. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. l62 Principles of Plant Culture. 312. Leaf=Miners often infest spinach and beets grown for greens, rendering the leaves unfit for use. For these insects we can offer no preventive measures of established value. The application of powerful odorants to the young foliage, as coal tar water or a solution of carbolic acid, may prove beneficial. 313. The Codling=Moth,* which causes so-called " wormy " apples and pears, is controlled by spraying
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. l62 Principles of Plant Culture. 312. Leaf=Miners often infest spinach and beets grown for greens, rendering the leaves unfit for use. For these insects we can offer no preventive measures of established value. The application of powerful odorants to the young foliage, as coal tar water or a solution of carbolic acid, may prove beneficial. 313. The Codling=Moth,* which causes so-called " wormy " apples and pears, is controlled by spraying the trees at the time of egg deposit, with water con- taining Paris green (285). The first spraying should be given as soon as the petals (143) fall, to be followed by a second six to ten days later. If much rain falls at this season, the sprayings may need frequent repetition. A drop of poison- ed water should be lodged in the calyx (142) of every fruit, and as this evaporates, the film of poison deposited on the skin intercepts the newly-hatched insect as it eats its way inward, and kills it. 314:. The Plum Curculio (306) that so often stings young plums, causing them to drop be- fore matur- ity, is con- trolled by jarring the beetles, that deposit their eggs in the young fruit, upon sheet-covered frames (Fig. 74), on cool, still mornings while the beetles are stiff. The jarring should * Carpocapm pomonella. >c:. Fig. 74. Fi-i. 73. Fig. 72. Fig 72. Card of tarred paper, for placing about the stems of youDg cabbage and caulittower plants. Keduced one-half. Fig. 73. Tool for cutting the cards. Fig. 74. Maaner of using the tool. The dotted lines show the position of the edge of the tool on the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. : E.
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