Abstract
Two-striped leaf beetle (TSLB) larvae are known to damage soybean root nodules but the effect they have on yield has not been quantitatively assessed. This study was aimed to evaluate the impact of TSLB and to establish a technique to control the larvae. We surveyed 106 farmers’ fields in Aichi prefecture for two years to quantify the changes in TSLB adult population, nodule damage by larvae, and nitrogen (N) content of seeds and stems, growth and yields of soybean plants treated with two different pesticides that were applied to furrow at the time of seeding. The results showed that damage caused by TSLB larval feeding of root nodules was observed particularly in soybeans grown in N-poor soil, and that ureide N content was decreased in plants with damage caused by larval feeding of root nodule, and such damage caused reduction of yield consistently in both years. Furthermore, we also showed the effectiveness of applying insecticides to the sowing furrow at the time of seeding. Specifically, the application of disulfoton to the sowing furrow at a rate of 4 g m–2 as a simple method of pest control limited insect occurrences until the beginning of the blooming stage, curbed the feeding damage to root nodules caused by larvae, and increased the yield of soybean by 20%. This method has been adopted widely in Japan because it can be readily implemented using the fertilization application equipment installed on seeding machines and the insecticide is relatively inexpensive.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Beetle nodule damage was especially observed in soybeans on nitrogen-poor soil.
- Taxon
- soybeans
Glycine maxe0 - Interactor
- TSLBe0pest
- Outcome
- damage caused by TSLB larval feeding of root nodulese0
- Setting
- N-poor soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“damage caused by TSLB larval feeding of root nodules was observed particularly in soybeans grown in N-poor soil”
Claim · model-written summary
Damaged soybean plants had decreased ureide nitrogen content.
- Taxon
- soybeanGlycine maxt0
- Interactor
- Two-Striped Leaf Beetlet0pest
- Outcome
- ureide N contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ureide N content was decreased in plants with damage caused by larval feeding of root nodule”
t0“Two-Striped Leaf Beetle (Medythia nigrobilineata Motschulsky) Larval Feeding of Root Nodules in Soybean”
Claim · model-written summary
Beetle feeding damage reduced soybean yield in both years.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- Two-Striped Leaf Beetlet0pest
- Outcome
- yielde0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“such damage caused reduction of yield consistently in both years”
t0“Two-Striped Leaf Beetle (Medythia nigrobilineata Motschulsky) Larval Feeding of Root Nodules in Soybean”
Claim · model-written summary
Furrow disulfoton limited insect occurrence until blooming.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- disulfoton to the sowing furrow at a rate of 4 g m–2e0
- Interactor
- Two-Striped Leaf Beetlet0pest
- Outcome
- insect occurrencese0
- Direction
- limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of disulfoton to the sowing furrow at a rate of 4 g m–2 as a simple method of pest control limited insect occurrences until the beginning of the blooming stage”
t0“Two-Striped Leaf Beetle (Medythia nigrobilineata Motschulsky) Larval Feeding of Root Nodules in Soybean”
Claim · model-written summary
Furrow disulfoton curbed larval feeding damage to root nodules.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- disulfotone1
- Interactor
- Two-Striped Leaf Beetlet0pest
- Outcome
- feeding damage to root nodules caused by larvaee0
- Direction
- curbede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“curbed the feeding damage to root nodules caused by larvae”
t0“Two-Striped Leaf Beetle (Medythia nigrobilineata Motschulsky) Larval Feeding of Root Nodules in Soybean”
e1“application of disulfoton to the sowing furrow at a rate of 4 g m–2”
Claim · model-written summary
Furrow disulfoton increased soybean yield by 20%.
- Taxon
- soybeanGlycine maxe0
- Treatment
- disulfotone1
- Interactor
- Two-Striped Leaf Beetlet0pest
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the yield of soybean by 20%”
t0“Two-Striped Leaf Beetle (Medythia nigrobilineata Motschulsky) Larval Feeding of Root Nodules in Soybean”
e1“application of disulfoton to the sowing furrow at a rate of 4 g m–2”
The same questions in other papers
disulfoton · yield · Glycine max (soybean)Positive and negative results
1 in the opposite direction
- no effect
disulfoton · pest · Glycine max (soybean)Positive and negative results
1 in the opposite direction
- no effect
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.