Leyland Cypress DiseasesNeedle Blight Cercospora
needle blight, caused by the fungus Cercosporidium sequoiae (syn. Asperisporium
sequoiae; Cercospora sequoiae), is a relatively new disease on Leyland cypress.
However, it a common disease on species of Juniperus, Thuja, Cupressus, Taxodium,
Cryptomeria, Sequoia and other genera. The first symptom of Cercospora needle
blight is a browning of the needles in the lower crown next to the stem. The
disease slowly spreads upward and outward until, in severe cases, only the
needles at the tips of the upper branches remain green. In a general way, these
symptoms mimic those caused by severe stress where the interior needles turn
yellow and fall off. Fruiting bodies of the fungus appear as tiny, greenish
pustules on the upper surface of the needles or on small twigs. Spores (conidia)
are present throughout the spring and summer and are spread by wind. Infection
usually occurs during periods of wet weather. Kocide 2000 is an advanced copper product. It utilizes a patented formulation to improve copper bioavailablity in order to optimize performance at lower usage rates. Kocide 2000 is dry flowable and disperses well in solution. It is as effective as other copper products, however, the volume of copper needed is reduced by up to 25%. Contains 53.8% cupric hydroxide (metallic copper equivalent: 35%). Published by
North Carolina Cooperative Extension Service Distributed in furtherance of the
Acts of Congress of May 8 and June 30, 1914. Employment and program
opportunities are offered to all people regardless of race, color, national
origin, sex, age, or disability. North Carolina State University at Raleigh,
North Carolina A&T State University, U.S. Department of Agriculture, and local
governments cooperating. |
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