Suitable Adjuvant to Maximize Trifloxysulfuron Efficacy and Early Assessment of Herbicide Efficacy Using Chlorophyll Fluorescence

    Volume 3, Issue 1 (January 2006)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Page Count: 12


    Singh, S
    Research Associate, University of Florida-IFAS, Citrus Research and Education Center, Lake Alfred, FL

    Singh, M
    Professor of Weed Science, University of Florida-IFAS, Citrus Research and Education Center, Lake Alfred, FL

    (Received 30 November 2004; accepted 7 August 2005)

    Abstract

    Trifloxysulfuron 2.5, 5, and 10 g ai/ha mixed with non-ionic (0.25% Induce and X-77), organosilicone (0.1 % Kinetic and Silwet L-77), and crop oil concentrate (1 % Agridex and Meth-N-Oil) adjuvants was evaluated for efficacy, surface tension (ST), contact angle (CA), and chlorophyll fluorescence responses in redroot pigweed, prickly sida, and barnyard grass. The lowest ST and CA were recorded with L-77 mixed with trifloxysulfuron. Among the six adjuvants, ST and CA were highest with Meth-N-Oil; however, these differences did not greatly influence herbicide efficacy. No trifloxysulfuron-adjuvant antagonism was found for any weed species. Differences in activities were observed at 2.5 g/ha trifloxysulfuron with different adjuvants; however, activities were comparable when data were averaged over species and rates. All the adjuvants increased trifloxysulfuron efficacy; some differences were observed among the weed species, but adjuvants were equal in improving trifloxysulfuron efficacy. Redroot pigweed was more sensitive to trifloxysulfuron compared to barnyardgrass and prickly sida was least. Chlorophyll fluorescence 1, 4, 7, and 14 days after treatment (DAT) was not greatly inhibited by trifloxysulfuron mixed with different adjuvants. Reduction in chlorophyll fluorescence was recorded 4 DAT in barnyard grass, but the reduction was not proportionate to the mortality and lacked uniformity among different treatments.


    Paper ID: JAI12913

    DOI: 10.1520/JAI12913

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    Author
    Title Suitable Adjuvant to Maximize Trifloxysulfuron Efficacy and Early Assessment of Herbicide Efficacy Using Chlorophyll Fluorescence
    Symposium Pesticide Formulations and Delivery Systems: Advances in Crop Protection Technologies: 25th Volume, 2004-10-07
    Committee E35