Abstract
Abstract The tolerance of seven varieties of cassava (Manihot esculenta Crantz), Poinsettia (Euphorbia pulcherrima Wild.), Talinum (Talinum triangulare Jacq.) and Faux‐caoutchouc (a hybrid of M. esculenta and M. glaziovii Mull. Arg.) to the cassava mealybug Phenacoccus manihoti Matt. Ferr., was measured in the laboratory, by quantifying morphological and physiological changes in the growth of plants infested with P. manihoti. A 2‐month infestation by 100 mealybugs decreased the total leaf area and the leaf area ratio F but did not modify total dry weight, relative growth rate R or net assimilation rate E of plants studied. The decrease in leaf area was extremely variable and depended on plant species and variety. The effect of infestation on dry weight of different plant organs was not homogeneous, suggesting that translocation of nutrients made during photosynthesis was modified. In cassava the decrease in leaf area, without significant change in leaf dry weight, appeared to be due to physiological changes in plants similar to those induced by water stress. The degree of tolerance was not related to the plant species (cassava varieties Ganfo, Incoza and Zanaga were as tolerant as Talinum and Faux‐caoutchouc). Keywords: Phenacoccus manihoticassavainsect‐plant relationshipantibiosistolerancevarietal resistanceCongo
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Claims 6
Claim · model-written summary
A two-month infestation by 100 mealybugs decreased host plant total leaf area and leaf area ratio.
- Taxon
- cassava
Manihot esculentae1 - Treatment
- 2‐month infestation by 100 mealybugse0
- Interactor
- Phenacoccus manihoti
_dan_semut_merah_(Solenopsis)_pada_batang_daun_Pepaya_(Carica_Papaya_L).jpg?width=60)
Phenacoccus manihotie1pest - Outcome
- total leaf area and the leaf area ratio Fe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_dan_semut_merah_(Solenopsis)_pada_batang_daun_Pepaya_(Carica_Papaya_L).jpg?width=500)
Verbatim
e0“A 2‐month infestation by 100 mealybugs decreased the total leaf area and the leaf area ratio F but did not modify total dry weight, relative growth rate R or net assimilation rate E of plants studied.”
e1“cassava mealybug Phenacoccus manihoti Matt. Ferr.”
Claim · model-written summary
Infestation did not modify plant total dry weight, relative growth rate or net assimilation rate.
- Taxon
- cassavaManihot esculentae1
- Treatment
- 2‐month infestation by 100 mealybugse0
- Interactor
- Phenacoccus manihotiPhenacoccus manihotie1pest
- Outcome
- total dry weight, relative growth rate R or net assimilation rate Ee0
- Direction
- did not modifye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 2‐month infestation by 100 mealybugs decreased the total leaf area and the leaf area ratio F but did not modify total dry weight, relative growth rate R or net assimilation rate E of plants studied.”
e1“cassava mealybug Phenacoccus manihoti Matt. Ferr.”
Claim · model-written summary
The leaf area decrease varied by plant species and variety.
- Taxon
- cassavaManihot esculentae1
- Material
- seven varietiese1
- Outcome
- decrease in leaf areae0
- Qualifier
- extremely variablee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in leaf area was extremely variable and depended on plant species and variety.”
e1“seven varieties of cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Infestation effects on dry weight differed among plant organs.
- Taxon
- cassavaManihot esculentae1
- Organ / stage
- different plant organse0
- Treatment
- infestatione0
- Outcome
- dry weight of different plant organse0
- Direction
- not homogeneouse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of infestation on dry weight of different plant organs was not homogeneous, suggesting that translocation of nutrients made during photosynthesis was modified.”
e1“seven varieties of cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Cassava leaf area declined without a significant change in leaf dry weight.
- Taxon
- cassavaManihot esculentae0
- Treatment
- infested with P. manihotie2
- Interactor
- Phenacoccus manihotiPhenacoccus manihotie1pest
- Outcome
- leaf dry weighte0
- Direction
- without significant changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In cassava the decrease in leaf area, without significant change in leaf dry weight, appeared to be due to physiological changes in plants similar to those induced by water stress.”
e1“cassava mealybug Phenacoccus manihoti Matt. Ferr.”
e2“plants infested with P. manihoti”
Claim · model-written summary
Tolerance to the mealybug was unrelated to plant species.
- Taxon
- cassavaManihot esculentae0
- Material
- cassava varieties Ganfo, Incoza and Zanagae0
- Interactor
- Phenacoccus manihotiPhenacoccus manihotie1pest
- Outcome
- degree of tolerancee0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of tolerance was not related to the plant species (cassava varieties Ganfo, Incoza and Zanaga were as tolerant as Talinum and Faux‐caoutchouc).”
e1“cassava mealybug Phenacoccus manihoti Matt. Ferr.”
The same questions in other papers
Phenacoccus manihoti · growth · Manihot esculenta (cassava)Results agree
2 papers in the same direction as this paper
- no effect
- negative
infection · growth · Manihot esculenta (cassava)Results agree
6 papers in the same direction as this paper
- no effect
- no effect
- negative
3 papers more in this group
See all 7 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.