Responses of Pineapple Orange Trees to Selected Petroleum Oil Fractions1

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Differences in juice quality, when found, were usually very small among samples from pineapple orange trees following 4 selected spray oil fractions and a non-oil treatment applied in early July 1963-65. Juice quality was determined on all samples each fall. Percentage soluble solids did not differ following a heavier naphthenic or a "re-formed" oil fraction and non-oil treatment. In 9 comparisons, solids following heavier paraflinic and lighter naphthenic oil fractions were reduced slightly below that of the non-oil treatment 3 and 4 times, respectively. Percentage acid was greater in all samples checked in 1964 than in 1963 or 1965. The greater acid percentages were found with the lighter naphthenic oil treatment and the least acid with the non-oil treatment. Acid was intermediate for samples from other oil plots. Leaf drop gencrally was heaviest during the first 3 weeks after treatment, declined for 3 to 4 weeks and then increased again during weeks 8-10. The greatest leaf drop was recorded with the heavier paraffinic and naphthenic oils of comparable boiling temperatures, while leaf drop with the re-formed oil treatment was intermediate between the above-mentioned 2 oils and the lighter naphthenic oil treatment. Leaf drop from trecs sprayed with the various oils was 37 to 65% greater than with the non-oil treatment, but in no case was it considered excessive.

Document Type: Research Article

Publication date: December 1, 1967

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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