Abstract
Seed-applied insecticides are the standard control method used in the United States to minimize rice water weevil (Lissorhoptrus oryzophilus Kuschel) injury to rice (Oryza sativa L.) roots, and often results in greater yields than rice that receives no seed-applied insecticide. Yield increases from seed-applied insecticides often occur even when insect pressure is low and should not cause yield loss. The research objective was to evaluate the effect of urea-nitrogen rate and seed-applied insecticide on number of rice water weevil larvae, nitrogen uptake, and rice grain yield. Six trials were conducted at the Pine Tree Research Station (PTRS) and the Rice Research Extension Center (RREC) to examine the response of rice plants receiving different insecticide-seed treatments and urea-nitrogen rate combinations. Insecticide-seed treatments included label rates of clothianidin, thiamethoxam, and a no-insecticide (fungicide only) control, in combination with season-total nitrogen rates of 0, 50, 100, 150, and 200 kg urea-nitrogen/ha. Rice seed that was treated with clothianidin or thiamethoxam generally had equal numbers of rice water weevil larvae, which were significantly fewer compared with rice that received no insecticide with an equivalent urea-nitrogen rate. Nitrogen uptake at panicle differentiation was not affected by insecticide-seed treatments at four of six sites and usually increased positively and linearly as urea-nitrogen rate increased. As urea-nitrogen rate increased, grain yield increased either linearly or nonlinearly. Averaged across urea-nitrogen rates, both insecticide seed treatments had similar yields that were 4 to 7% greater than the grain yields of rice that received no insecticide at four of the five harvested sites.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
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 8
Claim · model-written summary
Clothianidin and thiamethoxam had similar larval counts.
- Taxon
- Rice
Oryza sativae0 - Treatment
- clothianidin or thiamethoxame0
- Interactor
- rice water weevil
Lissorhoptrus oryzophiluse0pest - Outcome
- rice water weevil larvaee0
- Direction
- equale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice seed that was treated with clothianidin or thiamethoxam generally had equal numbers of rice water weevil larvae”
Claim · model-written summary
Clothianidin reduced rice water weevil larvae relative to no insecticide at equal nitrogen rate.
- Taxon
- RiceOryza sativae0
- Treatment
- clothianidine0
- Interactor
- rice water weevilLissorhoptrus oryzophiluse0pest
- Outcome
- rice water weevil larvaee0
- Direction
- fewere0
- Comparator
- no insecticidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice seed that was treated with clothianidin or thiamethoxam generally had equal numbers of rice water weevil larvae, which were significantly fewer compared with rice that received no insecticide with an equivalent urea-nitrogen rate”
Claim · model-written summary
Thiamethoxam reduced rice water weevil larvae relative to no insecticide at equal nitrogen rate.
- Taxon
- RiceOryza sativae0
- Treatment
- thiamethoxame0
- Interactor
- rice water weevilLissorhoptrus oryzophiluse0pest
- Outcome
- rice water weevil larvaee0
- Direction
- fewere0
- Comparator
- no insecticidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice seed that was treated with clothianidin or thiamethoxam generally had equal numbers of rice water weevil larvae, which were significantly fewer compared with rice that received no insecticide with an equivalent urea-nitrogen rate”
Claim · model-written summary
Insecticide treatments did not affect nitrogen uptake at four of six sites.
- Taxon
- riceOryza sativae1
- Organ / stage
- panicle differentiatione0
- Treatment
- insecticide-seed treatmentse0
- Outcome
- Nitrogen uptakee0
- Direction
- not affectede0
- Value
- four of six sitese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake at panicle differentiation was not affected by insecticide-seed treatments at four of six sites”
e1“rice plants”
Claim · model-written summary
Nitrogen uptake usually rose linearly with urea-nitrogen rate.
- Taxon
- riceOryza sativae1
- Organ / stage
- panicle differentiatione0
- Treatment
- urea-nitrogen ratee0
- Outcome
- Nitrogen uptakee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake at panicle differentiation was not affected by insecticide-seed treatments at four of six sites and usually increased positively and linearly as urea-nitrogen rate increased”
e1“rice plants”
Claim · model-written summary
Grain yield increased linearly or nonlinearly with urea-nitrogen rate.
- Taxon
- riceOryza sativae1
- Treatment
- urea-nitrogen ratee0
- Outcome
- grain yielde0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As urea-nitrogen rate increased, grain yield increased either linearly or nonlinearly”
e1“rice plants”
Claim · model-written summary
Clothianidin increased mean yield 4 to 7% versus no insecticide at four of five harvested sites.
- Taxon
- riceOryza sativae0
- Treatment
- clothianidine1
- Outcome
- yieldse0
- Direction
- greatere0
- Value
- 4 to 7%e0
- Qualifier
- four of the five harvested sitese0
- Comparator
- no insecticidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both insecticide seed treatments had similar yields that were 4 to 7% greater than the grain yields of rice that received no insecticide at four of the five harvested sites”
e1“clothianidin, thiamethoxam”
Claim · model-written summary
Thiamethoxam increased mean yield 4 to 7% versus no insecticide at four of five harvested sites.
- Taxon
- riceOryza sativae0
- Treatment
- thiamethoxame1
- Outcome
- yieldse0
- Direction
- greatere0
- Value
- 4 to 7%e0
- Qualifier
- four of the five harvested sitese0
- Comparator
- no insecticidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both insecticide seed treatments had similar yields that were 4 to 7% greater than the grain yields of rice that received no insecticide at four of the five harvested sites”
e1“clothianidin, thiamethoxam”
The same questions in other papers
thiamethoxam · yield · Oryza sativa (rice)Results differ
7 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
7 papers more in this group
See all 11 papers →clothianidin · yield · Oryza sativa (rice)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →clothianidin · Lissorhoptrus oryzophilus · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
thiamethoxam · Lissorhoptrus oryzophilus · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- positive
- positive
insecticide · nutrient: content · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.