fruiting bodies develop on the needles. Rhizosphaera Pycnidia In rows of stomates with smooth, small spores that makes sporodochia look fuzzy. The Colorado Blue spruce is most susceptible, followed by Englemann, white and Norway spruce. X2�N�� vX�0�c�/00�chr`.`�S������%�Ề����?\�����^?������������� �Ij��*'��]`|���(}@���
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If you have seen trees affected by needle cast disease in the area, avoid planting this highly susceptible tree. The disease occurs statewide, but is more common in the northern part of the state. 0000001231 00000 n
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CAUSE: Rhizosphaera needle cast is a very significant disease of landscape, nursery and plantation conifers. This genus also infects several conifer species including; fir, cedar, spruce, and pine Rhizosphaera needle cast is a foliar disease that occurs worldwide on a diverse range of conifers. [�~J��iV�K$Z���Ԁ (Print friendly PDF) Rhizosphaera needle cast, a fungus disease caused by Rhizosphaera kalkhoffii, is primarily a disease of blue spruce (Picea pungens) trees in New Mexico, though it can affect other conifers, such as ponderosa pine, Japanese black pine, and Douglas fir. 0000032770 00000 n
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Spruce in both urban and rural landscapes can be affected. Trees stressed from drought, poor planting practices or other factors are more likely to suffer from Rhizosphaera needle cast. Young trees sustain the most severe damage, but trees of any size can be affected. 0000052806 00000 n
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Rhizosphaera needle cast is caused by fungal pathogens within the genus Rhizosphaera. /Contents 136 0 R
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Before planting, check suspect needles for fruiting bodies by following the method outlined above. /Type /Page
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Needle Cast Symptoms & Signs Needle cast disease, caused by the fungus Rhizosphaera sp., results in purple to brown discoloration of scattered needles and eventual needle cast (needle drop) (Figure 1). endobj
Branches that lose first year needles for 3 to 4 consecutive years may die. 0000053143 00000 n
Colorado and Engelmann spruce are very susceptible, but Norway and white spruce are somewhat resistant. 391 ] 410 [ 335 ] 437 [ 525 ] 448 [ 452 715 ] 454 [ 433 453 ] 460 [ 395 ]
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CAUSE: Rhizosphaera needle cast is a very significant disease of landscape, nursery and plantation conifers. /CIDSystemInfo 116 0 R
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Needles are cast in summer. If your tree has this pattern of needle loss, use a 10X hand lens to observe the shed needles. 0000316076 00000 n
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