Cette référence complète fournit des informations pratiques et scientifiques sur l'horticulture, en se concentrant sur la culture des fruits et légumes. Il comprend des conseils détaillés sur les insectes bénéfiques comme Scutellista cyanea, un parasite des insectes écailleux.
1297 x 1927 px | 22 x 32,6 cm | 8,6 x 12,8 inches | 150dpi
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. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. BENEFICIAL INSECTS 617. Fig. 6. The Scutellista (Scutellista cyanea Motsch. [Family Encyrtidae]). The adult is a small four-winged parasite, less than one- eighth of an inch long, robust and metallic steel-blue to nearly black in color. The small oblong white eggs are placed under the shell of the black scale. They are somewhat larger than the eggs of the scale and hatch in from five to six days into crescent-shaped white legless larvae, which feed upon the eggs of the black scale for 15 to 20 days, when they pupate and after another like period emerge as adults from the shells of the scale through circular holes cut for this purpose. The adult lives a little over a week. It does very effective work on the black scale in certain sections. It also works on the hemispherical scale. itself readily to explanation but is a case of knowing "when to" and "when not to, " as each species requires different care, treatment and temperature. At the Insectary we propagate on vari- ous host plants, the destructive forms upon which we feed the beneficial forms that later on are distributed to the or- chards. The several pictures accompanying this article will give the reader an idea of the manner in which this work is carried on. Still another very interesting phase of the work is the conservation and dis- tribution of native species of beneficial insects. Many native species propagate or hyber- nate in immense quantities in certain sec- tions of the state, which are collected when available, held in a state of artifi- cial hibernation by the aid of cold storage, later to be judiciously distributed into new sections, where they will thrive and perform wonderful service in destroying destructive forms which are pres
