Oakes Irrigation Research
Site
Carrington Research Extension Center * North Dakota State University
P.O. Box 531, Oakes, ND 58474-0531, Voice: (701) 742-2189, FAX: (701)
742-2700, email: rgreenla@ndsuext.nodak.edu
TOPSIN FOR WHITE MOLD CONTROL IN PINTO BEAN, 2001
Pat Gross and Luis del Rio, NDSU Plant Pathology Department
See “WHITE MOLD CONTROL IN EDIBLE BEAN, 2001 STUDIES” for a description of materials and methods.
Table 48. Topsin effects on incidence and severity of white mold and pinto bean yield
Table 47. Fungicide treatments for the Topsin for white mold control in pinto bean study at Oakes, ND, 2001.
Treatment Number |
Chemical |
Rate per acre |
Time of application |
1 |
Untreated check |
0.0 |
|
2 |
Topsin 70 WSB |
1.5 lb |
One spray at 10% bloom on July 3 |
3 |
Topsin 70 WSB |
1.5 lb |
One spray on July 9 |
4 |
Topsin 70 WSB |
1.5 lb |
One spray on July 11 |
5 |
Topsin 70 WSB |
1.0 lb |
Sprayed on July 3 and July 11 |
6 |
Topsin 70 WSB |
1.0 lb |
Sprayed on July 5 and July 13 |
7 |
Topsin 70 WSB |
1.0 lb |
Sprayed on July 9 and July 13 |
Table 48. Topsin effects on incidence and severity of white mold at Oakes, ND, 2001.
Treatment number1 |
% incidence2 |
% severity3 |
Yield (lbs/acre) |
||
July 30 |
August 5 |
July 30 |
August 5 |
||
1 |
82.5 |
82.5 |
26.6 |
50.1 |
2464 |
2 |
72.5 |
82.5 |
21.0 |
44.5 |
2311 |
3 |
66.3 |
77.5 |
15.1 |
35.5 |
2861 |
4 |
47.5 |
61.3 |
12.9 |
27.7 |
2952 |
5 |
45.0 |
66.3 |
6.5 |
27.2 |
2953 |
6 |
21.3 |
37.5 |
2.7 |
15.3 |
3134 |
7 |
32.5 |
41.3 |
4.6 |
14.1 |
3033 |
LSD (0.05) |
14.2 |
13.8 |
16.7 |
21.8 |
377 |
1See Table 47 for treatment discriptions.
2Incidence based on number of infected plants divided by total number of observations.
3Severity is based on average percentage disease of infected plants.
Soil conditions at planting were dryer then previous years. The field received irrigation early to insure adequate moisture for good germination. Plants did germinate uniformly across the field. Plant growth was slow in May and early June because of below normal temperatures. Temperatures were near or above normal for the rest of the growing season thus plant growth was normal by the end of June. Plants began to flower on July 1. Row closure was around 25% on July 3. By July 13 rows were completely closed and it was difficult to spray the plots. Because rows were closed it was decided to spray treatment 7 on July 13 rather then July 15. White mold was severe and uniform across the field. Topsin applied at 10% bloom did not reduce white mold significantly from the untreated check. Plants treated with Topsin with two applications at 1.0 lb/acre applied on July 5 or later reduced white mold incidence and severity compared to the other treatments and the untreated check. Topsin applied at 10% bloom was the only treatment that did not increase yield (compared to the check treatment).
Go to Oakes Irrigation Research Site 2001 annual report
Go to Oakes Irrigation Research Site disease studies