Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 THE INSECT WORLD. '3 cases, instead of a female, an egg mass will be found beneath the scale ; but in either case mechanical dislodging results in the de- struction of the insects. Very often a little judicious ^'*^' ^5- pruning or trimming, done during the winter, will give relief, because the insects usually settle on the termi- nal twigs, and it might easily be that none of the larger branches contai
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 THE INSECT WORLD. '3 cases, instead of a female, an egg mass will be found beneath the scale ; but in either case mechanical dislodging results in the de- struction of the insects. Very often a little judicious ^'*^' ^5- pruning or trimming, done during the winter, will give relief, because the insects usually settle on the termi- nal twigs, and it might easily be that none of the larger branches contained living scales or eggs. In conservatories the mechan- ical method is, all things considered, the best. It may take a little more time, but it is thoroughly effect- ive, and when carefully done there may be almost total exemption until scales are again introduced with new plants. This is a good place to say that no plant should be placed in a garden or con- servatory until it has been thoroughly cleaned of all scales found on twig or fo- liage, and a soft tooth- or hand-brush, with moderately strong soapsuds, forms a good outfit for doing the work. Where winter treatment is inadvisable or impossible, applications should be made when the larvae emerge from the eggs and before they fasten themselves to leaves or twigs. There is no difficulty in killing the young with either soapsuds or kerosene emulsion, but—and here is the important point—the application must be made before the insect is pro- tected by a scale, or when the scale is yet very thin and newly- formed. Kerosene will penetrate the waxy mass of the maple scale, but it will not certainly kill the eggs contained in it ; yet Lecamum hemispliericum, on orange-leaves, nat- female scale, enlarged. ural size ;
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