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Synergistic and Antagonistic Combinations for Broadening Herbicidal Selectivity

Published online by Cambridge University Press:  12 June 2017

S. R. Colby ,
T. Wojtaszek  and
G. F. Warren
S. R. Colby
Affiliation:
Department of Horticulture, Purdue University, Lafayette, Indiana
T. Wojtaszek
Affiliation:
Department of Horticulture, Purdue University, Lafayette, Indiana
G. F. Warren
Affiliation:
Department of Horticulture, Purdue University, Lafayette, Indiana
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Abstract

Combinations of 3-chloro-2-methyl-p-valerotoluidide (solan) with 1,1′-dimethyl-4,4′-dipyridylium cation (paraquat) were used postemergence in transplanted tomatoes (Lycopersicon esculentum Mill.). Addition of .05 lb/A of paraquat to 2 or 4 lb/A of solan resulted in more effective control of crabgrass (Digitaria sanguinalis (L.) Scop.) than did doubling the rate of solan. The combinations were synergistic on crabgrass but only additive or more often antagonistic on tomato plants. The herbicides dimethyl 2,3,5,6-tetrachloroterephthalate (DCPA) and sodium 2,4-dichlorophenoxyethyl sulfate (sesone) were applied for preemergence weed control in strawberry beds. Velvetleaf (Abutilon theophrasti Medic.) was resistant to both DCPA and to sesone, but was quite susceptible to the combination. Combinations of 4,6-dinitro-o-sec-butylphenol (DNBP) with 2-methoxy-4,6-bis(ethylamino)-s-triazine (simetone) were highly synergistic on tomato plants. This synergism was more pronounced at low rates of herbicides.

Type
Research Article
Information
Weeds , Volume 13 , Issue 2 , April 1965 , pp. 87 - 91
Copyright
Copyright © 1965 Weed Science Society of America 

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References

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