scholarly journals Comparative Histopathology of Host Reaction Types in Slash Pine Resistant to Cronartium quercuum f. sp. fusiforme

Forests ◽  
2013 ◽  
Vol 4 (2) ◽  
pp. 319-328 ◽  
Author(s):  
Karina Gramacho ◽  
Thomas Miller ◽  
Robert Schmidt
Keyword(s):  
Slash Pine ◽  
Host Reaction ◽  
Cronartium Quercuum

scholarly journals Fusiform Rust Trends in East Texas: 1969-1987

1988 ◽  
Vol 12 (4) ◽  
pp. 259-261 ◽  
Author(s):  
J. David Lenhart ◽  
W. Thomas McGrath ◽  
Terry L. Hackett
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Pinus Elliottii ◽  
Slash Pine ◽  
Pine Plantations ◽  
East Texas ◽  
Infection Rates ◽  
Fusiform Rust ◽  
Cronartium Quercuum ◽  
Pinus Taeda L

Abstract Five surveys of pine plantations in East Texas over an 18-year period (1969-1987) indicated that fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme Birdsall and Snow) infection rates have increased to current levels of about 50% on slash pine (Pinus elliottii Engelm.) and are continuing to increase on loblolly pine (Pinus taeda L.) to 10-15% levels. South. J. Appl. For. 12(4):259-261.

Rainfall and Frequency of Ferbam Sprays Important for Fusiform Rust Control

1979 ◽  
Vol 3 (4) ◽  
pp. 167-168
Author(s):  
S. J. Rowan
Keyword(s):  
Slash Pine ◽  
Fusiform Rust ◽  
Cronartium Quercuum ◽  
Pine Seedlings ◽  
Artificial Rain

Abstract Slash pine seedlings were exposed to 0, 1/4, 1/2, 1, or 2 inches of artificial rain 2, 24, 48, or 96 hours after a ferbam spray was applied at the rate of 200 gallons per acre. All seedlings were artifically inoculated with basidiospores of Cronartium quercuum f. sp. fusiforme two to three hours after the rain. Results indicate that ferbam should be applied every second day after 1/4 to 1/2 inch of rain, every day if more than 1/2 inch of rain occurs within 24 hours after ferbam application, and every third day if there is no rain. Ferbam sprays need not be reapplied on the same day, even after 2 inches of rain, but it is important to respray seedlings the next day.

scholarly journals Influence of Inoculum Concentration on Production of Spermogonia and Aecia on Pine Seedlings Infected by Basidiospores of Cronartium quercuum f. sp. fusiforme

Plant Disease ◽  
1999 ◽  
Vol 83 (4) ◽  
pp. 367-370 ◽  
Author(s):  
R. A. Schmidt ◽  
T. Miller
Keyword(s):  
Loblolly Pine ◽  
Slash Pine ◽  
Mating Types ◽  
Inoculum Concentration ◽  
Host Parasite Interactions ◽  
Cronartium Quercuum ◽  
Pine Seedlings ◽  
Host Parasite ◽  
Heterogeneous Source

Seedlings of slash pine and loblolly pine inoculated with four concentrations of basidiospores of Cronartium quercuum f. sp. fusiforme and exhibiting large galls (≥25 mm long) were observed for spermogonial and aecial sporulation. Basidiospores from a genetically heterogeneous source at 50, 100, 1,000 and 5,000 spores/5-μl droplet were applied to the severed, succulent terminal of 6-week-old seedlings. Incidence of sporulation showing (i) spermatia (pycniospores) only, (ii) aeciospores only, (iii) spermatia and aeciospores, and (iv) absence of sporulation was recorded for 3 years. On slash pine, the percentage of seedlings showing only spermatia varied significantly and inversely with inoculum concentration. In contrast, the percentage of seedlings showing only aeciospores or aeciospores and spermatia varied directly with inoculum concentration. Results on loblolly pine were similar. It is suggested that, at low inoculum concentrations, hyphal anastomoses are limited by fewer haploid mycelia in infected tissues or fewer mating types resulting from incompatible host-parasite interactions.

IV. IMMUNOLOGICAL ASPECTS OF THE HOST REACTION TO ENDOTOXINS

1961 ◽  
Vol 25 (4) ◽  
pp. 457-458 ◽  
Author(s):  
Chandler A. Stetson
Keyword(s):  
Host Reaction
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