Abstract
The efficacy of newly implemented fungicide recommendations on reducing the intensity of ray blight disease caused by Phoma ligulicola to achieve site-specific attainable yield potentials in Tasmanian pyrethrum fields was quantified over two seasons in 46 and 51 fields during the 2003 and 2004 growing seasons, respectively. Disease intensity and yield in two plots (10 × 24 m), one following the commercial fungicide protocol recommendations and the second receiving no fungicide, were assessed in each pyrethrum field. The commercial fungicide protocol consisted of one application of azoxystrobin at 150 g a.i./ha, followed by two applications of a tank mixture of difenoconazole at 125 g a.i./ha and chlorothalonil at 1,008 liters a.i./ha at 14- to 21-day intervals. This program resulted in significant decreases in defoliation severity and the incidence of stems and flowers with ray blight, and increases in the height of stems and number of flowers produced per stem in October and November. In plots receiving the commercial fungicide protocol, the dry weight of flowers was increased by 76 and 68% in 2003 and 2004, respectively. Moreover, pyrethrin yield increased by 81 and 78% when the commercial fungicide protocol was used compared with the nontreated plots. Tobit regression was used to examine the relationships and thresholds among disease intensity measures (defoliation severity, stem severity, and incidence of flowers with ray blight) assessed just prior to harvest. This regression utilized a left-censored regression model to define subminimal thresholds, as none of the disease intensity measures could be less than 0. Defoliation severity had a threshold of 35.3% before stem severity linearly increased and a threshold of 38.2% before the incidence of flowers with ray blight linearly increased. Finally, the threshold for stem severity was 13.7% before the incidence of flowers with ray blight linearly increased. These thresholds can be used to assist growers in making disease management decisions with the objective of minimizing loss of flowers by maintaining defoliation severity below the critical point at which the incidence of flowers with ray blight begins to linearly increase.
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Claims 9
Claim · model-written summary
The commercial fungicide program significantly decreased defoliation severity and incidence of ray blight in stems and flowers.
- Taxon
- Pyrethrum
Tanacetum cinerariifoliumt0 - Treatment
- This programe0
- Outcome
- defoliation severity and the incidence of stems and flowers with ray blighte0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This program resulted in significant decreases in defoliation severity and the incidence of stems and flowers with ray blight”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
The fungicide program increased stem height and flowers per stem in October and November.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Treatment
- This programe0
- Outcome
- height of stems and number of flowers produced per steme0
- Direction
- increasese0
- Qualifier
- October and Novembere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This program resulted in significant decreases in defoliation severity and the incidence of stems and flowers with ray blight, and increases in the height of stems and number of flowers produced per stem in October and November.”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
The protocol increased flower dry weight by 76% in 2003.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Treatment
- commercial fungicide protocole0
- Outcome
- dry weight of flowerse0
- Direction
- increasede0
- Value
- 76e0
- Qualifier
- 2003e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plots receiving the commercial fungicide protocol, the dry weight of flowers was increased by 76 and 68% in 2003 and 2004, respectively.”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
The protocol increased flower dry weight by 68% in 2004.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Treatment
- commercial fungicide protocole0
- Outcome
- dry weight of flowerse0
- Direction
- increasede0
- Value
- 68%e0
- Qualifier
- 2004e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plots receiving the commercial fungicide protocol, the dry weight of flowers was increased by 76 and 68% in 2003 and 2004, respectively.”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
The protocol increased pyrethrin yield by 81% in 2003 relative to untreated plots.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Treatment
- commercial fungicide protocole0
- Outcome
- pyrethrin yielde0
- Direction
- increasede0
- Value
- 81e0
- Comparator
- nontreated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pyrethrin yield increased by 81 and 78% when the commercial fungicide protocol was used compared with the nontreated plots”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
The protocol increased pyrethrin yield by 78% in 2004 relative to untreated plots.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Treatment
- commercial fungicide protocole0
- Outcome
- pyrethrin yielde0
- Direction
- increasede0
- Value
- 78%e0
- Comparator
- nontreated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pyrethrin yield increased by 81 and 78% when the commercial fungicide protocol was used compared with the nontreated plots”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
Stem severity increased linearly after defoliation severity reached 35.3%.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Outcome
- stem severitye0
- Direction
- increasede0
- Value
- 35.3%e0
- Qualifier
- Defoliation severitye0
- Setting
- Tasmaniant0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation severity had a threshold of 35.3% before stem severity linearly increased”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
Flower ray blight incidence increased linearly after defoliation severity reached 38.2%.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Outcome
- incidence of flowers with ray blighte0
- Direction
- increasede0
- Value
- 38.2%e0
- Qualifier
- thresholde0
- Setting
- Tasmaniant0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a threshold of 38.2% before the incidence of flowers with ray blight linearly increased”
t0“Tasmanian Pyrethrum Fields”
Claim · model-written summary
Flower ray blight incidence increased linearly after stem severity reached 13.7%.
- Taxon
- PyrethrumTanacetum cinerariifoliumt0
- Outcome
- incidence of flowers with ray blighte0
- Direction
- increasede0
- Value
- 13.7%e0
- Qualifier
- stem severitye0
- Setting
- Tasmaniant0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the threshold for stem severity was 13.7% before the incidence of flowers with ray blight linearly increased”
t0“Tasmanian Pyrethrum Fields”
The same questions in other papers
fungicide · growth · Tanacetum cinerariifolium (pyrethrum)Results agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.