Hilgardia
Hilgardia
Hilgardia
University of California
Hilgardia

Dalapon, amitrole, and weed oil compared for effectiveness in control of bermudagrass in California citrus orchards

Authors

B. E. Day
C. D. McCarty
L. S. Jordan

Authors Affiliations

B. E. Day was Associate Plant Physiologist, Citrus Research Center and Agricultural Experiment Station, Riverside; C. D. McCarty was Associate Agriculturist, Agricultural Extension, Riverside; L. S. Jordan was Assistant Plant Physiologist, Citrus Research Center and Agricultural Experiment Station, Riverside.

Publication Information

Hilgardia 32(2):207-227. DOI:10.3733/hilg.v32n02p207. February 1962.

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Abstract

Dalapon, amitrole, and weed oil, used alone, as mixtures, or in combination, were compared for effectiveness in the control of bermudagrass. Split applications of dalapon, properly timed, were more effective than single applications with the same total amount of herbicide. Amitrole, and to a lesser extent dalapon, was more effective when applied late in the growing season. Variation in spray volume, the presence or absence of surfactant, or the inclusion of small amounts of kerosene had no effect on the toxicity of amitrole. Mixtures of dalapon and amitrole were less toxic than was dalapon applied alone at the same rate. Split applications of amitrole were less effective than single applications containing the same total amount of herbicide.

Repeat spraying with weed oil at three-week intervals was highly effective and gave control equal to the more frequent oil spraying.

In a screening program, atratone and prometone at rates of 10 pounds per acre controlled bermudagrass. Ipazine, trietazine, simetone, simazine, CIPC, EPTC, and maleic hydrazide were not highly toxic to bermudagrass. Sodium 2,3-dichloroisobutyrate was only an eighth as effective as dalapon.

This paper reports research on the evaluation of several chemicals as herbicides for the control of bermudagrass. No recommendations for or against the use of these chemicals are intended or implied. Federal and state laws regulate the use of agricultural chemicals, and persons wishing to use chemicals mentioned in this publication should consult local agricultural regulatory officials.

Literature Cited

Burt E. O., McCown J. T. Controlling perennial grasses in citrus orchards 1959. Proc. 12th Southern Weed Conf. 93-99. (Mimeo.)

Crafts A. S., Yamaguchi S. Comparative tests on the uptake and distribution of labeled herbicides by Zebrina pendula and Tradescantia fluminensis. Hilgardia. 1958. 27(16):421-54. DOI: 10.3733/hilg.v27n16p421 [CrossRef]

Day Boysie E. Urea herbicides for citrus weed control. Calif. Citrogr. 1955. 40:398 408, 410, 412

Day Boysie E. The bermudagrass problem in citrus and avocado orchards 1957. Proc. Ninth Ann. Calif. Weed Conf.: 22-25. (Mimeo.)

Day Boysie E. Weed control programs for citrus and avocado orchards. Calif. Citrogr. 1958. 44:60-61.

Day B. E., McCarty C. D. Monuron for weed control in citrus. California Agr. Exp. Sta. Leaf. 1957. 95:

Day B. E., Jordan L. S. Spray retention by bermudagrass. Weeds. 1961. 9(3):351-55. DOI: 10.2307/4040851 [CrossRef]

Kretchman D. W. Dalapon for controlling perennial grasses in Florida citrus groves. Down to Earth. 1961. 16(4):6-9.

Thiegs B. J. The stability of dalapon in soils. Down to Earth. 1955. 11(2):2-4.

Wessels J. S. C., van der Veen R. Action of some derivatives of phenylurethan and 3-phenyl-1, 1-dimethylurea on the Hill reaction. Biochim. et Biophys. Acta. 1956. 19:548-49. DOI: 10.1016/0006-3002(56)90481-4 [CrossRef]

Day B, McCarty C, Jordan L. 1962. Dalapon, amitrole, and weed oil compared for effectiveness in control of bermudagrass in California citrus orchards. Hilgardia 32(2):207-227. DOI:10.3733/hilg.v32n02p207
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