Abstract
Date palm trees, Phoenix dactylifera, are the primary crop in Oman. Most date palm cultivation is under the traditional agricultural system. The plants are usually under dense planting, which makes them prone to pest infestation. The main pest attacking date palm crops in Oman is the Dubas bug Ommatissus lybicus. This study integrated modern technology, remote sensing and geographic information systems to determine the number of date palm trees in traditional agriculture locations to find the relationship between date palm tree density and O. lybicus infestation. A local maxima method for tree identification was used to determine the number of date palm trees from high spatial resolution satellite imagery captured by WorldView-3 satellite. Window scale sizes of 3, 5 and 7 m were tested and the results showed that the best window size for date palm trees number detection was 7 m, with an overall estimation accuracy 88.2%. Global regression ordinary least square (OLS) and local geographic weighted regression (GWR) were used to test the relationship between infestation intensity and tree density. The GWR model showed a good positive significant relationship between infestation and tree density in the spring season with R2 = 0.59 and medium positive significant relationship in the autumn season with R2 = 0.30. In contrast, the OLS model results showed a weak positive significant relationship in the spring season with R2 = 0.02, p < 0.05 and insignificant relationship in the autumn season with R2 = 0.01, p > 0.05. The results indicated that there was a geographic effect on the infestation of O. lybicus, which had a greater impact on infestation severity, and that the impact of tree density was higher in the spring season than in autumn season.
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Claims 7
Claim · model-written summary
A 7 m window best detected date palm tree numbers, with 88.2% overall estimation accuracy.
- Taxon
- date palm trees
Phoenix dactyliferae0 - Outcome
- overall estimation accuracye0
- Value
- 88.2%e0
- Qualifier
- 7 me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“best window size for date palm trees number detection was 7 m, with an overall estimation accuracy 88.2%”
Claim · model-written summary
GWR found a significant positive spring relationship between tree density and infestation, R2 = 0.59.
- Taxon
- Date Palm TreePhoenix dactyliferat0
- Interactor
- O. lybicus
Ommatissus lybicuse1peste0 - Outcome
- infestatione0
- Direction
- positivee0
- Value
- R2 = 0.59e0
- Setting
- spring seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The GWR model showed a good positive significant relationship between infestation and tree density in the spring season with R2 = 0.59”
t0“Date Palm Tree”
e1“there was a geographic effect on the infestation of O. lybicus, which had a greater impact on infestation severity”
Claim · model-written summary
GWR found a significant positive autumn relationship between density and infestation, R2 = 0.30.
- Taxon
- Date Palm TreePhoenix dactyliferat0
- Outcome
- infestatione1
- Direction
- positivee0
- Value
- R2 = 0.30e0
- Setting
- autumn seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“medium positive significant relationship in the autumn season with R2 = 0.30”
t0“Date Palm Tree”
e1“The GWR model showed a good positive significant relationship between infestation and tree density in the spring season with R2 = 0.59”
Claim · model-written summary
OLS found a weak significant positive spring relationship, R2 = 0.02.
- Taxon
- Date Palm TreePhoenix dactyliferat0
- Outcome
- relationshipe0
- Direction
- positivee0
- Value
- R2 = 0.02e0
- Setting
- spring seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the OLS model results showed a weak positive significant relationship in the spring season with R2 = 0.02, p < 0.05”
t0“Date Palm Tree”
Claim · model-written summary
OLS found an insignificant autumn relationship, R2 = 0.01.
- Taxon
- Date Palm TreePhoenix dactyliferat0
- Outcome
- relationshipe0
- Value
- R2 = 0.01e0
- Setting
- autumn seasone0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insignificant relationship in the autumn season with R2 = 0.01, p > 0.05”
t0“Date Palm Tree”
Claim · model-written summary
Geography affected O. lybicus infestation more than tree density.
- Taxon
- Date Palm TreePhoenix dactyliferat0
- Interactor
- O. lybicusOmmatissus lybicuse0pest
- Outcome
- infestation of O. lybicuse0
- Direction
- greatere0
- Setting
- geographice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a geographic effect on the infestation of O. lybicus, which had a greater impact on infestation severity”
t0“Date Palm Tree”
Claim · model-written summary
Tree density affected infestation more in spring than autumn.
- Taxon
- Date Palm TreePhoenix dactyliferat0
- Outcome
- impact of tree densitye0
- Direction
- highere0
- Comparator
- autumn seasone0
- Setting
- spring seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the impact of tree density was higher in the spring season than in autumn season”
t0“Date Palm Tree”