EFFECT OF PREEMERGENCE HERBICIDES ON CITRUS ROOTSTOCK AND LIVE OAK SEEDLINGS

FUTCH, S. H.

Abstract


Greenhouse studies were conducted to evaluate the response of citrus rootstocks and live oak seedlings to a single soil application of herbicides. Herbicides included in these studies were: Hyvar-X (bromacil), Direx (diuron), Surflan (oryzalin), Solicam (norflurazon), Princep (simazine), Mandate (thiazopyr), and Goal (oxyfluorfen). High rates of herbicides reduced shoot and root growth of citrus seedlings, especially for bromacil. Mild toxicity symptoms do not result in permanent growth reduction. Seedlings exhibited greater phytotoxicity symptoms for bromacil than diuron. Rootstock differences were also noted with Carrizo citrange being more sensitive to bromacil than Swingle citrumelo. Seedling growth and survival of live oak were effected by bromacil, diuron, and norflurazon.

Keywords


azafenidin; diuron; dichlobenil; norflurazon; oryzalin; thiazopyr; weed control

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283