Abstract
The Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), is a vector of the bacterium causing Huanglongbing and responsible for substantial productivity loss in the Florida citrus industry. In this study, the effect of different concentrations of nitrogen fertilizer applied to orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings on biological parameters of the Asian citrus psyllid was evaluated. Nitrogen was applied at 0, 7.5, 15 and 30 mg/L which represented 0%, 50%, 100%, and 200% of the recommended levels for seedlings, while holding the doses of micronutrients, potassium, and phosphate constant. Females produced 138% more eggs from the 50% treatment compared to the 200% treatment and there was no difference between the 0%, 50%, and 100% nitrogen treatments. Nymphal development time did not differ among nitrogen doses. Nymphal survival was reduced dramatically at 200% nitrogen treatment. Morphometric analysis revealed that female wings were longest with the 100% nitrogen treatment and shortest with 0%. Shape of wings differed significantly with the 200% nitrogen treatment distinct from all other treatments, and the 50% treatment differed from the 100%. Application of the 200% nitrogen treatment negatively impacted psyllids likely due to the detrimental effect of excess nitrogen on the plants. Chlorophyll content of newly flushed leaves did not differ among treatments before nitrogen treatment, but chlorophyll content in plants receiving 50% nitrogen levels was significantly greater than other treatments at the end of the study.
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 10
Claim · model-written summary
Psyllid females laid 138% more eggs with 50% nitrogen than with 200% nitrogen.
- Taxon
- orangee1
- Treatment
- 50% treatmente0
- Outcome
- Females produced 138% more eggse0
- Direction
- moree0
- Value
- 138%e0
- Comparator
- 200% treatmente0
Not reportedInteractor
Verbatim
e0“Females produced 138% more eggs from the 50% treatment compared to the 200% treatment”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Psyllid egg production did not differ among 0%, 50%, and 100% nitrogen treatments.
Verbatim
e0“there was no difference between the 0%, 50%, and 100% nitrogen treatments”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
e2“Females produced 138% more eggs”
Claim · model-written summary
Psyllid nymphal development time did not differ among nitrogen doses.
Verbatim
e0“Nymphal development time did not differ among nitrogen doses.”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Psyllid nymphal survival was dramatically reduced at 200% nitrogen.
Not reportedComparator
Verbatim
e0“Nymphal survival was reduced dramatically at 200% nitrogen treatment.”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Psyllid female wings were longest with 100% nitrogen.
Verbatim
e0“female wings were longest with the 100% nitrogen treatment and shortest with 0%”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Psyllid female wings were shortest with 0% nitrogen.
Verbatim
e0“female wings were longest with the 100% nitrogen treatment and shortest with 0%”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Psyllid wing shape differed significantly at 200% nitrogen versus all other treatments.
- Taxon
- orangee1
- Treatment
- 200% nitrogen treatmente0
- Outcome
- Shape of wingse0
- Comparator
- all other treatmentse0
Not reportedDirection
Verbatim
e0“Shape of wings differed significantly with the 200% nitrogen treatment distinct from all other treatments”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Psyllid wing shape differed between 50% and 100% nitrogen.
Not reportedDirection
Verbatim
e0“the 50% treatment differed from the 100%”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
e2“Shape of wings differed significantly”
Claim · model-written summary
At the end of the study, 50% nitrogen yielded greater leaf chlorophyll than other treatments.
- Taxon
- orangee1
- Treatment
- 50% nitrogen levelse0
- Outcome
- chlorophyll contente0
- Direction
- greatere0
- Comparator
- other treatmentse0
Not reportedOrgan / stage
Verbatim
e0“chlorophyll content in plants receiving 50% nitrogen levels was significantly greater than other treatments at the end of the study.”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
Claim · model-written summary
Leaf chlorophyll did not differ among treatments before nitrogen application.
Verbatim
e0“Chlorophyll content of newly flushed leaves did not differ among treatments before nitrogen treatment”
e1“orange, Citrus × sinensis (L.) Osbeck (Rutaceae), seedlings”
The same questions in other papers
nitrogen · survival · Citrus sinensis (sweet orange)Results agree
1 paper in the same direction as this paper
- positive
nitrogen · physiology: pigments · Citrus sinensis (sweet orange)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.