Abstract
A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970. Recent studies, using tests considered diagnostic for citrus blight in Florida, indicated the disease could be classified into two types: a typical blight or "declinio" type (CDB-T) and an atypical type (CDB-A). While both showed reduced water uptake and hydraulic conductivity rate, relatively high levels of water-soluble phenolics, potassium, and a greater number of vessel plugs than in healthy trees, only CDB-Taffected trees had higher zinc in outer trunk wood tissues. Attempts to determine any involvement of fungi, bacteria, and viruses in the occurrence of either disorder, and applications of growth-promoting substances, organic and inorganic fertilizers, mulching, scion-rooting, and severe pruning to induce tree recovery from decline symptoms have been unsuccessful.
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Claims 10
Claim · model-written summary
Declinio-affected citrus trees showed reduced water uptake and hydraulic conductivity rate compared with healthy trees.
- Outcome
- water uptake and hydraulic conductivity ratee1
- Direction
- reducede1
- Comparator
- healthy treese1
- Setting
- State of Bahia, Brazile0
CitrusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e1“While both showed reduced water uptake and hydraulic conductivity rate, relatively high levels of water-soluble phenolics, potassium, and a greater number of vessel plugs than in healthy trees”
Claim · model-written summary
Declinio-affected citrus trees had relatively high levels of water-soluble phenolics and potassium compared with healthy trees.
- Outcome
- water-soluble phenolics, potassiume1
- Direction
- relatively highe1
- Comparator
- healthy treese1
- Setting
- State of Bahia, Brazile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e1“While both showed reduced water uptake and hydraulic conductivity rate, relatively high levels of water-soluble phenolics, potassium, and a greater number of vessel plugs than in healthy trees”
Claim · model-written summary
Declinio-affected citrus trees had a greater number of vessel plugs than healthy trees.
- Outcome
- vessel plugse1
- Direction
- greater numbere1
- Comparator
- healthy treese1
- Setting
- State of Bahia, Brazile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e1“While both showed reduced water uptake and hydraulic conductivity rate, relatively high levels of water-soluble phenolics, potassium, and a greater number of vessel plugs than in healthy trees”
Claim · model-written summary
Only CDB-T affected citrus trees had higher zinc in outer trunk wood tissues.
- Organ / stage
- outer trunk wood tissuese2
- Outcome
- zince2
- Direction
- highere2
- Qualifier
- only CDB-Taffected treese2
- Setting
- State of Bahia, Brazile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e2“only CDB-Taffected trees had higher zinc in outer trunk wood tissues”
Claim · model-written summary
Attempts to find an involvement of fungi, bacteria and viruses in citrus declinio were unsuccessful.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e3“Attempts to determine any involvement of fungi, bacteria, and viruses in the occurrence of either disorder”
Claim · model-written summary
Growth-promoting substances did not induce recovery of citrus trees from decline symptoms.
- Treatment
- growth-promoting substancese4
- Outcome
- tree recovery from decline symptomse4
- Qualifier
- have been unsuccessfule4
- Setting
- State of Bahia, Brazile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e4“applications of growth-promoting substances, organic and inorganic fertilizers, mulching, scion-rooting, and severe pruning to induce tree recovery from decline symptoms have been unsuccessful”
Claim · model-written summary
Organic and inorganic fertilizers did not induce recovery of citrus trees from decline symptoms.
- Treatment
- organic and inorganic fertilizerse4
- Outcome
- tree recovery from decline symptomse4
- Qualifier
- have been unsuccessfule4
- Setting
- State of Bahia, Brazile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e4“applications of growth-promoting substances, organic and inorganic fertilizers, mulching, scion-rooting, and severe pruning to induce tree recovery from decline symptoms have been unsuccessful”
Claim · model-written summary
Mulching did not induce recovery of citrus trees from decline symptoms.
- Treatment
- mulchinge4
- Outcome
- tree recovery from decline symptomse4
- Qualifier
- have been unsuccessfule4
- Setting
- State of Bahia, Brazile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e4“applications of growth-promoting substances, organic and inorganic fertilizers, mulching, scion-rooting, and severe pruning to induce tree recovery from decline symptoms have been unsuccessful”
Claim · model-written summary
Scion-rooting did not induce recovery of citrus trees from decline symptoms.
- Treatment
- scion-rootinge4
- Outcome
- tree recovery from decline symptomse4
- Qualifier
- have been unsuccessfule4
- Setting
- State of Bahia, Brazile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e4“applications of growth-promoting substances, organic and inorganic fertilizers, mulching, scion-rooting, and severe pruning to induce tree recovery from decline symptoms have been unsuccessful”
Claim · model-written summary
Severe pruning did not induce recovery of citrus trees from decline symptoms.
- Treatment
- severe pruninge4
- Outcome
- tree recovery from decline symptomse4
- Qualifier
- have been unsuccessfule4
- Setting
- State of Bahia, Brazile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A disorder of citrus trees of undetermined cause, involving wilt, defoliation and general decline, has been observed in the State of Bahia, Brazil since 1970”
e4“applications of growth-promoting substances, organic and inorganic fertilizers, mulching, scion-rooting, and severe pruning to induce tree recovery from decline symptoms have been unsuccessful”
The same questions in other papers
mulching · disease · CitrusPositive and negative results
2 in the opposite direction
- positive
- positive
pruning · disease · CitrusPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →fertilization · disease · CitrusPositive and negative results
7 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →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.