Immunization of Plants
IMMUNIZATION - The art of rendering a crop immune - that is, 100 per cent resistant - to attacks by specific organisms or pests generally established in an area. Natural immunity may be developed by selection and propagation of individuals which show marked resistance, or by crossing plants that are desirable but susceptible to a given trouble with less desirable but more resistant forms. Numerous attempts at artificial inoculations have been made on plants, but so far no success has been attained.
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ImmuneIMMUNE - Exempt from disease. A plant may be resistant to a disease in varying degrees, but immunity implies 100 percent resistance.
ImmortelleIMMORTELLE (i-mor-tel’). This, the French word for Everlasting, is especially applied in America to Xeranthemum annuum, but it is also used loosely for any of the kinds of flowers which are dried for use in winter bouquets.
ImbricariaIMBRICARIA (im-bri-kay’-ri-ah). A former name for the genus Mimusops, a group of tropical evergreen trees somewhat planted in the South for their thick shining foliage and sometimes edible fruit.
IlliciumILLICIUM (i-lis’-i-um). Evergreen trees and shrubs, belonging to the Magnolia Family, mostly of the Orient but one or two native in Southern US. They can be grown only in warm climates. Illicium anisatum, the principal species, is a small Japanese tree, with elliptic, aromatic leaves and yellowish-green flowers with many narrow petals. Illicium floridanum, native [...]
IlexILEX (y’-leks). A genus of evergreen and deciduous glossy leaved trees and shrubs, notable for their brilliantly colored berries and commonly called Holly. They range from hardy to quite tender, but wherever they can be grown the different species are highly ornamental for garden and lawn specimens besides having an inseparable association with the Christmas [...]
IdesiaIDESIA (y-dee’-zi-ah) polycarpa. An Oriental deciduous spreading tree with light gray bark, grown for its attractive red-stemmed lustrous foliage and racemes of orange-red berries which arc most conspicuous after the leaves fall. It is hardy in the South and seedlings have wintered well even in Massachusetts.
Ichneumon WaspICHNEUMON WASP - A parasitic insect that attacks caterpillars, though some kinds lay their eggs in the burrows of wood-boring larvae.
IbozaIBOZA (y-boh’-zah). A genus of African herbs or shrubs with small flowers grown outdoors in the South but in greenhouses elsewhere. When through blooming the plants may be cut back and treated like salvia, a closely related plant.
Iberis - From the Mustard FamilyIBERIS (y-bee’-ris). A genus of small to medium sized annual and perennial herbaceous plants of the Mustard Family, known to gardeners as Candytuft. Natives of Southern Europe, they are hardy and easy to grow, but the garden kinds are of two distinct types - annual and perennial.
