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Effects of Spray Oils on Temperature, Net Gas Exchange, and Phytotoxicity of Citrus Leaves / M. Salyani, JP. Syvertsen, JL. Knapp

Conference Author
Pesticide Formulations and Application Systems: 10th Volume (10th : 1989 : Denver, Colorado)
Physical Description
1 online resource (9 pages) : illustrations, figures, tables
Additional Creators
Salyani, M., Syvertsen, JP., Knapp, JL., American Society for Testing and Materials, and ASTM International
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Summary
Three types of horticultural spray oils (Sunspray 7N, Sunspray 9N, and VOLCK Supreme Spray) were used to prepare spray mixtures of 1, 2, and 4% (V/V) oil plus emulsifier in water. The 50% distillation temperatures (50% DT) of the oils were 224, 235, and 247¿̐ưC (435, 455, and 476¿̐ưF), respectively. The mixtures were applied to the fully expanded young leaves of 2-year-old containerized ¿̐ưValencia¿̐ư orange trees in 2 tests. In the first test, leaves on different plants were dipped in agitated oil mixtures and after one day, under sunny conditions, their leaf temperature (T1, infrared thermometer) and stomatal conductance (Gs, diffusion porometer) were measured. There was no significant effect of oil DT on T1 or Gs. However, averaged over all DTs of oil, the 4 and 2% rates significantly decreased G below that of the 1% rate. In the second test, the 1 and 4% oil mixtures and an emulsifier only solution were uniformly sprayed on both surfaces of the leaves with a hand atomizer. Three to 5 days later, stomatal conductance, CO2 assimilation (A), and dark respiration (R) of sprayed leaves were determined, using an open gas exchange system in the laboratory. Neither oil DT nor oil concentration had a significant effect on G5 or A; however, R was highest with Sunspray 7N-1% and lowest with Sunspray 9N-4% treatments. In both tests, no visible phytotoxicity was observed after 3 months under glasshouse conditions.
Dates of Publication and/or Sequential Designation
Volume 1990, Issue 1078 (January 1990)
Subject(s)
Other Subject(s)
ISBN
9780803151369 (e-ISBN)
9780803113886
0803113889
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 14.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1990. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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