Dogwood anthracnose: the story continues

2018 ◽  
pp. 77-82
Author(s):  
R.N. Trigiano ◽  
D. Hadziabdic ◽  
K. Mantooth ◽  
M.T. Windham ◽  
B.H. Ownley ◽  
...  
Keyword(s):  
Dogwood Anthracnose

Effect of acid deposition on trichome morphology and dogwood anthracnose biology

1992 ◽  
Vol 50 (1) ◽  
pp. 840-841
Author(s):  
Kyle T. Thornham ◽  
R. Jay Stipes ◽  
Randolph L. Grayson
Keyword(s):  
Acid Deposition ◽  
Disease Incidence ◽  
Natural Populations ◽  
Tree Disease ◽  
Flowering Dogwood ◽  
Discula Destructiva ◽  
Disease Induction ◽  
Dogwood Anthracnose ◽  
Trichome Morphology ◽  
Precipitation Events

Dogwood anthracnose, caused by Discula destructiva (1), is another new catastrophic tree disease that has ravaged natural populations of the flowering dogwood (Cornus florida) in the Appalachians over the past 15 years, and the epidemic is prognosticated to continue (2). An estimated 9.5 million acres have been affected, primarily in the Appalachian Mountains, from VA southwards, alone, and an estimated 50% of all dogwoods in PA have been killed. Since acid deposition has been linked experimentally with disease induction, and since the disease incidence and severity are more pronounced at higher elevations where lower pH precipitation events occur, we investigated the effect of acidic foliar sprays on moiphologic changes in the foliar cuticle and trichomes (3), the initial sites of infection and foci of Discula sporulation.

A sporulation medium forDiscula destructiva, the dogwood anthracnose fungus

1993 ◽  
Vol 26 (2) ◽  
pp. 117-121 ◽  
Author(s):  
Susan D. McElreath ◽  
Frank H. Tainter
Keyword(s):  
Sporulation Medium ◽  
Dogwood Anthracnose ◽  
Dogwood Anthracnose Fungus

scholarly journals Real-Time PCR Detection of Dogwood Anthracnose Fungus in Historical Herbarium Specimens from Asia

PLoS ONE ◽  
2016 ◽  
Vol 11 (4) ◽  
pp. e0154030 ◽  
Author(s):  
Stephen Miller ◽  
Hayato Masuya ◽  
Jian Zhang ◽  
Emily Walsh ◽  
Ning Zhang
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Pcr Detection ◽  
Herbarium Specimens ◽  
Dogwood Anthracnose ◽  
Dogwood Anthracnose Fungus

Pretreating dogwood seedlings with simulated acidic precipitation increases dogwood anthracnose symptoms in greenhouse–laboratory trials

1993 ◽  
Vol 23 (1) ◽  
pp. 55-58 ◽  
Author(s):  
Robert L. Anderson ◽  
Paul Berrang ◽  
John Knighten ◽  
K. Ann Lawton ◽  
Kerry O. Britton
Keyword(s):  
Disease Severity ◽  
Laboratory Studies ◽  
Acidic Precipitation ◽  
Lime Treatment ◽  
Plastic Bags ◽  
Dogwood Anthracnose ◽  
Simulated Rain ◽  
Temperature Controlled ◽  
One Year ◽  
Leaf Symptoms

One-year-old Cornusflorida L. seedlings were randomly assigned to four treatments of simulated rain (pH 2.5, 3.5, 4.5, and 5.5) in two greenhouse–laboratory studies in 1989 and 1990. After 10 applications over a 42-day period, the seedlings were moved to a temperature-controlled laboratory, placed in plastic bags, humidified, and sprayed with a spore suspension of five Disculadestructiva isolates. About 30 days later, the seedlings were examined for percentage of leaves exhibiting anthracnose symptoms and disease severity on affected leaves. Both trials showed that as the acidity of the simulated rain increased, the incidence and severity of anthracnose leaf symptoms increased. The 1989 study included a soil lime treatment that showed the same trend but the overall occurrence and severity of symptoms was higher.

Influence of canopy microclimate on incidence and severity of dogwood anthracnose

1992 ◽  
Vol 70 (5) ◽  
pp. 1093-1096 ◽  
Author(s):  
Dan O. Chellemi ◽  
Kerry O. Britton
Keyword(s):  
Vapor Pressure ◽  
Air Temperature ◽  
Photosynthetically Active Radiation ◽  
Vapor Pressure Deficit ◽  
Disease Incidence ◽  
Cornus Florida ◽  
Active Radiation ◽  
Dogwood Anthracnose ◽  
Low Levels ◽  
Understory Trees

Incidence and severity of dogwood anthracnose within the interior and exterior canopies of exposed dogwood (Cornus florida L.) trees and canopies of understory trees were recorded over a 53-day period during the summer of 1990. Concurrent measurements of vapor pressure deficit, air temperature, evaporative potential, and photosynthetically active radiation within the canopies were also recorded. Disease incidence was significantly lower in the exterior canopy of exposed trees than in other canopy locations. Disease severity was significantly different among all three canopy locations, with the lowest severity in exterior canopies of exposed trees and the greatest severity in canopies of understory trees. Of the climatic variables measured, evaporative potential provided the most consistent contrast among microclimates at the various canopy locations. Mean evaporative potentials averaged over 6- to 10-day intervals ranged from 0.00 g H2O h−1 in understory and exposed, interior canopies to 0.40 g H2O h−1 in exposed, exterior canopies. Disease incidence and severity were greater in canopies associated with low levels of evaporative potential. Key words: Cornus florida L., dogwood anthracnose, canopy microclimate, evaporative potential.

scholarly journals Comparison of Chitinases from Dogwood Anthracnose Resistant and Susceptible Cornus Species

HortScience ◽  
1998 ◽  
Vol 33 (2) ◽  
pp. 298-301 ◽  
Author(s):  
Nicole A. Cardwell ◽  
Gary L. McDaniel
Keyword(s):  
Chitinase Activity ◽  
Resistance Mechanisms ◽  
Resistant Species ◽  
Cornus Mas ◽  
Pathogenesis Related Protein ◽  
Discula Destructiva ◽  
Pathogenesis Related ◽  
Isoelectric Points ◽  
Molecular Masses ◽  
Dogwood Anthracnose

The pathogenesis-related protein, chitinase, is implicated in the resistance mechanisms involved in dogwood anthracnose, which is caused by Discula destructiva. Chitinase isozymes were isolated from Discula-inoculated Cornus mas, a highly resistant species, and from inoculated C. florida, a highly susceptible species. Chitinase activity was identified in C. mas on days 2-12 following inoculation, but was expressed only on day 8 following inoculation in C. florida. Both dogwood species expressed a constitutive chitinase level in noninoculated control leaves, but Discula-inoculated leaves of C. mas contained three chitinase isozymes, whereas C. florida leaves expressed only two. Molecular masses of isozymes were 21, 32, and 35 kDa for C. mas and 21 and 35 kDa for C. florida. Isoelectric focusing demonstrated three chitinase isozyme isoelectric points for C. mas (pI = 5.6, 6.8, and 8.9), but only two for C. florida (pI = 5.6 and 6.8). These differences in synthesized isozymes and rate of accumulation suggest that chitinase may have a role in the defense of dogwood against D. destructiva infection.

scholarly journals Remote Sensing Techniques Coupled with Leaf Spectroscopy to Evaluate the Severity of Dogwood Anthracnose

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 827C-827
Author(s):  
Tara H. Hayes ◽  
Caula A. Beyl
Keyword(s):  
Remote Sensing ◽  
Image Analysis ◽  
Disease Severity ◽  
Mathematical Expression ◽  
Cornus Florida ◽  
Leaf Reflectance ◽  
Dogwood Anthracnose ◽  
Remote Sensing Techniques

Flowering dogwoods. (Cornus florida L.) have been attacked by dogwood anthracnose. In vivo leaf reflectance values of infected leaves from Summer 1993, Fall 1993, and Fall 1994 were obtained using a spectroreflectometer at wavelengths from 300 to 2500 nm to determine what wavelengths could best detect differences between dead and healthy leaves. At -those wavelengths, a mathematical expression was devised and used to calculate the predicted reflectance value for that percent disease severity (Rexp50%). The predicted reflectance values were compared with actual mean reflectance values (Rmean) obtained from leaves with up to 50% disease severity achieving correlations of 0.95, 0.66, and 0.84, for the Summer and Fall 1993, and Fall 1994, respectively. For Fall 1994, actual disease severity values were obtained by scanning and image analysis to compute an expected reflectance for these actual percentages (Rreal%) for a correlation value of 0.98.

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