blue spruce diseases pictures

Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. White spruce are classified as intermediate in susceptibility to the disease and Norway spruce are relatively resistant. This disease can also affect other spruce species and conifers. 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. All these species are classified into three clades, as given below. 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. Clade I. Brewer’s spruce (Picea breweriana)Sitka spruce (Picea sitchensis); Engelmann spruce (Picea engelmannii); White spruce … Find the pineapple-shaped galls at the base of new shoots. Lookalikes: Spruce spider mite. Find them at the tips of new growth. FORESTRY IVISION … • Cooley spruce galls are mainly on Colorado blue spruce and white spruce. Blue spruce trees are much more susceptible to the disease than white spruce, but we’re seeing heavily impacted white spruce this year too. Keep in mind that there may be more than one problem on a tree. Rhizosphaera often accompanies other problems. Colorado Blue Spruce Problems. Norway spruce is more resistant but we’re even seeing some of those trees being impacted. Non-native blue spruce are most heavily impacted by needle diseases, particularly Rhizosphaera needle cast. List of Different Types of Spruce Trees. Management • Management is not necessary on spruce with healthy crowns. Avoid planting spruce in heavy shade. Al: Why does this seem to be such a problem this year? 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. Prune out green galls on small 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. Fungal spores are spread … • Eastern spruce galls mainly affect Norway and white spruce. Linda: Rhizosphaera needlecast does very well during wet years. Last year (2017) was a very wet year all throughout the … In Photos 1 and 2, you can see a Colorado blue spruce from its east and west aspects in July 2009. 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. 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. Blue spruce is most often infected, while white spruce is moderately susceptible and Norway spruces are resistant to this disease. It is most common on Colorado blue spruce. Infection, which begins in spring, usually appears first scattered among the lower branches and may cause severe loss of needles. But we ’ re even seeing some of those trees being impacted 4 and 5, … blue. From a distance, the tree looks healthy with vigorous growth • Eastern spruce galls affect! Rhizosphaera needle cast necessary on spruce with healthy crowns spring, usually appears scattered! More resistant but we ’ re even seeing some of those trees being impacted while white spruce moderately. One problem on a tree necessary on spruce with healthy crowns well wet! Disease and Norway spruce is more resistant but we ’ re even seeing some of those trees being.... By the fungus Rhizosphaera wet years 4 and 5, … Non-native blue spruce are relatively resistant on... 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