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Bruce Burdick
1109 S. Birch St.
Albany, MO 64402
660-726-5610
Email:
BurdickB@missouri.edu
Hundley-Whaley Center phone
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PRE-EMERGENCE CORN HERBICIDES COMPARED
Study C0BA0113
By Donald E. Null, Regional Agronomy Specialist, UO&E
Objective: To compare the efficacy of pre-emergence herbicides for corn.
Materials and methods: The study was designed as a randomized complete block with 3 replications. Plot size was 12" wide by 30" long. Treatments were applied to the center 6' of each plot thereby allowing 6' running checks between plots.
Kruger 9915 brand of seed corn was planted in 36" wide rows at a rate of 25,500 seeds per acre into a conventionally prepared seedbed on April 19. Pre-emergence treatments were made immediately after planting. Rainfall in the amount of 1.3" fell within 24 hours of the pre-emergence herbicide applications. One treatment was applied to "spike" stage corn on May 2.
Herbicides were applied with a C-Farmal using compressed air as the spray solution propellant. Treatments were delivered in 20 gallons per acre of spray solution. Water was the carrier. Spray tips were 110-degree flat fan nozzles delivering 0.2 gallons per minute and spaced 18" apart on the spray boom.
The most dominant weeds in the study were giant foxtail, wild sunflower and shattercane. The treatments in the study are in table 1.
Results: All of the treatments in the study provided excellent giant foxtail control. Each of the pre-emergence treatments provided fair early sunflower control but the sunflower pressure within the plot area was very heavy and by seasons-end, fair control was just not enough. Table 1 shows the results of sunflower ratings throughout the season.
Treatment
Number |
TREATMENT
Product Name and product rate used/acre |
PERCENT SUNFLOWER CONTROL |
| May 17 |
May 26 |
July 3 |
| 1 | Weedy check | 0 | 0 | 0 |
| 2 | Pre-emergence Bicep II Magnum, 5.2 pints/acre | 75 | 57 | 0 |
| 3 | Pre Guardsman, 5 pints/acre | 78 | 57 | 3 |
| 4 | Pre Harness Xtra, 5.4 pints/acre | 67 | 53 | 0 |
| 5 | Pre Degree Xtra, 7.25 pints/acre | 70 | 53 | 0 |
| 6 | Pre FulTime, 6.6 pints | 82 | 58 | 0 |
| 7 | Pre Guardsman, 5 pts + Balance, 1 oz/acre | 85 | 77 | 10 |
| 8 | Pre Guardsman, 5 pts + Hornet 85.6DF, 2.4 oz/acre | 93 | 97 | 96 |
| 9 | Pre Axiom AT, 3.25 lb/acre | 77 | 60 | 3 |
| 10 | Pre Epic, 15 ounces/acre | 63 | 57 | 3 |
| 11 | Pre Harness, 2.25 pt + Hornet, 4 ounces/acre | 98 | 99 | 97 |
| 12 | Applied at corn spike stage - Outlook, 1.12 pint + Marksman, 3.5 pint + UAN, 2.5% v/v | 94 | 92 | 95 |
| 13 | Pre Guardsman, 5 9 pints followed by Distinct, 4 oz + NIS 0.25%v/v/ + UAN, 1.25% v/v per acre applied to 6-10" corn on May 15 | 57 | 99 | 100 |
| LSD 0.05 | 13 | 11 | 4 |
Table 1
Shattercane became a serious weed problem wherever sunflower were controlled. One treatment did provide partial shattercane control however. Treatment 13 provided 55% shattercane control at the end-of-season rating on September 12.
Summary: Rainfall in the amount of 1.3"/acre fell within 24 hours after the pre-emergence herbicides were applied. All pre-emergence treatments in the study provided excellent control of giant foxtail. Only two pre-emergence treatments provided acceptable (over 95%) control of wild sunflower. They were treatment #8 and 11. The only common herbicide in these two treatments was Hornet. Treatment #13, Guardsman pre followed by Distinct on 6-10" tall corn, provided the best overall weed control in the study.
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