It is most common on Colorado blue spruce. Linda: Rhizosphaera needlecast does very well during wet years. Management • Management is not necessary on spruce with healthy crowns. Page 2 of 4 Rhizosphaera and stigmina needlecast of spruce Both of these fungal diseases cause purpling, then death and dropping of second year and older spruce needles. Keep in mind that there may be more than one problem on a tree. The disease, referred to as Rhizosphaera needle cast, is the most common problem seen on blue spruce samples that are submitted to the Plant Disease Clinic. Rhizosphaera needle cast is the best-known of these diseases, but another fungal disease known as Stigmina needle cast, caused by Stigmina lautii, has also been common and causes the same type of symptoms. Find them at the tips of new growth. Non-native blue spruce are most heavily impacted by needle diseases, particularly Rhizosphaera needle cast. Colorado Blue Spruce Problems. Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. Last year (2017) was a very wet year all throughout the … • Eastern spruce galls mainly affect Norway and white spruce. From a distance, the tree looks healthy with vigorous growth. But upon closer inspection (Photo 3), there are sections of needlecast and branch death around the base of the tree that are beginning to become noticeable, hence the reason the photos were taken in 2009. All these species are classified into three clades, as given below. Clade I. Brewer’s spruce (Picea breweriana)Sitka spruce (Picea sitchensis); Engelmann spruce (Picea engelmannii); White spruce … Avoid planting spruce in heavy shade. Find the pineapple-shaped galls at the base of new shoots. In Photos 4 and 5, … The Picea genus includes thirty-five extant species, out of which the Brewer’s spruce has a basal position, after that come the Sitka spruce, and then the other species. Prune out green galls on small spruce. In Photos 1 and 2, you can see a Colorado blue spruce from its east and west aspects in July 2009. • Cooley spruce galls are mainly on Colorado blue spruce and white spruce. Infection, which begins in spring, usually appears first scattered among the lower branches and may cause severe loss of needles. Rhizosphaera often accompanies other problems. FORESTRY IVISION … Blue spruce trees are much more susceptible to the disease than white spruce, but we’re seeing heavily impacted white spruce this year too. The Colorado blue spruce, or Picea pungens, is a favorite choice for Christmas trees as well as a robust and substantial addition to a landscape. List of Different Types of Spruce Trees. White spruce are classified as intermediate in susceptibility to the disease and Norway spruce are relatively resistant. 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