The Plant as a Factor in the Action of Bordeaux Mixture as an Insecticide

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Tests with inverted petri dishes covered with capping membranes and containing sugar solutions or expressed plant juices showed that copper could be dissolved from Bordeaux mixture residues sprayed on the capping membranes. Distilled water, used in the same manner, gave negative results. Rain-water collected over a period of approximately three months and which had passed through glass funnels containing filter papers covered with Bordeaux mixture residue gave negative chemical tests for copper. Rain-water collected from plants sprayed with Bordeaux mixture and leaves containing Bordeaux mixture washed in water gave chemical tests for copper. Rain or dew is not necessary on the Bordeaux mixture sprayed plant in order to ki11leafhoppers.

Refractometer readings of sprayed and unsprayed plant juices showed that, as a rule, in vigorous growing plants the solid (sugar) content of the sprayed plants was lowered for about two days below that of the unsprayed plants but soon became higher and with few exceptions usual1y remained higher than that of the unsprayed plants for about two weeks.

Document Type: Research Article

Publication date: April 1, 1930

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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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