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Bruce Burdick
1109 S. Birch St.
Albany, MO 64402
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BurdickB@missouri.edu
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SHATTERCANE CONTROL IN CORN WITH POST HERBICIDES
Study C0BA0211 AND 0211REDO
By Donald E. Null, Regional Agronomy Specialist, UO&E
Objective: To compare post emergence herbicides for shattercane control in field corn.
Materials and methods: The two studies discussed here were designed as a randomized complete blocks 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. Treatments were the same in both studies.
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 May 4 (study 0211) and May 5 (0211REDO). Pre-emergence treatments were made immediately after planting. Rainfall in the amount of 0.41" fell on May 9. The next rain was 1.17" on May 26. Post-emergence treatments were made on May 30 to 6-10" tall corn in both studies.
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 wild sunflower and shattercane but there was also light to moderate infestations of giant foxtail within the studies.
Results: There were some differences in giant foxtail control between treatments but they were minor. Figure 1 shows the results of two ratings. One is the 26 days after treatment (DAT) rating for study 0211 and the other is the 41 days after treatment rating for 0211REDO.
Treatment
Number |
TREATMENT
Product Name and product rate used/acre |
% GIANT FOXTAIL CONTROL |
| 28 DAT RATING ON STUDY 0211 |
41 DAT RATING ON 0211REDO |
| 1 | Weedy check | 0 | 0 |
| 2 | Pre-Emergence Degree, 4.6 pints | 96 | 78 |
| 3 | Pre Outlook, 1.125 pints | 96 | 85 |
| 4 | Pre Dual II Magnum, 1.66 pints | 80 | 86 |
| 5 | Pre Outlook, 1.125 pints | 96 | 88 |
| 6 | Pre Dual II Magnum, 1.66 pints | 79 | 84 |
| 7 | Pre Outlook, 1.125 pints | 97 | 93 |
| 8 | Pre Topnotch, 5 pints | 97 | 95 |
| 9 | Pre Outlook, 0.75 pints (reduced rate) | 40 | - |
| 10 | Pre Leadoff, 1.5 pints (reduced rate) | 43 | - |
| 11 | Pre Guardsman, 1.5 pints (reduced rate) | 47 | - |
| LSD 0.05 | 11 | 8 |
Table 1
Table 2 shows the results of three reduced rate pre-emergence treatments followed by planned post-emergence treatments in the 0211REDO study. These same treatments were made to study 0211 and the results were very similar. Control of broadleaf weeds in the study ranged from 92-93% velvetleaf control and 92-98% wild sunflower control with the three treatments and the differences were not statistically significant.
The ratings for end-of season shattercane control can be seen in Table 3.
Wild sunflower control ratings can be seen in Table 4.
Treatment
Number |
TREATMENT ON #0211REDO
Product Name and product rate used/acre |
% GIANT FOXTAIL CONTROL |
| Before post treatment |
After post treatment |
| 9 | Pre Outlook, 0.75 pints (reduced rate) followed by Celebrity Plus, 4.8 ounces + NIS, 0.25% v/v + UAN, 2.5% v/v on 6-10" tall corn | 25 | 100 |
| 10 | Pre Leadoff, 1.5 pints (reduced rate) followed by Basis Gold, 14 ounces + COC, 1% v/v + UAN, 2.5% v/v on 6-10" corn | 23 | 100 |
| 11 | Pre Guardsman, 1.5 pints (reduced rate) ) followed by Celebrity Plus, 4.8 ounces + NIS, 0.25% v/v + UAN, 2.5% v/v on 6-10" corn | 20 | 98 |
| LSD 0.05 | 11 | 8 |
Table 2
Treatment
Number |
TREATMENT
Product Name and product rate used/acre |
END OF SEASON PERCENT SHATTERCANE CONTROL |
| STUDY 0211 |
STUDY 0211REDO |
| 1 | Weedy check | 0 | 0
| | 2 | Pre-Emergence Degree, 4.6 pints followed by Buctril/atrazine, 0.6 pints on 6-10" corn | 28 | 23 |
| 4 | Pre Dual II Magnum, 1.66 pints followed by Northstar, 5 ounces + UAN, 2.5% v/v + NIS, 0.25% v/v on 6-10" corn | 99 | 98 |
| 6 | Pre Dual II Magnum, 1.66 pints followed by Spirit, 1 ounce + UAN, 2.5% v/v + NIS, 0.25% v/v on 6-10" corn | 99 | 95 |
| 7 | Pre Outlook, 1.125 pints followed by Distinct, 6 ounces + UAN, 1.25% v/v + NIS, 0.25% v/v on 6-10" corn | 40 | 27 |
| 8 | Pre Topnotch, 5 pints followed by Hornet 85.6DF, 2.4 ounces + NIS, 0.25% v/v | 0 | 17 |
| 9 | Pre Outlook, 0.75 pints (reduced rate) followed by Celebrity Plus, 4.8 ounces + NIS, 0.25% v/v + UAN, 2.5% v/v on 6-10" tall corn | 98 | 95 |
| 10 | Pre Leadoff, 1.5 pints (reduced rate) followed by Basis Gold, 14 ounces + COC, 1% v/v + UAN, 2.5% v/v on 6-10" corn | 96 | 98 |
| 11 | Pre Guardsman, 1.5 pints (reduced rate) ) followed by Celebrity Plus, 4.8 ounces + NIS, 0.25% v/v + UAN, 2.5% v/v on 6-10" corn | 98 | 95 |
| LSD 0.05 | 23 | 12 |
Table 3
Treatment
Number |
TREATMENT
Product Name and product rate used/acre |
END OF SEASON PERCENT SUNFLOWER CONTROL |
| STUDY 0211 |
STUDY 0211REDO |
| 1 | Weedy check | 0 | 0 |
| 2 | Pre-Emergence Degree, 4.6 pints followed by Buctril/atrazine, 0.6 pints on 6-10" corn | 94 | 97 |
| 3 | Pre Outlook, 1.125 pints followed by Marksman, 3.5 pint + UAN, 2.5% v/v on 3-5" corn | 100 | 97 |
| 4 | Pre Dual II Magnum, 1.66 pints followed by Northstar, 5 ounces + UAN, 2.5% v/v + NIS, 0.25% v/v on 6-10" corn | 98 | 95 |
| 5 | Pre Outlook, 1.125 pints followed by Clarity, 1.0 pint + UAN, 2.5% v/v on 3-5" corn | 99 | 100 |
| 6 | Pre Dual II Magnum, 1.66 pints followed by Spirit, 1 ounce + UAN, 2.5% v/v + NIS, 0.25% v/v on 6-10" corn | 99 | 96 |
| 7 | Pre Outlook, 1.125 pints followed by Distinct, 6 ounces + UAN, 1.25% v/v + NIS, 0.25% v/v on 6-10" corn | 98 | 98 |
| 8 | Pre Topnotch, 5 pints followed by Hornet 85.6DF, 2.4 ounces + NIS, 0.25% v/v | 100 | 98 |
| 9 | Pre Outlook, 0.75 pints (reduced rate) followed by Celebrity Plus, 4.8 ounces + NIS, 0.25% v/v + UAN, 2.5% v/v on 6-10" tall corn | 99 | 95 |
| 10 | Pre Leadoff, 1.5 pints (reduced rate) followed by Basis Gold, 14 ounces + COC, 1% v/v + UAN, 2.5% v/v on 6-10" corn | 98 | 97 |
| 11 | Pre Guardsman, 1.5 pints (reduced rate) ) followed by Celebrity Plus, 4.8 ounces + NIS, 0.25% v/v + UAN, 2.5% v/v on 6-10" corn | 100 | 97 |
| LSD 0.05 | 3 | 4 |
Table 4
Summary: The lack of common waterhemp pressure in the study did not allow for difference in herbicide mode of action for control of that weed to be shown. The studies did show the difference that exists in shattercane control however. All of the herbicide treatments provided commercially acceptable control of wild sunflower in the two studies.
Treatments 9-11 show that good end of season weed control ratings can be obtained for giant foxtail, shattercane and wild sunflower control without the use of full rates of pre-emergence herbicides.
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