Herbicide Resistant Corn Hybrid Performance in Georgia E. P. Prostko, E. F. Eastin, W. K. Vencill, and R. D. Lee and R. D. Lee University of Georgia Dept.

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Presentation transcript:

Herbicide Resistant Corn Hybrid Performance in Georgia E. P. Prostko, E. F. Eastin, W. K. Vencill, and R. D. Lee and R. D. Lee University of Georgia Dept. Crop & Soil Sciences

Herbicide-Resistant Crops The problem ….. OR Will anyone buy them????

Herbicide Resistant Crops - US 2000 Source: NASS, June 2000

Herbicide Resistant Corn Hybrids What’s Available??  Roundup Ready  Liberty Link  Clearfield Corn** * IR or IT ** Not a GMO

Clearfield Corn (IR vs. IT) What’s the difference?  IR Hybrids (IMI-Resistant) * both parents carry resistance to IMI’s * both parents carry resistance to IMI’s * cross-resistant to SU’s (OP interactions, recrop) * cross-resistant to SU’s (OP interactions, recrop) * harder/slower to develop * harder/slower to develop  IT Hybrids (IMI-Tolerant) * only 1 parent has resistance to IMI’s * only 1 parent has resistance to IMI’s * easier/faster to develop * easier/faster to develop

Herbicide-Resistant Crops What do producers want/need to know??  weeds controlled  cost/A  yield potential  yield drag??

Herbicide Resistant Corn Hybrid Tests  3 locations  small plots  CN, RR, LL, Clearfield hybrids  treated/untreated  8” tall corn  grain yield

Results  no statistical differences in yield  no yield loss associated with herbicide application

Clearfield Corn Hybrid Performance in Georgia *Treated with Lightning (1.28 oz/A) + Atrazine (1.5 pt/A) + AMS (2.5 lbs/A) + COC (1% v/v)

Roundup Ready Corn Hybrid Performance in Georgia *Treated with Roundup Ultra (1 qt/A)

Liberty Link Corn Hybrid Performance in Georgia *Treated with Liberty (28 ozs/A) + AMS (2.5 lbs/A)

Herbicide Resistant Corn Hybrids in Georgia  hybrids that performed equal to or better than the test averages included the following: * Pioneer 32K63LL (Liberty) * Garst 8222IT (Clearfield) * Garst 8222IT (Clearfield) * Dekalb 626RR (Roundup) * Dekalb 626RR (Roundup) Need more data!!!!!

Herbicide Resistant Corn Hybrid Technologies Cost/A Cost/A for 1 application

The use of herbicide resistant corn hybrid technologies should be based upon ……………...  marketability  weed control problems  consistent hybrid performance and other agronomic traits  reduced or equal control costs

University of Georgia Extension Weed Science (gaweed.com)