When irrigating, use drip irrigation instead of overhead sprinkling and avoid irrigating in the late afternoon or evening. Provide appropriate cultural care to encourage vigorous plant growth. To minimize needle blights, choose a planting site with good air circulation and avoid planting conifers too close together. For example, in some needle casts, infection is frequently restricted to the newly developing needles, and sporulation is timed to coincide in spring with needle development. Successful infection depends on favorable conditions. Sporulation, spread, and infection by these fungi are frequently restricted to a specific season, such as spring, summer, or fall. These fungi often have life cycles that are timed with the growth and development of the host and may require 1, 2, or more years to complete. In other conifers, Herpotrichia juniperi ( =H. Brown felt blight of pines is caused by Neopeckia ( =Herpotrichia) coulteri. Unlike other needle cast fungi that develop in foliage, Elytroderma infection becomes systemic and persists in branch tissue, and it can seriously damage pines.Īll conifers are susceptible to brown felt blight, or "snow mold." Needles buried under snow die in dark brown to gray masses matted together with fungal mycelium. Cercospora needle blight, Cercospora sequoiae, affects coast redwood after warm, wet conditions.Įlytroderma disease caused by Elytroderma deformans affects only pines, commonly those grown alongside lakes and streams. For example, Douglas-fir needle cast, Rhabdocline spp., affects only Douglas-fir, and mostly those in the North Coast. Most needle fungi infect only one or several related conifers and can be identified by their host and characteristic spore-forming structures on dying and dead needles. Even when environmental, plant, and fungal characteristics coincide to favor needle disease, usually only the foliage produced during a single season is damaged or drops prematurely, so trees rarely suffer severe stress or are killed. Needle blight and cast-Various fungi including Elytroderma, Lophodermella, Lophodermium, Phaeocryptopus, Rhabdocline, and Rhizosphaera spp.įungi that cause needle blight (dieback) and cast (premature drop) are weak pathogens. The conidial density and percentage germination of D.
#Needle blight how to#
How to Manage Pests Pests in Gardens and Landscapes migulanus Nagano reduced Dothistroma needle blight (DNB) severity to 1.1 0.4. UC IPM Home > Homes, Gardens, Landscapes, and Turf > Trees and Shrubs > Diseases
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