. The book of the garden. Gardening. BRASSICACEOUS PLANTS.—THE BORECOLE. in microscopes, are often a scourge to man. Whole crops of Brassicae have often been completely destroyed by their united force. The only re- medy at present known is caustic lime in fine powder, or clarified lime-water, administered to the plants upon the first appearance of the fungi, and continued vigorously until its disap- pearance. An interesting account of these pa- rasites -will be found in the third volume and also in the sixth volume of the " Journal of the London Horticultural Society," to which the c
. The book of the garden. Gardening. BRASSICACEOUS PLANTS.—THE BORECOLE. in microscopes, are often a scourge to man. Whole crops of Brassicae have often been completely destroyed by their united force. The only re- medy at present known is caustic lime in fine powder, or clarified lime-water, administered to the plants upon the first appearance of the fungi, and continued vigorously until its disap- pearance. An interesting account of these pa- rasites -will be found in the third volume and also in the sixth volume of the " Journal of the London Horticultural Society," to which the cryptogamic reader is respectfully referred. The EryHphe comimmis (Link, common mildew) is often found on the leaves, more especially in dry weather, for which an efficient remedy has been discovered in flowers of sulphur, thrown over the plants by one of the newly-invented Bulphurators. The most fatal disease, however, the Brassioa family is liable to, is what is called the club in the root, from the many swellings or tubercles formed upon it, varying in size from half an inch in diameter to two or three. This is the pro- duction of the larvse of Ov/rcidio contractus of Marsham, which, piercing the skin of the root, deposits its eggs in the hole, lives during a time on the sap of the plant, and then escapes and buries itself for a time in the soil. Frequent transplanting seems to be the first remedy, be- cause by it the plants acquire numerous roots to throw strength into the plant; the next is to draw up every plant affected, and consign it to the flames; the third is next to useless, namely, cutting off the protuberances and retaining the plants. The first has this advantage, that whUe it greatly encourages lateral roots, the grub pre- ferring those that are ramose, parts of these may be removed, while, at the same time, the others are throwing in support to the plant, enabling it to outgrow the disease. Renewal of soil is im- portant, while the application of the whole lis
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
