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University of Arizona (1984)

HERBICIDE COMBINATIONS FOR PREEMERGENCE WEED CONTROL IN CONTAINER-GROWN ARID LANDSCAPE PLANTS

Alexander, Judith Ann

Titre : HERBICIDE COMBINATIONS FOR PREEMERGENCE WEED CONTROL IN CONTAINER-GROWN ARID LANDSCAPE PLANTS

Auteur : Alexander, Judith Ann

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1984

Résumé
Four preemergence herbicide combinations were evaluated for control of Euphorbia supina in container-grown Yucca elata, Yucca valida, Calliandra eriophylla, Prosopis sp. and Simmondsia chinensis. Oxyfluorfen + oryzalin provided 100% weed control at 2.2 + 2.2, 4.5 + 4.5 and 1.1 + 6.7 kg/ha. However, unacceptable growth stunting of Yucca sp. and £. eriophylla was observed at 2.2 + 2.2 and 4.5 + 4.5 kg/ha. Oxyfluorfen + oxadiazon provided a mean of 97.8% weed control at 0.6 + 6.7, 1.1 + 4.5, and 2.2 + 4.5 kg/ha. A wide range (10-42%) of reduced growth rates of Yucca sp. and S^. chinensis were observed at 2.2 + 4.5 and 0.6 +6.7 kg/ha. Oxadiazon + oryzalin provided a mean of 96.8% weed control at 2.2 + 2.2, 4.5 + 4.5, and 1.1 + 6.7 kg/ha respectively. Growth of S_. chinensis was reduced 25-32% at 4.5 + 4.5 and 1.1 + 6.7 kg/ha respec tively. Oxyfluorfen + pendimethalin provided limited weed control. The 1.1 + 0.6 kg/ha rate gave only 50% control throughout the study. Rates of 2.2 + 1.1 and 3.4 + 1.7 kg/ha provided a mean of 95% control during August through January, however, efficacy dropped to 40% during May through July. _Y. elata exhibited 20% to 40% reduction in growth depend ing on treatment rate.

Mots clés : Herbicides — Research — Arizona. ; Plants — Effect of herbicides on. ; Weeds — Control.

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