Seasonal photosynthate allocation of the Californian coast live oak Quercus agrifolia

1987 ◽  
pp. 437-444 ◽  
Author(s):  
Y. Mauffette ◽  
W. C. Oechel
Keyword(s):  
Quercus Agrifolia ◽  
Live Oak ◽  
Photosynthate Allocation

Identification and pathogenicity of Botryosphaeriaceae species associated with coast live oak (Quercus agrifolia) decline in southern California

Mycologia ◽  
2013 ◽  
Vol 105 (1) ◽  
pp. 125-140 ◽  
Author(s):  
Shannon C. Lynch ◽  
Akif Eskalen ◽  
Paul J. Zambino ◽  
Joey S. Mayorquin ◽  
Danny H. Wang
Keyword(s):  
Southern California ◽  
Quercus Agrifolia ◽  
Live Oak ◽  
Botryosphaeriaceae Species

Phytophthora ramorum. [Distribution map].

2006 ◽  
Author(s):  
Keyword(s):  
South Carolina ◽  
Phytophthora Ramorum ◽  
Distribution Map ◽  
Quercus Agrifolia ◽  
Quercus Kelloggii ◽  
Live Oak ◽  
Lithocarpus Densiflorus ◽  
Black Oak ◽  
New Distribution ◽  
Distribution In Europe

Abstract A new distribution map is provided for Phytophthora ramorum Werres, de Cock & Man in't Veld. Oomycota: Pythiales. Hosts include California black oak (Quercus kelloggii), California live oak (Quercus agrifolia), Rhododendron, shreve oak (Quercus parvula var. shrevei), tanoak (Lithocarpus densiflorus) and Viburnum. Information is given on the geographical distribution in Europe (Belgium, Denmark, France, Germany, Ireland, Italy, Netherlands, Norway, Poland, Slovenia, Spain, Sweden, Switzerland, UK) and North America (Canada (British Columbia), USA (California, Florida, Georgia, Louisiana, Oregon, South Carolina, Tennessee, Virginia, Washington)).

Reproduction and Control of the Invasive Polyphagous Shot Hole Borer, Euwallacea nr. fornicatus (Coleoptera: Curculionidae: Scolytinae), in Three Species of Hardwoods: Effective Sanitation Through Felling and Chipping

2020 ◽  
Vol 49 (5) ◽  
pp. 1155-1163 ◽  
Author(s):  
Yigen Chen ◽  
Tom W Coleman ◽  
Adrian L Poloni ◽  
Lori Nelson ◽  
Steven J Seybold
Keyword(s):  
United States ◽  
Cryptic Species ◽  
Ecological Impact ◽  
Complete Elimination ◽  
Quercus Agrifolia ◽  
Environmental Threat ◽  
Live Oak ◽  
Hardwood Trees ◽  
Platanus Racemosa ◽  
And Control

Abstract The invasive ambrosia beetle polyphagous shot hole borer is one member of the cryptic species, Euwallacea nr. fornicatus (Eichhoff), and poses a great ecological and environmental threat to ornamental and native hardwood trees and agriculturally important tree crops in southern California, United States. We monitored the emergence of polyphagous shot hole borer adults from chipped and unchipped cut logs of infested boxelder, Acer negundo L. (Sapindales: Sapindaceae), California sycamore, Platanus racemosa Nutt. (Proteales: Platanaceae), coast live oak, Quercus agrifolia Née (Fagales: Fagaceae), and red willow, Salix laevigata Bebb (Malpighiales: Salicaceae), every week for 4 to 5 mo. No polyphagous shot hole borer adults emerged from chipped or unchipped coast live oak logs, suggesting this species is not a preferred reproductive host. However, following chipping, a small number of polyphagous shot hole borer adults emerged from boxelder (up to 7 wk) and from California sycamore and red willow (both up to 9 wk). A significantly greater number of polyphagous shot hole borer adults emerged from unchipped logs of boxelder (up to 14 wk) and California sycamore and red willow (both up to 5 mo). Chipping of boxelder, California sycamore, and red willow by using common commercially available chippers reduced polyphagous shot hole borer emergence by over 97%. Emerged polyphagous shot hole borer adults were strongly female-biased, regardless of host. Chipping treatments were highly effective, but for the complete elimination of polyphagous shot hole borer from woody material, other sanitation measures such as solarization in conjunction with chipping are recommended. Environmental and ecological impact of polyphagous shot hole borer is reviewed and discussed.

scholarly journals 815 PB 228 THE EFFECT OF PRUNING ON BRANCH GROWTH IN TWO OAK SPECIES

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 550b-550
Author(s):  
A. James Downer ◽  
Matthew Shaw ◽  
Dennis Pittenser
Keyword(s):  
Growth Reduction ◽  
White Oak ◽  
Quercus Agrifolia ◽  
Apical Meristems ◽  
Branch Growth ◽  
Live Oak ◽  
Landscape Trees ◽  
Pruning Techniques

Coast Live Oak (Quercus agrifolia) and White oak (Q. lobata) are landscape trees which are prone to sudden branch drop. The purpose of this work was to determine the effect of various pruning techniques on growth reduction of one member of a pair of codominant stems. Forty trees of each species were selected with codominant stems. One stem of each pair was pruned by: 1. removing all apical meristems; 2. thinning 50% of branches; 3. heading back to a 10cm stub or, 4. unpruned. Calipers of thinned or headed branches were most retarded while tipped and unpruned branches grew most. Results suggest that pruning by thinning may be an alternative to removal of codominant branches when training young trees.

scholarly journals First Report of Bot Canker Caused by Diplodia corticola on Coast Live Oak (Quercus agrifolia) in California

Plant Disease ◽  
2010 ◽  
Vol 94 (12) ◽  
pp. 1510-1510 ◽  
Author(s):  
S. C. Lynch ◽  
A. Eskalen ◽  
P. Zambino ◽  
T. Scott
Keyword(s):  
San Diego ◽  
Tree Mortality ◽  
Western Mediterranean ◽  
San Diego County ◽  
Lesion Length ◽  
Petroleum Jelly ◽  
Necrotic Tissue ◽  
Quercus Agrifolia ◽  
First Report ◽  
Live Oak

Sharp decline and mortality of coast live oak (Quercus agrifolia) has been observed in San Diego County, CA since 2002. Much of this decline has been attributed to a new pest in California, the goldspotted oak borer (GSOB, Agrilus coxalis) (1). Symptoms include crown thinning, bark cracking and/or peeling, patches of stain (1 to 10 cm in diameter), bleeding on the bole, and tree death and are most often observed on trees with a diameter at breast height (DBH) >30 cm. In 2008, a Botryosphaeria sp. was recovered from necrotic tissue of bleeding bole cankers from GSOB-affected trees in Jamul, CA. Zone lines separated dead and live tissue in affected phloem and xylem. Pycnidia were observed on the bark surface of the infected host. Fifty conidia averaging 32 × 18 μm, one-septate with age, and morphologically similar to conidia described by Úrbez-Torres et al. were observed (4). Oak stands with tree mortality were surveyed in GSOB-infested and -uninfested sites over eight locations throughout San Diego and Riverside counties in 2009 and 2010. Symptomatic tissue or conidia from pycnidia of affected trees, plated onto potato dextrose agar amended with 0.01% tetracycline and incubated at 25°C for 1 week, consistently produced cultures with dense, wooly, olive-green mycelium. Mycelia fit the description of Botryosphaeria corticola A.J.L. Phillips, Alves et Luque (anamorph Diplodia corticola) (2). The resulting amplified ITS4/5 region of two sequences matched 100% to published D. corticola sequences (GU799472 and GU799460) (4). These sequences were deposited with NCBI GenBank (HM104176 and HM104177). Koch's postulates were conducted by inoculating 2-mm-diameter holes on five coast live oak trees with D. corticola. Holes were drilled to the cambium at 2 to 4 locations per tree within 1 to 2 m up the bole using a 0.157-cm portable electric drill. Trees ranged from 3.7- to 32.4-cm DBH. Either single agar plugs from two isolates each of a 7-day-old culture (UCR454 and UCR793) or noncolonized agar plugs as uninoculated controls were inserted into the holes and then covered with petroleum jelly and Parafilm. Average temperature was 10°C, relative humidity of 64%, and no precipitation during inoculation. Inoculations were conducted at a location in San Diego County uninfested by GSOB and repeated twice. After 3.5 months, bark was removed from inoculation sites. Average lesion length was not significantly different between inoculations, thus data were combined (one way analysis of variance [ANOVA]; P = 0.05). Lesions averaged 13.9 × 2.3 cm and were significantly different (n = 30; one way ANOVA; P = 0.05) from controls that measured 0.31 × 0.3 cm. Staining was observed around the inoculation points on all trees and three trees exhibited bleeding. Necrotic tissue was observed in the phloem and 3 mm into the xylem tissue, where the lesion had extended up and down the grain. D. corticola was consistently reisolated from necrotic tissue but not from control treatments. B. corticola was originally described as a canker pathogen on Quercus spp. in the western Mediterranean (2), and is known to contribute to the decline of cork oak (Q. suber) in the region (3). To our knowledge, this is the first report of D. corticola causing bot canker on coast live oak in California. References: (1) T. W. Coleman and S. J. Seybold. U. S. For. Serv. R5-PR-08, 2008. (2) A. Correia et al. Mycologia 96:598, 2004. (3) J. Luque et al. For. Pathol. 38:147, 2008. (4) J. R. Úrbez-Torres et al. Plant Dis. 94:785, 2010.

Coast live oak, Quercus agrifolia, susceptibility and response to goldspotted oak borer, Agrilus auroguttatus, injury in southern California

2011 ◽  
Vol 261 (11) ◽  
pp. 1852-1865 ◽  
Author(s):  
Tom W. Coleman ◽  
Nancy E. Grulke ◽  
Miles Daly ◽  
Cesar Godinez ◽  
Susan L. Schilling ◽  
...  
Keyword(s):  
Southern California ◽  
Quercus Agrifolia ◽  
Live Oak ◽  
Goldspotted Oak Borer ◽  
Agrilus Auroguttatus
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