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Imazethapyr and Imazaquin Control Puncturevine (Tribulus terrestris) but Carry Over to Spinach (Spinacia oleracea)

Published online by Cambridge University Press:  12 June 2017

David H. Johnson  and
Ronald E. Talbert
David H. Johnson
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72703
Ronald E. Talbert
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72703
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Abstract

The control of puncturevine in southern peas with imazethapyr and imazaquin and the potential for carryover of these herbicides to spinach was evaluated in Arkansas. Imazethapyr (0.07 kg ai ha−1) and imazaquin (0.14 kg ha−1) applied to southern peas either PPI tank-mixed with trifluralin (0.84 kg ha−1) or PRE or POST following trifluralin controlled puncturevine at least 70%. Imazaquin and imazethapyr remaining in soil after use caused injury and yield reduction to spinach planted 3 to 4 mo after herbicide application in the fall after southern pea harvest. In spring spinach planted 8 to 9 mo after herbicide application, the only injury observed was from soil residues of imazethapyr applied POST in one of two years, with no yield reduction. In rate by timing experiments, imazethapyr at 0.07 kg ha−1 applied PPI, PRE, and 3 and 6 d after puncturevine emergence controlled puncturevine at least 95% at the 2-wk rating. At the 4-wk rating, imazethapyr at 0.07 kg ha−1 applied PRE provided this level of control. Imazaquin at 0.07 and 0.14 kg ha−1 controlled puncturevine greater than 93% when applied up to 12 d after emergence. Puncturevine control was less with both herbicides at lower rates and as application timing increased.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidtrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminepuncturevine, Tribulus terrestris L. # TRBTEsouthern pea, Vigna unguiculata (L.) Walpersspinach, Spinacia oleracea L.Application timingcarryoverbentazonclomazonefomesafenmetolachlortrifluralinAmaranthus albusAmaranthus palmeriDigitaria sanguinalisEriochloa gracilisMollugo verticillataAMAALAMAPADIGSAERBGRMOLVETRBTE
Type
Research
Information
Weed Technology , Volume 7 , Issue 1 , March 1993 , pp. 79 - 83
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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