Seasonal Factors Affecting the Control of Annual Bluegrass (Poa annua L.) with Xanthomonas campestris pv. poae (JT-P482)

1999 ◽  
Vol 16 (1) ◽  
pp. 18-26 ◽  
Author(s):  
S Imaizumi ◽  
A Tateno ◽  
D Miyamoto ◽  
K Morita ◽  
T Fujimori
Keyword(s):  
Xanthomonas Campestris ◽  
Poa Annua ◽  
Factors Affecting ◽  
Annual Bluegrass ◽  
Seasonal Factors

scholarly journals Biological Control of Annual Bluegrass with Xanthomonas campestris pv. poannua in Bermudagrass

HortScience ◽  
1994 ◽  
Vol 29 (6) ◽  
pp. 659-662 ◽  
Author(s):  
B. Jack Johnson
Keyword(s):  
Biological Control ◽  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Xanthomonas Campestris ◽  
Field Experiments ◽  
Biological Control Agent ◽  
Control Agent ◽  
Poa Annua ◽  
Annual Bluegrass ◽  
Cynodon Transvaalensis

Xanthomonas campestris pv. poannua has potential as a biological control agent for perennial ryegrass (Lolium perenne L.), and it is being evaluated as a commercial bioherbicide. Field experiments were conducted on dormant `Tifway' bermudagrass [Cynodon transvaalensis Burtt-Davy × C. dactylon (L.) Pers.] and `Tifway' bermudagrass overseeded with perennial ryegrass to determine the effects of two isolates of X. campestris pv. poannua on annual bluegrass (Poa annua L.) control. Annual bluegrass control was 82% on 27 Apr. 1992 after isolate MB 218 was applied to dormant bermudagrass at 109 cfu/ml in three applications on 11 and 28 Feb. and 12 Mar. When isolate MB 245 was applied at the same rate and dates, it controlled only 60% of the annual bluegrass. The response from isolate MB 245 at the same rate and number of applications on 28 Apr. 1993 was similar to that in Apr. 1992, with 64% control on dormant turf and 52% control on overseeded turf. There was no significant advantage in annual bluegrass control when isolate MB 245 was applied at 109 cfu/ml in more than three applications during the fall and winter, compared to three applications on 15 Feb. and 1 and 11 Mar. when ratings were made on 28 Apr. 1993. The control of annual bluegrass in late Apr. 1992 and 1993 from X. campestris applied in three applications (11 and 28 Feb. and 12 Mar. 1992 and 15 Feb. and 1 and 11 Mar. 1993) at 109 cfu/ml was greater than when l08 cfu/ml was applied on the same dates.

Factors Affecting Poa annua L. Control

Weeds ◽  
1967 ◽  
Vol 15 (2) ◽  
pp. 98 ◽  
Author(s):  
Felix V. Juska ◽  
A. A. Hanson
Keyword(s):  
Poa Annua ◽  
Factors Affecting

Annual Bluegrass (Poa annua L.)

1998 ◽  
Vol 12 (2) ◽  
pp. 414-416 ◽  
Author(s):  
Larry W. Mitich
Keyword(s):  
Poa Annua ◽  
Annual Bluegrass ◽  
The Family ◽  
The World

The grasses or Poaceae (Gramineae) comprise some 9,000 species grouped into about 650 taxa. Although not the largest, the family is ecologically the most dominant and economically the most important in the world (Heywood 1993).

Control ofPoa annuaby Suppression of Seedheads with Growth Regulators

Weed Science ◽  
1979 ◽  
Vol 27 (2) ◽  
pp. 224-231 ◽  
Author(s):  
T. L. Watschke ◽  
F. W. Long ◽  
J. M. Duich
Keyword(s):  
Dicarboxylic Acid ◽  
Growth Regulators ◽  
Poa Annua ◽  
Pollen Quality ◽  
Annual Bluegrass ◽  
Fertile Pollen ◽  
Materials Used ◽  
Number Of Seeds

Field and greenhouse studies were conducted to determine the degree to which annual bluegrass (Poa annuaL.) could be controlled by inhibiting seedheads. The materials used were: MH (1,2-dihydro-3,6-pyridazinedione); chlorflurenol (methyl 2-chloro-9-hydroxyfluorene-9-carboxylate), plus methyl 9-hydroxyfluorene-9-carboxylate, and methyl 2,7-dichloro-9-hydroxyfluorene-9-carboxylate; and endothall [7-oxabicyclo (2.2.1) heptane-2,3-dicarboxylic acid]. The effects of these materials on pollen quality and the viability of seed produced by treated plants were also determined. For all chemicals used, multiple applications at low rates resulted in better seedhead inhibition than single treatments at higher rates and their effects lasted longer. However, treatments that inhibited seedheads by an amount predicted to reduce annual bluegrass (more than 75%) often caused objectionable foliar discoloration. Endothall, particularly the granular formulation, caused excessive injury at all rates. All growth regulators reduced the number of seed produced, which affected the number of seeds that germinated from soil that was taken from treated plots. The number of seed found in the soil was sufficient to allow the stand to be self-perpetuating. All treatments reduced the percentage of fertile pollen, however, this reduction was not significant because the germination of seed harvested from treated plants was not reduced significantly. Even though these treatments reduced seedheads significantly, the population of annual bluegrass the following year was not reduced.

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