TITLE (click title to view slides)
E. P. Prostko
and W. C. Johnson III
W. J. Grichar (TX)
D. L. Jordan (NC)
G. A. MacDonald (FL)
TABLE OF CONTENTS
- Peanut Response to Valor Application Timings E. P. Prostko and W. C. Johnson III, (GA) W. J. Grichar (TX) D. L. Jordan (NC) G. A. MacDonald (FL)
- Valor in Peanuts labeled on April 12, 2001 G-E broadleaf weed control minimal rotation restrictions narrow application window unexpected injury
- Peanut Acres Treated with Valor and Injury by Region in 2001 Source: Valent U.S.A. Corp.
- Objective To evaluate the effects of the timing of Valor on peanut growth, yield, and maturity.
- Material and Methods 5 locations small plot techniques 3-4 replications Valor (3 oz/A) applied 0 to 10 DAP weed-free conditions crop injury, yield, maturity
- Materials and Methods
- Materials and Methods applications made after 3 DAP are off label peanuts were cracking or emerged on or after…… * GA1 - 7 DAP * GA2 - 10 DAP * FL - 8 DAP * NC - 7 DAP * TX - 7 DAP
- RESULTSCrop Injury
- Crop Injury Summary- IStunting/Leaf Burn GA1 - all timings caused significant crop injury (25-88%) GA2 - significant crop injury 6, 8, and 10 DAP (13-33%) FL - no crop injury was observed
- Crop Injury Summary - IIStunting/Leaf Burn NC - significant crop injury when applied 7 and 10 DAP (9-18%). TX - significant crop injury when applied 7 and 10 DAP (10-30%).
- Valor Injury
- Peanut Yield in Response to ValorTifton, GA a abc ab bc c d e
- Peanut Yield in Response to ValorAttapulgus, GA P = 0.66
- Peanut Yield in Response to ValorCitra, FL P = 0.31
- Peanut Yield in Response to Valor Lewiston, NC P = 0.56
- Peanut Yield in Response to Valor Yoakum, TX P = 0.48
- Peanut Maturity in Response to ValorBlack Hulls Tifton, GA September 19, 2001 GA Green Planted: May 8 a b b b b b c
- Peanut Maturity in Response to ValorBlack + Brown Hulls Tifton, GA September 19, 2001 GA Green Planted: May 8 a ab bc bc bc b c
- Peanut Maturity in Response to ValorOrange + Yellow Hulls Tifton, GA September 19, 2001 GA Green Planted: May 8 c bc ab ab ab b a
- Summary - I Valor caused significant crop injury, particularly when applied at 6 DAP or later. Peanuts yields were not reduced by any application of Valor in 4 out of 5 tests.
- Summary - II In Tifton, GA, Valor caused significant yield reductions when applied 3 DAP or later. In Tifton, GA peanut maturity was delayed (7-14 days) as indicated by differences in hull color at harvest.
- Valor in Peanuts - 2002Suggestions calibration pre-slurry plant 1.5” deep apply at planting do not irrigate when cracking hull scrape limited acreage
- University of Georgia Extension Weed Science (gaweed.com)