Abstract
Rice blast (Pyricularia oryzae Cavara) is one of the most devastating diseases affecting the rice crop in Cambodia and other countries in the world. The fungus Trichoderma spp. is known as one of biological control agents applied as a soil treatment, seed treatment and foliar application, that is used for suppression of various diseases caused by fungal pathogens. Trichoderma harzianum strain BTB 022 is one of the commercial biological control products available in Cambodian markets. The combined use of T. harzianum and a resistant variety, to manage blast disease, are considered as sustainable approaches to reduce yield losses and to cope with recent restrictions on fungicide use. A series of consecutive experiments was conducted to examine the effectiveness of T. harzianum on suppression of rice blast incidence in Koktrap and Polors agricultural research stations during wet and dry seasons in 2016 and 2017. In both years, the treatments consisted of the use of Trichoderma on susceptible and resistant rice varieties. In 2017 the two treatments were combined with conventional practice treatments representing the average farmers' practice. The experiments were arranged in randomized complete block design with three replications in 2016 and four replications in 2017. Leaf blast incidence was assessed at five and four growth stages in 2016 and 2017, respectively, and the area under the leaf blast progress curve (AULBPC) was computed for each year and location. Neck blast (NB) incidence was assessed at dough stage and grain yield (GY) was measured at ripening stage. T. harzianum reduced the incidence of leaf blast and neck blast on IR504 (susceptible strain), but its efficacy was not consistent. The magnitude of disease suppression by T. harzianum was higher for neck blast than for leaf blast. GY variation was correlated with AULBPC and NB incidence, which suggests that disease reduction corresponded to an increase in yield (AULBPC: r = −0.877, P < 0.001; NB incidence: r = −0.567, P < 0.001). T. harzianum effectively reduced neck blast at high disease pressure. Growing a resistant variety, e.g. CAR14, effectively reduced AULBPC and NB incidence compared to T. harzianum and farmers’ practice of fungicidal use but the association of T. harzianum and resistant variety did not increase the effect in the control of disease.
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Claims 9
Claim · model-written summary
T. harzianum reduced leaf blast incidence on susceptible IR504, with inconsistent efficacy.
- Taxon
- rice
Oryza sativat0 - Material
- IR504e0
- Treatment
- T. harzianume0
- Interactor
- leaf blaste0pathogen
- Second interactor
- T. harzianum
Trichoderma harzianume0biocontrol_agent - Outcome
- incidence of leaf blaste0
- Direction
- reducede0
- Qualifier
- its efficacy was not consistente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T. harzianum reduced the incidence of leaf blast and neck blast on IR504 (susceptible strain), but its efficacy was not consistent”
t0“rice”
Claim · model-written summary
T. harzianum reduced neck blast incidence on susceptible IR504, with inconsistent efficacy.
- Taxon
- riceOryza sativat0
- Material
- IR504e0
- Treatment
- T. harzianume0
- Interactor
- neck blaste0pathogen
- Second interactor
- T. harzianumTrichoderma harzianume0biocontrol_agent
- Outcome
- neck blaste0
- Direction
- reducede0
- Qualifier
- its efficacy was not consistente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T. harzianum reduced the incidence of leaf blast and neck blast on IR504 (susceptible strain), but its efficacy was not consistent”
t0“rice”
Claim · model-written summary
T. harzianum suppressed neck blast more than leaf blast.
- Taxon
- riceOryza sativat0
- Treatment
- T. harzianume0
- Interactor
- neck blaste0pathogen
- Second interactor
- T. harzianumTrichoderma harzianume0biocontrol_agent
- Outcome
- disease suppressione0
- Direction
- highere0
- Comparator
- leaf blaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The magnitude of disease suppression by T. harzianum was higher for neck blast than for leaf blast”
t0“rice”
Claim · model-written summary
Grain yield variation was negatively correlated with AULBPC.
- Taxon
- riceOryza sativat0
- Interactor
- AULBPCe0pathogen
- Outcome
- GY variatione0
- Direction
- increaseinferrede0
- Value
- r = −0.877, P < 0.001e0
- Comparator
- AULBPCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GY variation was correlated with AULBPC and NB incidence, which suggests that disease reduction corresponded to an increase in yield (AULBPC: r = −0.877, P < 0.001; NB incidence: r = −0.567, P < 0.001)”
t0“rice”
Claim · model-written summary
Grain yield variation was negatively correlated with neck blast incidence.
- Taxon
- riceOryza sativat0
- Interactor
- NB incidencee0pathogen
- Outcome
- GY variatione0
- Direction
- increaseinferrede0
- Value
- r = −0.567, P < 0.001e0
- Comparator
- NB incidencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GY variation was correlated with AULBPC and NB incidence, which suggests that disease reduction corresponded to an increase in yield (AULBPC: r = −0.877, P < 0.001; NB incidence: r = −0.567, P < 0.001)”
t0“rice”
Claim · model-written summary
T. harzianum reduced neck blast under high disease pressure.
- Taxon
- riceOryza sativat0
- Treatment
- T. harzianume0
- Interactor
- neck blaste0pathogen
- Second interactor
- T. harzianumTrichoderma harzianume0biocontrol_agent
- Outcome
- neck blaste0
- Direction
- reducede0
- Qualifier
- high disease pressuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T. harzianum effectively reduced neck blast at high disease pressure”
t0“rice”
Claim · model-written summary
The resistant variety CAR14 reduced AULBPC relative to Trichoderma and farmers’ fungicide practice.
- Taxon
- riceOryza sativat0
- Material
- CAR14e0
- Treatment
- Growing a resistant varietye0
- Interactor
- T. harzianumTrichoderma harzianume0biocontrol_agent
- Outcome
- AULBPCe0
- Direction
- reducede0
- Comparator
- T. harzianum and farmers’ practice of fungicidal usee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growing a resistant variety, e.g. CAR14, effectively reduced AULBPC and NB incidence compared to T. harzianum and farmers’ practice of fungicidal use”
t0“rice”
Claim · model-written summary
The resistant variety CAR14 reduced neck blast incidence relative to Trichoderma and farmers’ fungicide practice.
- Taxon
- riceOryza sativat0
- Material
- CAR14e0
- Treatment
- Growing a resistant varietye0
- Interactor
- T. harzianumTrichoderma harzianume0biocontrol_agent
- Outcome
- NB incidencee0
- Direction
- reducede0
- Comparator
- T. harzianum and farmers’ practice of fungicidal usee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growing a resistant variety, e.g. CAR14, effectively reduced AULBPC and NB incidence compared to T. harzianum and farmers’ practice of fungicidal use”
t0“rice”
Claim · model-written summary
Combining T. harzianum with a resistant variety did not improve disease control.
- Taxon
- riceOryza sativat0
- Treatment
- T. harzianum and resistant varietye0
- Interactor
- T. harzianumTrichoderma harzianume0biocontrol_agent
- Outcome
- effect in the control of diseasee0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the association of T. harzianum and resistant variety did not increase the effect in the control of disease”
t0“rice”
The same questions in other papers
Trichoderma harzianum · control · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
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Trichoderma harzianum · disease · Oryza sativa (rice)Results agree
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- positive
- positive
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12 papers more in this group
See all 16 papers →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.