Fungicides and Application Timing for Control of Early Leafspot, Southern Blight, and Sclerotinia Blight of Peanut
Table 2
Control of peanut diseases, yield, and grade when using foliar fungicides in South Texas.
Treatments
L/ha
Appl
Early leafspot
Southern blight
Yield
Grade
2013
2014
2013
2014
2013
2014
2013
2014
Florida scale
% infection
kg/ha
% SMK + SS
Nontreated control
—
—
9.7
6.0
40.8
19.8
990
3440
67.9
65.4
Propiconazole + chlorothalonil
1.75
A C
3.2
1.7
9.2
3.5
4320
4250
70.0
71.3
Azoxystrobin
0.88
B D
Cyproconazole
0.40
B D
Propiconazole + chlorothalonil
1.75
A
4.1
1.8
9.8
10.3
4020
4060
69.5
70.3
Prothioconazole + tebuconazole
0.59
B C D
Chlorothalonil
1.75
A
—
2.0
—
5.5
—
4690
—
71.4
Prothioconazole + tebuconazole
0.59
B C D
Propiconazole + chlorothalonil
1.75
A
4.9
1.9
8.2
5.3
3900
4630
69.9
70.0
Penthiopyrad
1.17
B C D
Pyraclostrobin
0.66
A
5.5
2.3
11.6
3.5
4000
4420
69.9
71.9
Penthiopyrad
1.17
B C D
Pyraclostrobin
0.66
A
4.9
1.6
13.8
2.0
3900
4890
68.3
72.4
Prothioconazole + tebuconazole
0.51
B C D
Pyraclostrobin
0.66
A
8.6
4.8
22.2
4.5
2130
4440
70.0
72.5
Flutolanil
1.17
B C D
Chlorothalonil
1.75
A B C D
5.9
2.2
22.0
13.2
3490
3870
68.9
69.1
LSD (0.05)
0.7
0.4
7.8
7.5
450
630
NS
2.9
Early leafspot, Cercospora arachidicola S. Hori. Southern blight, Sclerotium rolfsii Sacc. In 2013, Treatment 3 included chlorothalonil only at C; Treatment 4 included chlorothalonil only at A. Application timing: A, 60 days after planting (DAP); B, 80 DAP; C, 100 DAP; 120 DAP. Leaf spot assessed using the Florida 1–10 scale where 1 = no disease and 10 = completely dead. SMK: sound mature kernels; SS: sound splits.
