Abstract
Abstract The rice stink bug, O ebalus pugnax ( F abricius) ( H emiptera: P entatomidae: C arpocorini), though graminaceous, discriminates among its numerous host grass species. This could represent a feeding preference, it could be related to host suitability for growth and development. To clarify the role of host grass discrimination, two laboratory studies were conducted: (1) free‐choice tests to evaluate preferences of O . pugnax among 11 wild host grass species found in three rice‐producing counties of the central Mississippi Delta ( MS , USA ), and (2) no‐choice tests to evaluate the impact of rice ( O ryza sativa L .), junglerice [ E chinochloa colona ( L .) Link], and dallisgrass ( P aspalum dilatatum P oir.) (all P oaceae), on the development of O . pugnax from second instar to adult. In the free‐choice test, four experiments were conducted, each with four sets of host grass species and observed 1, 2, 4, 8, and 16 h after release in cages. Approximately 4 h was necessary for O . pugnax to settle on preferred host grasses. O ebalus pugnax showed a feeding preference for junglerice over all 10 other grass species. B ahiagrass, P aspalum notatum F lueggé, was the least preferred. The no‐choice tests showed significant effect of host grass species on O . pugnax mean development time of nymphal survival to adults. Survival of nymphs was lower and mean development time was longer on dallisgrass compared to rice and junglerice. Knowledge of O . pugnax rate of growth and development on host grasses could be useful in the future development of rice integrated pest management strategies.
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Claims 6
Claim · model-written summary
Rice stink bugs needed approximately four hours to settle on preferred grasses.
- Taxon
- grassest0
- Interactor
- Oebalus pugnax
.jpg?width=60)
Oebalus pugnaxt0pest - Outcome
- settle on preferred host grassese0
- Value
- 4 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Approximately 4 h was necessary for O . pugnax to settle on preferred host grasses”
t0“grasses for Oebalus pugnax”
Claim · model-written summary
Oebalus pugnax preferred junglerice to all ten other grasses.
- Taxon
- junglerice
Echinochloa colonae0 - Interactor
- O ebalus pugnaxe0pest
- Outcome
- feeding preference for junglericee0
- Direction
- preferencee0
- Comparator
- all 10 other grass speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O ebalus pugnax showed a feeding preference for junglerice over all 10 other grass species”
Claim · model-written summary
Bahiagrass was the least preferred host.
- Taxon
- B ahiagrasse0
- Interactor
- Oebalus pugnaxOebalus pugnaxt0pest
- Outcome
- least preferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B ahiagrass, P aspalum notatum F lueggé, was the least preferred”
t0“Oebalus pugnax”
Claim · model-written summary
Host grass species significantly affected bug development time.
- Taxon
- host grass speciese0
- Interactor
- O . pugnaxOebalus pugnaxe0pest
- Outcome
- O . pugnax mean development timee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The no‐choice tests showed significant effect of host grass species on O . pugnax mean development time of nymphal survival to adults”
Claim · model-written summary
Bug nymph survival was lower on dallisgrass than rice and junglerice.
- Taxon
- dallisgrass
_Paspalum_dilatatum_inflorescences.jpg?width=60)
Paspalum dilatatume0 - Interactor
- Oebalus pugnaxOebalus pugnaxt0pest
- Outcome
- Survival of nymphse0
- Direction
- lowere0
- Comparator
- rice and junglericee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Paspalum_dilatatum_inflorescences.jpg?width=500)
Verbatim
e0“Survival of nymphs was lower and mean development time was longer on dallisgrass compared to rice and junglerice”
t0“Oebalus pugnax”
Claim · model-written summary
Bug development time was longer on dallisgrass than rice and junglerice.
- Taxon
- dallisgrassPaspalum dilatatume0
- Interactor
- Oebalus pugnaxOebalus pugnaxt0pest
- Outcome
- mean development timee0
- Direction
- longere0
- Comparator
- rice and junglericee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Survival of nymphs was lower and mean development time was longer on dallisgrass compared to rice and junglerice”
t0“Oebalus pugnax”