Agricultural Applications of Petroleum Products (Advances in by Robert B. Killingsworth (Editor), G. W. Pearce (Editor)

By Robert B. Killingsworth (Editor), G. W. Pearce (Editor)

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Not above 600° F . These specifications were suggested because older specifications had been prepared before some of the new, higher aromatic oils were available. These new oils appear to be much more toxic to mosquito larvae than the older type oils. Nelson, Pierce, and D o n l a n have therefore included values that are ordinarily indicated i n a n aromatic type of o i l , mainly kauri butanol and the aniline point. The distillation range as given is a little too wide to be satisfactory, but i t is difficult to say definitely just how broad a range should be allowed.

J . , Pacific Rural Press, 61 (4), 51 (1901). (26) Yothers, W. , and McBride, O. , Trans. 4th Intern. Congr. ,1 6 5 - 7 4 (1928). RECEIVED M a y 18, 1 9 6 1 . Paper 704, University of California Citrus Experiment Station, Riverside, Calif. Phytotoxic and Insecticidal Study of a Petroleum Isoparaffinic Fraction A. E. GRIFFITHS and M. J. , New York, Ν. Y. A single isoparaffinic fraction in the approximate distilla­ tion range of kerosene was studied as an insecticide and ovicide, and for quality control in storage.

Per 100 sq. cm. 3 mg. per 100 sq. cm. for a naphthenic o i l . Equivalent values for 9 5 % k i l l of citrus red mite eggs i n the present studies were 21 and 15 micrograms per sq. , respectively. The LDw of the paraffinic stock o i l 46-M20 (25 micrograms per sq. ) listed i n Table I I is almost as low as that of the best fraction of the paraffinic series. ch003 RIEHL AND LaDUE—EVALUATION O F PETROLEUM FRACTIONS AGAINST CITRUS PESTS 35 molecular weight of 46-M20 is 330, which is only slightly lower than the critical value of 340 observed in Figure 4.

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