Second report on economic zoology / by Fred. V. Theobald.

  • Theobald, Frederick V. (Frederick Vincent), 1868-1930.
Date:
1904
Catalogue details

Licence: In copyright

Credit: Second report on economic zoology / by Fred. V. Theobald. Source: Wellcome Collection.

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    churn the whole together for ten minutes, and dilute when used with ten times the amount of soft water. “ For combined wash that will destroy sucking and biting-mouthed insects, mix two pints of the concentrated paraffin emulsion with the arsenate of lead wash. “ You cannot combine Bordeaux mixture with Paris green and paraffin emulsion; you can combine it with Paris green alone. Nor can you mix Paris green and liver of sulphur, or Paris green and soft soap washes. “ Arsenate of lead you can mix with Bordeaux mixture, and paraffin emulsion and quassia washes; thus you get a good wash, combined of a fungicide and the two chief insecticides. This may also have liver of sulphur added for Bed Spider and Mites, but it is not advisable to do so. “ Paranaph may, of course, be substituted for paraffin emulsion.” Mr. Town Smith writes that “ we have used Paris green with soft soap wash or paranaph with care—2 ozs. Paris green, 40 gallons water and soft soap wash—without marked damage to the trees.” Mr. Cecil Hooper, of Swanley, on the other hand, writes that he has “ used soft soap and Paris green, and that he found the foliage burnt.” The mixture is certainly not good. Mr. Hooper also writes as follows:—“ I have also used Paris green and Bordeaux mixture; but I find this mixture a good deal of trouble, but I believe it to be a good thing.” I do not think a good wash can possibly be made out of the two. Painting Fruit Trees. Mr. J. Le Feaver, of Stile Bridge, Marden, wrote asking for the best paints to use for fruit trees during the winter for destroying insects. The best mixtures to whitewash fruit trees with are the following:— 1. Lime and water made into the consistency of a fine paint, and to every ten gallons of this add one pint of paraffin. 2. Fine clay made into a thin paint. To every gallon add half a pound of liver of sulphur. 3. But best of all is washing the trees with caustic alkali wash in winter. By so doing not only is healthy bark produced, but Mussel Scale, Woolly Aphis, Codling Maggot, Thrips, and many other pests are destroyed.