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Three Years of Paradichlorobenzene Experiments in the South

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Paradichlorobenzene treatment of peach trees for control of the peach borer, Aegeria exitiosa Say, has become an annual practice in the program of orchard management in Georgia. Five hundred thousand pounds of the material were used in the Southeast during the 1923 season. The results of experiments indicate that under normal conditions the large doses exposed for short periods are not as effective as the smaller doses exposed for four to six weeks. No tree injury resulted from the use of the various doses around three, four and five year old peach trees in Georgia during 1921 and 1922 when normal weather conditions prevailed. However, during the 1923 season a precipitation deficiency occurred accompanied by abnormally high temperatures. These unusual weather conditions caused rapid action from the gas, and as a result some rather severe injury has shown up on three year old trees from the use of the ¾ and one ounce dose. During each of the three years no injury has resulted from the use of the ¾ ounce dose around four and five year old trees for twenty eight days. One and two year old trees have shown, each year, more or less injury from the use of the ½ and ¾ ounce dose. To date no injury has been revealed from allowing the mounds to remain around the trees over winter. Late October and November applications of paradichlorobenzene gave a control of around seventy-five per cent. December applications were worthless. Applications made around April 1st in Georgia gave about seventy pet cent control. Laboratory experiments show that the gas is liberated at about the same rate in both sandy loam and clay soils. Tests in the laboratory have repeatedly shown that the higher the moisture content of the soil and the lower the temperature, the slower is the action of the gason the borer.

Document Type: Research Article

Publication date: April 1, 1924

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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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