Hemiptera plant. Phloem sap, which has a higher concentration of sugars and nitrogen, is under positive pressure unlike the more dilute xylem sap. Most of the Sternorrhyncha and a number of Auchenorrhynchan groups feed on phloem. Phloem feeding is common in the Fulgoromorpha, most Cicadellidae and in the Heteroptera. The Typhlocybine Cicadellids specialize in feeding on non-vascular mesophyll tissue of leaves, which is more nutritious than the leaf epidermis. Most Heteroptera also feed on mesophyll tissue where they are more likely to encounter defensive secondary plant metabolites which often leads to the evolution of host specificity. Obligate xylem feeding is a
Irving Tissue use of the tissue produced in Saint John. Irving began producing private label tissue products and the Majesta brand was launched in Canada. In 1996, Irving acquired another tissue paper mill from Kimberly-Clark as well as a tissue converting plant, both located in Fort Edward, New York. Part of this acquisition saw Irving Tissue receive the right to market its products under the Scotties Facial Tissue brand in the United States. In 2001, J.D. Irving acquired a tissue production and converting plant in Toronto from Procter & Gamble. This acquisition saw Irving Tissue receive the right to market the Royale