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Historical Documents of the Purdue Cooperative Extension Service Department of Agricultural Communication

January 2016

Lophodermium Needlecast

Paul C. Pecknold Purdue University, [email protected]

Follow this and additional works at: https://docs.lib.purdue.edu/agext

Pecknold, Paul C., "Lophodermium Needlecast" (2016). Historical Documents of the Purdue Cooperative Extension Service. Paper 1109. https://docs.lib.purdue.edu/agext/1109

For current publications, please contact the Education Store: https://mdc.itap.purdue.edu/ This document is provided for historical reference purposes only and should not be considered to be a practical reference or to contain information reflective of current understanding. For additional information, please contact the Department of Agricultural Communication at Purdue University, College of Agriculture: http://www.ag.purdue.edu/ agcomm This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact [email protected] for additional information. BP-52

Lophodermium Needlecast

Paul C. Pecknold, Extension Plant Pathologist

The traditional of diseased to healthy needles. Most Indiana, Scotch , is frequently release occurs in September. If apt to have lower needles which weather conditions are favorable, brown and drop. This problem is once a spore lands on a needle it will often caused by a fungal disease germinate and cause infection; known as Lophodermium however, needle infection will not be needlecast. Though the disease is noticed until the following spring only rarely important under forest when trees begin to brown and drop conditions, it can cause severe loss needles. in nursery operations and Christmas tree plantations. It may also cause unsightly damage to Scotch pine Symptoms grown for ornamental purposes or The browning of needles on lower as windbreaks. branches first appears in early spring (April-May). The most common cause of brown foliage in spring is winter Cause burn. Therefore, carefully examine the Ornamental Lophodermium needlecast is affected trees before reaching caused by the conclusions on the cause of the Diseases Lophodermium pinastri. During damage. Winter burn usually occurs rainy weather in August, Septem- on the windward side of trees and ber, and October, windborne affects the tops of the trees, with of the fungus are carried from foliage that was under snow remain-

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Figure 1. Needles brown in spring; injury is most severe on lower branches. ing green and healthy. Good weed control is critical. Do infected plantings an additional Lophodermium usually occurs in a not allow weeds or tall grass to grow spray may be required in late random pattern on all sides of the up around trees. Avoid planting next September or early October, tree and damages the lower branches to Scotch pine windbreaks which especially if wet weather prevails while the upper foliage remains may serve as a source from which during this period. Conversely, in green (Figure 1). disease can spread. When harvesting lightly infected plantings, the initial, Small, yellow-brown, bar-like trees, do not leave live branches or late July, spray may be omitted if spots form on needles which soon stumps; they also may serve as a dry weather prevails at this time. turn brown and drop. It is this stage disease source in following years. Note: Studies show September to be which refers to the name Chemical controls: Both the key month in which maximum “needlecast.” The current season’s mancozeb (Dithane) and spore release and infection occur. growth will not show damage but chlorothalonil (Bravo, Daconil ) are remain a healthy, green appearance registered for control of as contrasted to the dead, brown Lophodermium needlecast. If interior needles of previous years’ mancozeb is used, include a growth. Fruiting bodies of the spreader-sticker to obtain adequate fungus develop on fallen needles coverage. A spreader-sticker is not References to products in this over the summer. They appear as needed with chlorothalonil. Follow publication is not intended to raised, black, football-shaped all label instructions regarding be an endorsement to the structures which may be scattered amounts of pesticide to use, method exclusion of others which may along the length of the needle or of application, and safety warnings. be similar. Persons using such form in linear rows (Figure 2). Timing of spray applications is products assume responsibility critical. Infected plantings should be for their use in accordance sprayed three times, beginning in with current label directions of Management late July, in mid-August, and again the manufacturer. Early detection and prompt in mid-September. In severely application of control measures can prevent severe damage from occurring. A close inspection of plantings in spring will help locate possible trouble spots where control measures should be focused. Cultural controls: Start with disease-free planting stock. If needlecast has been a problem, do not grow the short-needled “Span- ish” Scotch pine and “French Green” varieties which are particu- larly susceptible. If possible, avoid planting in fog prone or low areas with poor air drainage.

Figure 2. Mature spore-producing bodies are football-shaped.

REV 6/96 (2M) This material may be available in alternative formats. Cooperative Extension work in Agriculture and Home Economics, state of Indiana, Purdue University, and U.S. Department of Agriculture cooperating; H. A. Wadsworth, Director, West Lafayette, IN. Issued in furtherance of the acts of May 8 and June 30, 1914. The Purdue University Cooperative Extension Service is an equal opportunity/equal access institution. 3