 0.33 a 0.08 b 0.92 ab 0.58 a 0.75 a 0.08 b
1250 0.83 a 0.08 b 1.00 a 0.25 ab 0.75 a 0.08 b
2500 0.67 a 0.08 b 0.83 ab 0.08 b 0.58 a 0.50 a
lsd 0.60 0.23 0.47 0.57 0.36
Pr>F 0.27 0.14 0.04 0.28 0.36 0.08
Fungicide applied to the lower leaf surface (translaminar) 24 hr before inoculation.
625 0.33 a 0.04 a . . . . 0.13 a 0.08 a
1250 0.08 a 0.04 a . . . . 0.25 a 0.08 a
2500 0.17 a 0.00 a . . . . 0.29 a 0.08 a
lsd 0.37 0.09 0.31 0.26
Pr>F 0.34 0.51 0.46 0.63
Fungicide applied to the lower leaf surface (translaminar) 24 hr after inoculation.
625 0.33 a 0.00 a . . . . 0.38 a 0.17 a
1250 1.21 a 0.25 a . . . . 0.58 a 0.17 a
2500 0.58 a 0.17 a . . . . 0.67 a 0.17 a
lsd 1.09 0.31 0.71 0.43
Pr>F 0.22 0.23 0.64 1.00
1Disease scored on scale of 0 = no lesions to 3 = severe; phytotoxicity scored on scale of 0 – 5 where, 0 = no
signs of damage 5 = severe tissue damage.
2Average values followed by the same letter were not significantly different at the 0.05 level using Least
Significant Difference at P=0.05.