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
Richard Greenland, Oakes Irrigation Research Site
Timothy Ulrich, DuPont Agricultural Products
Table 69. Disease ratings and yield of edible beans.
White mold occurs frequently in edible dry beans in North Dakota. In this
study we looked at rates, surfactants, and number of applications of Benlate
needed to control white mold. We also looked at Quadris alone and with Benlate.
Quadris is not labeled yet for white mold control in edible beans.
MATERIALS AND METHODS
| Soil: | Maddock sandy loam and Egeland sandy loam; pH=7.9; 2.6% organic matter; soil-P and soil-K were very high; soil-S was meduim. |
| Previous crops: | 1998 - onion; 1997 - carrot; 1996 - sweet corn. |
| Seedbed preparation: | Disked on 5 November 1998. Disked April 12. Field cultivated twice to incorporate fertilizer and smooth seed bed on May 11. |
| Planting: | Planted May 12 in 30-inch rows. |
| Plots: | 17 ft long by 10 ft (4 rows) wide. There were 4 reps. |
| Fertilizer: | On April 7, broadcast 15 lbs N/acre and 75 lbs P2O5/acre as 10-50-0, 18 lbs N/acre and 20 lbs S/acre as 21-0-0-24, and 99 lbs K20/acre as 0-0-60. Sprayed 40 lbs N/acre as 28-0-0 on April 12. Knifed in 50 lbs of N/acre as 28-0-0 + N-Serve (1 qt/acre) on June 9. |
| Irrigation: | Overhead sprinkler irrigation as needed. |
| Pest Control: | Weeds were controlled by Sonalan (2 pt/acre preplant incorporated on May 11), Roundup + nonionic surfactant (16 oz/acre + 1 qt/50 gal on May 13), Dual (1.5 pt/acre on May 13), Basagran (2 pt/acre on June 7), cultivation (June 8 and July 2), and hand weeding. |
| Harvest: | Plants were harvested Aug 23 and Aug 24 from an 8 foot section of the center two rows from each plot. Plants were clipped from their roots and placed in bags and allowed to dry until they were threshed on Oct 8. |
Benlate applied twice controlled white mold the best. With two applications of Benlate, the low rate was just as good as the high rate for white mold control. With a single application, white mold control increased as rate of Benlate increased. Adding a surfactant did not significantly affect white mold control or edible bean yield. Quadris did not control white mold.
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Table 69. Disease ratings and yield for the fungicide trial for white mold in edible beans at the Oakes Irrigation Research Site. Ratings taken on 5 August 1999.
| Fungicide(s) | Rate | Number of applications | White mold incidence‡ | % of plot with white mold | Yield |
| lbs/acre† | % | lbs/acre | |||
| Benlate | 1.0 | 1 | 20 | 40 | 1224 |
| Benlate | 1.5 | 1 | 12 | 20 | 1332 |
| Benlate | 2.0 | 1 | 9 | 14 | 1279 |
| Benlate | 1.0 | 2 | 2 | 5 | 1372 |
| Benlate | 1.5 | 2 | 1 | 1 | 1496 |
| Benlate | 2.0 | 2 | 1 | 2 | 1438 |
| Benlate + Activator 90 | 1.5 + ½ % | 1 | 9 | 18 | 1374 |
| Benlate + MSO | 1.5 + 1 pt | 1 | 14 | 25 | 1316 |
| Benlate + COC | 1.5 + 1 pt | 1 | 12 | 19 | 1347 |
| Benlate + Silwet | 1.5 + ¼ % | 1 | 13 | 20 | 1444 |
| Benlate + Quad 7 | 1.5 + 1 % | 1 | 8 | 13 | 1309 |
| Quadris | 9.6 fl oz | 1 | 24 | 49 | 1138 |
| Benlate + Quadris | 1.5 + 9.6 fl oz | 1 | 14 | 26 | 1165 |
| Check | 17 | 36 | 1278 | ||
| LSD (0.05) | 6 | 13 | 202 | ||
| C. V. (%) | 38 | 43 | 11 | ||
| Probability | 0.0001 | 0.0001 | 0.04 | ||
†In lbs/acre unless stated
otherwise
‡Number of times white mold occurred per plot
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Go to Oakes Irrigation Research Site 1999 annual report
Go to Oakes Irrigation Research Site disease studies