... Pycnia produce tiny, pear-shaped pycniospores that are exuded in a drop of yellow-orange fluid. Cronartium ribicola (White pine blister rust); the primary hosts are currants, and white pines the secondary. Other information. Quince rust 3. They can live for hundreds of years sometimes. Pears are amazing trees with an untapped potential. 32a) and Bastard toadflax (Geocaulon lividum (Richardson) Fernald) (Fig. (Fig. It infects white, or five-needle, pines and herbaceous plants in the genus Ribes, such as currants and gooseberries. Hosts: The aecial hosts are 2- and 3- needle hard pines, including lodgepole and ponderosa pine, The telial hosts are California Comandra (C. umbellata (L.) Nutt.) A table displaying which months are best to sow, plant and harvest. Jan … They are true magnets for wildlife. Wetwood of elm 10. Eastern gall rust of pine 7. The alternate host plant, Eastern red cedar (Juniperus virginiana ), is necessary for the survival of the fungus. Tuesday, 5 March, 2019 at 3:00 pm . This digital image gallery examines natural autofluorescence in plant tissue thin sections using multiple excitation with laser scanning confocal microscopy. Protect the foliage of your pear trees from damage by pear leaf blister mite. White pine blister rust 6. Cause Cronartium ribicola, a fungus that attacks both wild and cultivated species of gooseberry and currant.Black currant (Ribes nigrum) is more susceptible than red currant (R. sativum).Red currant cultivars Viking and Red Dutch are practically immune. Cedar-apple rust 4. Oak wilt 11. Atropellis piniphila is often associated with stalactiform blister rust cankers. All pears b pear-shaped aeciospores of C. comandrae). Cronartium coleosporioides can be distinguished from C. comandrae by its more elongate cankers, and more precisely by its ellipsoid aeciospores (cf. Cedar-apple rust definition is - a gall-producing disease especially of the apple caused by a rust fungus (Gymnosporangium juniperi-virginianae) that completes the first part of its life cycle on the common red cedar (Juniperus virginiana) and the second on the leaves and fruit of the apple. Pears (pryus spp.) Verticillium 12. Willow black canker 15. Autofluorescence in plant tissues arises from a variety of endogenous biomolecules that absorb light in all regions of the visible light spectrum. Comandra Blister Rust. Pear leaf blister mite. White pine blister rust, caused by the fungus Cronartium ribicola, requires two different hosts to complete its life cycle. Hosts As described on the main Rusts page , most rusts are heteroecious, alternating between two unrelated hosts in … Cedar-apple rust is the most common of the three fungal rust diseases and attacks susceptible cultivars of apples and crabapples. Genomics of White Pine Blister Rust; Pear Genomics Project (PGP) Walnut Genome and Molecular Breeding (WGMB) Silver Fir Genome Project (SFGP) PineRefSeq Project; American Beech Bark Disease Genome Project (ABBDGP) White Pine Genome & White Pines Resequencing Project (WHISP/WPGP) Poplar Biofuels Genome Project (PBGP) See: Pine, White-White Pine Blister Rust. Juniper rust 5. rust 2. Pear leaf blister mite; This competition is now closed. White Pine Blister Rust (WPBR) White pine blister rust is one of the most important forest diseases and certainly deserves its own page! Phomopsis canker of Russian olive 16. Phloem necrosis of elm 8. Mimosa wilt wilt of maple 13. And of course, pears can be cultivated into fruit trees for an orchard or yard. Fire blight of hawthorn 14. Other Cronartium rusts. Dutch elm disease 9. Cronartium comandrae Peck. 32b). It infects the leaves, fruit, and, occasionally, young twigs. 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