. Roses, and how to grow them; a manual for growing roses in the garden and under glass ... a soap, or a tobacco emulsion, a strong tobacco decoc-tion, or whale-oil soap (one pound in six toeight gallons of water), will kill all that arewet with the spray, but it is practically impos-sible to hit them all with one application, andthey develop so rapidly that usually it isnecessary to repeat the dose several timesduring the season. Either of these sprayswill doubtless kill any slugs that may be atwork at the same time. WATER AND POISONS AS REMEDIES If a strong water pressure is a
. Roses, and how to grow them; a manual for growing roses in the garden and under glass ... a soap, or a tobacco emulsion, a strong tobacco decoc-tion, or whale-oil soap (one pound in six toeight gallons of water), will kill all that arewet with the spray, but it is practically impos-sible to hit them all with one application, andthey develop so rapidly that usually it isnecessary to repeat the dose several timesduring the season. Either of these sprayswill doubtless kill any slugs that may be atwork at the same time. WATER AND POISONS AS REMEDIES If a strong water pressure is available, onecan often master all of these serious enemiesof the garden rose bush with the hose anda coarse spray nozzle, by simply knocking offthe insects with a spray every few days. In trying poisons, remember that rosefoliage is tender and may be injured by strongmixtures. Very common is the bark louse, which sur-vives the winter and is usually found on oldwood. It can best be treated before growthbegins in the spring and can be removed byscrubbing with a tooth-brush and a plentiful. INSECTS, DISEASES AND SPRAYING 51 supply of soap and water. Kerosene emul-sion is of course a proper remedy for this, too. The rose is just as likely as any other plantin the garden to be attacked by the San Josescale, and must be treated similarly to otherinfected plants. The lime-sulphur-salt washis found to be superior to all other remediesyet tried. An objection to this lies in thewhitewashed effect given to the plants, butthe addition of lamp black to the mixturetones down the colour to a dark greenishgrey, which in the garden is worth the littleextra trouble involved. Sometimes curious half-circular pieces arecut out of rose leaves by the leaf-cutter bee,which deftly makes them into long tubes con-taining several cells in which its young aredeveloped. DISEASES The rose is subject to a hundred or morefungous diseases, the majority of which, hap-pily, are not serious obstacles to the garden
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