A Test for Constitutive and Induced Resistance by Tall Fescue (Festuca arundinacea) to an Insect Herbivore: Impact of the Fungal Endophyte, Acremonium coenophialum

1996 ◽  
Vol 136 (2) ◽  
pp. 328 ◽  
Author(s):  
Rebecca A. Boning ◽  
Thomas L. Bultman
Keyword(s):  
Induced Resistance ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Fungal Endophyte ◽  
Insect Herbivore ◽  
Acremonium Coenophialum ◽  
Herbivore Impact

Herbicides for Killing Tall Fescue (Festuca arundinacea) Infected With Fescue Endophyte (Acremonium coenophialum)

1989 ◽  
Vol 3 (3) ◽  
pp. 485-489 ◽  
Author(s):  
Albert E. Smith
Keyword(s):  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Field Studies ◽  
Acremonium Coenophialum ◽  
Pasture Grass ◽  
Seed Field

The importance of tall fescue as a pasture grass is diminished when infected with the fescue endophyte. The availability of fungus-free seed has necessitated the development of systems to kill the infected sod before interseeding fungus-free seed. Field studies were conducted to evaluate the response of fescue sod to foliar-applied herbicides as single and sequential applications during the fall and spring. Sequential applications of paraquat at 0.14, 0.28, and 0.56 kg ai/ha in September and October and glyphosate at 0.84 and 1.7 kg/ha applied as single or sequential applications in September and October resulted in more than 90% kill of the tall fescue sod. Spring treatments of paraquat and glyphosate were less effective than those applied in the fall. Dalapon, fluazifop-P, HOE-39866 [glufosinate (proposed name)], sethoxydim, and simazine did not effectively kill the sod.

Response of Pratylenchus spp. in tall fescue infected with different strains of the fungal endophyte Neotyphodium coenophialum

Nematology ◽  
2005 ◽  
Vol 7 (1) ◽  
pp. 105-110 ◽  
Author(s):  
Patricia Timper ◽  
Roger N. Gates ◽  
Joe H. Bouton
Keyword(s):  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Ergot Alkaloids ◽  
Nematode Resistance ◽  
Fungal Endophyte ◽  
Parasitic Nematodes ◽  
Small Subset ◽  
Neotyphodium Coenophialum ◽  
Different Strains ◽  
Endemic Strain

Abstract The presence of the fungal endophyte Neotyphodium coenophialum in tall fescue (Festuca arundinacea) confers resistance to some plant-parasitic nematodes but also results in the production of ergot alkaloids. Recently, new strains of N. coenophialum have been isolated from wild tall fescue and artificially inoculated into elite tall fescue cultivars. These strains produce low to nil levels of ergot alkaloids and are referred to as non-ergot strains. Our objective was to determine whether non-ergot strains of the endophyte confer the same level of resistance to Pratylenchus spp. as the endemic strain in tall fescue. In a glasshouse experiment, nematode resistance was compared in two fescue cultivars (Jesup and Georgia 5) infected with either the endemic strain (E+), or two non-ergot strains, AR542 and AR584. An additional non-ergot strain, AR514, was tested only in cv. Jesup. Cultivars Georgia 5 and Jesup without endophytes (E−) were used as controls. The endophtye status of the plants was confirmed and then three plants per cultivar/endophyte combination were transplanted into 10 cm square pots. The pots were inoculated with a mixed culture of Pratylenchus zeae and P. scribneri in the first trial and a pure culture of P. scribneri in the second trial of the experiment. After 8 weeks, the number of nematodes within the roots from each pot was determined. Numbers of Pratylenchus spp. in either cv. Georgia 5 or cv. Jesup containing the non-ergot strain AR542 were not different from numbers in E− plants. AR514 also did not confer resistance to the nematodes in cv. Jesup. By contrast, the non-ergot strain AR584 appears to confer resistance to Pratylenchus spp. in cv. Georgia 5, but not in cv. Jesup; however, the level of resistance in cv. Georgia 5 was less than the resistance conferred by the endemic endophyte. Genetic differences between the two tall fescue cultivars may affect growth of the endophyte or production of a nematode toxin or deterrent by the endophyte. As only a small subset of endophyte strains has been tested, we are screening additional non-ergot strains for resistance to P. scribneri.

Preferences of Japanese Beetle and Southern Masked Chafer (Coleoptera: Scarabaeidae) Grubs Among Cool-Season Turfgrasses

1994 ◽  
Vol 29 (3) ◽  
pp. 398-406 ◽  
Author(s):  
Berry A. Crutchfield ◽  
Daniel A. Potter
Keyword(s):  
Tall Fescue ◽  
Festuca Arundinacea ◽  
The Other ◽  
Popillia Japonica ◽  
Feeding Preferences ◽  
Japanese Beetle ◽  
Acremonium Coenophialum ◽  
Cool Season ◽  
Lolium Perenne L ◽  
Choice Tests

Feeding preferences of Japanese beetle, Popillia japonica Newman, and southern masked chafer, Cyclocephala lurida Bland, grubs for six common cool-season turfgrasses were evaluated in choice tests in the greenhouse. On the basis of larval distributions, Popillia japonica consistently preferred perennial ryegrass, Lolium perenne L., over all other turfgrasses tested. In contrast, C. lurida showed no consistent pattern of preference. Presence of one grub species did not affect distribution of the other species. Grubs did not discriminate between tall fescue, Festuca arundinacea Schreb., infected with the endophyte Acremonium coenophialum Morgan-Jones & Gams and endophyte-free tall fescue.

scholarly journals Effects of Environmental Heat and Intake of Tall Fescue Seed Infested with Acremonium Coenophialum on the Acid-Base Status of Young Bulls

1996 ◽  
Vol 8 (2) ◽  
pp. 233-237 ◽  
Author(s):  
L. L. Mills Wallace ◽  
D. W. Vogt ◽  
R. J. Lipsey ◽  
G. B. Gamer ◽  
C. N. Cornell
Keyword(s):  
Heat Stress ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Environmental Temperature ◽  
Respiratory Alkalosis ◽  
Acremonium Coenophialum ◽  
Acid Base ◽  
Arterial Blood ◽  
Metabolic Compensation ◽  
Acid Base Status

Effects of high environmental temperature and dietary intake of tall fescue ( Festuca arundinacea) seed containing the endophyte Acremonium coenophialum on bovine acid-base status were studied using 3 groups of bull calves (2 Simmental, 1 Angus). Experimental animals were housed in controlled-climate chambers and subjected to gradual increases in environmental temperature, first while being fed an endophyte-free diet and then while being fed a diet containing 17% endophyte-infested fescue seed. Marked acid-base disturbances were not observed in any animals. In general, Pco2, HCO3-, base excess, and arterial blood pH values were reduced in response to heat stress, both with endophyte-free and endophyte-containing diets. In most individuals anion gap increased. These results reflected metabolic compensation for mild chronic alveolar hyperventilation and retention of organic acids. These findings suggest that, under conditions similar to those found during the summer in central Missouri, normal cattle should not be at great risk of developing respiratory alkalosis or other severe acid-base disturbances as a result of heat stress and/or intake of tall fescue endophyte.

Steer Performance and Association of Acremonium coenophialum Fungal Endophyte on Tall Fescue Pasture 1

1983 ◽  
Vol 75 (5) ◽  
pp. 821-824 ◽  
Author(s):  
C. S. Hoveland ◽  
S. P. Schmidt ◽  
C. C. King ◽  
J. W. Odom ◽  
E. M. Clark ◽  
...  
Keyword(s):  
Tall Fescue ◽  
Fungal Endophyte ◽  
Acremonium Coenophialum

Performance of growing lambs fed Acremonium coenophialum infested tall fescue (Festuca arundinacea Schreb.) hay

1992 ◽  
Vol 7 (1) ◽  
pp. 9-19 ◽  
Author(s):  
A.B. Chestnut ◽  
J.K. Bernard ◽  
J.B. Harstin ◽  
B.B. Reddick
Keyword(s):  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Acremonium Coenophialum
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