Evaluation of a model for prediction of postbloom fruit drop of citrus
Identifieur interne : 000B72 ( PascalFrancis/Corpus ); précédent : 000B71; suivant : 000B73Evaluation of a model for prediction of postbloom fruit drop of citrus
Auteurs : L. W. Timmer ; S. E. ZitkoSource :
- Plant disease [ 0191-2917 ] ; 1996.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Postbloom fruit drop, caused by Colletotrichum acutatum, produces orange-brown lesions on flower petals, abscission of fruitlets, and formation of persistent calyces (buttons). A previously developed model that predicts the percentage of flower infection 3 to 4 days in advance based on the current number of infected flowers and rainfall for the previous 5 days was evaluated in three navel and Valencia orange groves in 1993 and in five groves each in 1994 and 1995. There was a significant (P ≤ 0.05) relationship between the predicted and observed percentages of affected flowers in seven of the nine cases in which sufficient disease developed to warrant fungicide applications (R2 = 0.38 to 0.86). From one to three applications were made in each of these cases based on the model predictions. In many of the cases, the fungicide applications reduced the area under the curve for disease incidence on flowers and the number of buttons formed compared to the unsprayed controls. Fungicide applications increased fruit counts (P ≤ 0.10) in eight of the nine cases with increases over the unsprayed controls ranging from 25 to 523%. Model predictions were accurate except when rain events were of short duration and tree canopies dried quickly. Model-based decisions on fungicide applications resulted in reduced disease, large increases in fruit production, and elimination of unnecessary sprays.
Notice en format standard (ISO 2709)
Pour connaître la documentation sur le format Inist Standard.
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Format Inist (serveur)
NO : | PASCAL 96-0209461 INIST |
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ET : | Evaluation of a model for prediction of postbloom fruit drop of citrus |
AU : | TIMMER (L. W.); ZITKO (S. E.) |
AF : | University of Florida, Citrus Research and Education Center, 700 Experiment Station Road/Lake Alfred 33850/Etats-Unis (1 aut., 2 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Plant disease; ISSN 0191-2917; Coden PLDIDE; Etats-Unis; Da. 1996; Vol. 80; No. 4; Pp. 380-383; Bibl. 11 ref. |
LA : | Anglais |
EA : | Postbloom fruit drop, caused by Colletotrichum acutatum, produces orange-brown lesions on flower petals, abscission of fruitlets, and formation of persistent calyces (buttons). A previously developed model that predicts the percentage of flower infection 3 to 4 days in advance based on the current number of infected flowers and rainfall for the previous 5 days was evaluated in three navel and Valencia orange groves in 1993 and in five groves each in 1994 and 1995. There was a significant (P ≤ 0.05) relationship between the predicted and observed percentages of affected flowers in seven of the nine cases in which sufficient disease developed to warrant fungicide applications (R2 = 0.38 to 0.86). From one to three applications were made in each of these cases based on the model predictions. In many of the cases, the fungicide applications reduced the area under the curve for disease incidence on flowers and the number of buttons formed compared to the unsprayed controls. Fungicide applications increased fruit counts (P ≤ 0.10) in eight of the nine cases with increases over the unsprayed controls ranging from 25 to 523%. Model predictions were accurate except when rain events were of short duration and tree canopies dried quickly. Model-based decisions on fungicide applications resulted in reduced disease, large increases in fruit production, and elimination of unnecessary sprays. |
CC : | 002A34G05A |
FD : | Citrus sinensis; Colletotrichum acutatum; Epidémiologie; Modèle prévision; Méthode statistique; Lutte chimique; Epoque traitement; Californie; Essai en champ; Verger; Benomyl; Ferbam |
FG : | Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Fungi Imperfecti; Fungi; Thallophyta; Etats Unis; Amérique du Nord; Amérique; Carbamate; Fongicide; Phytopathogène; Agrume |
ED : | Citrus sinensis; Colletotrichum acutatum; Epidemiology; Forecast model; Statistical method; Chemical control; Application time; California; Field experiment; Orchard; Benomyl; Ferbam |
EG : | Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Fungi Imperfecti; Fungi; Thallophyta; United States; North America; America; Carbamate; Fungicide; Plant pathogen; Citrus fruit |
SD : | Citrus sinensis; Colletotrichum acutatum; Epidemiología; Modelo previsión; Método estadístico; Lucha química; Epoca tratamiento; California; Ensayo en campo; Huerto; Benomil; Ferbame |
LO : | INIST-12673.354000044767930060 |
ID : | 96-0209461 |
Links to Exploration step
Pascal:96-0209461Le document en format XML
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<term>Colletotrichum acutatum</term>
<term>Epidemiology</term>
<term>Ferbam</term>
<term>Field experiment</term>
<term>Forecast model</term>
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<term>Statistical method</term>
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<term>Colletotrichum acutatum</term>
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<front><div type="abstract" xml:lang="en">Postbloom fruit drop, caused by Colletotrichum acutatum, produces orange-brown lesions on flower petals, abscission of fruitlets, and formation of persistent calyces (buttons). A previously developed model that predicts the percentage of flower infection 3 to 4 days in advance based on the current number of infected flowers and rainfall for the previous 5 days was evaluated in three navel and Valencia orange groves in 1993 and in five groves each in 1994 and 1995. There was a significant (P ≤ 0.05) relationship between the predicted and observed percentages of affected flowers in seven of the nine cases in which sufficient disease developed to warrant fungicide applications (R<sup>2</sup>
= 0.38 to 0.86). From one to three applications were made in each of these cases based on the model predictions. In many of the cases, the fungicide applications reduced the area under the curve for disease incidence on flowers and the number of buttons formed compared to the unsprayed controls. Fungicide applications increased fruit counts (P ≤ 0.10) in eight of the nine cases with increases over the unsprayed controls ranging from 25 to 523%. Model predictions were accurate except when rain events were of short duration and tree canopies dried quickly. Model-based decisions on fungicide applications resulted in reduced disease, large increases in fruit production, and elimination of unnecessary sprays.</div>
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<fC01 i1="01" l="ENG"><s0>Postbloom fruit drop, caused by Colletotrichum acutatum, produces orange-brown lesions on flower petals, abscission of fruitlets, and formation of persistent calyces (buttons). A previously developed model that predicts the percentage of flower infection 3 to 4 days in advance based on the current number of infected flowers and rainfall for the previous 5 days was evaluated in three navel and Valencia orange groves in 1993 and in five groves each in 1994 and 1995. There was a significant (P ≤ 0.05) relationship between the predicted and observed percentages of affected flowers in seven of the nine cases in which sufficient disease developed to warrant fungicide applications (R<sup>2</sup>
= 0.38 to 0.86). From one to three applications were made in each of these cases based on the model predictions. In many of the cases, the fungicide applications reduced the area under the curve for disease incidence on flowers and the number of buttons formed compared to the unsprayed controls. Fungicide applications increased fruit counts (P ≤ 0.10) in eight of the nine cases with increases over the unsprayed controls ranging from 25 to 523%. Model predictions were accurate except when rain events were of short duration and tree canopies dried quickly. Model-based decisions on fungicide applications resulted in reduced disease, large increases in fruit production, and elimination of unnecessary sprays.</s0>
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<s2>NG</s2>
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<s2>NG</s2>
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<fC07 i1="11" i2="X" l="FRE"><s0>Carbamate</s0>
<s2>NK</s2>
<s2>FF</s2>
<s5>13</s5>
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<fC07 i1="11" i2="X" l="ENG"><s0>Carbamate</s0>
<s2>NK</s2>
<s2>FF</s2>
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<fC07 i1="12" i2="X" l="FRE"><s0>Fongicide</s0>
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<s5>17</s5>
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<s5>43</s5>
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<s5>43</s5>
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<server><NO>PASCAL 96-0209461 INIST</NO>
<ET>Evaluation of a model for prediction of postbloom fruit drop of citrus</ET>
<AU>TIMMER (L. W.); ZITKO (S. E.)</AU>
<AF>University of Florida, Citrus Research and Education Center, 700 Experiment Station Road/Lake Alfred 33850/Etats-Unis (1 aut., 2 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Plant disease; ISSN 0191-2917; Coden PLDIDE; Etats-Unis; Da. 1996; Vol. 80; No. 4; Pp. 380-383; Bibl. 11 ref.</SO>
<LA>Anglais</LA>
<EA>Postbloom fruit drop, caused by Colletotrichum acutatum, produces orange-brown lesions on flower petals, abscission of fruitlets, and formation of persistent calyces (buttons). A previously developed model that predicts the percentage of flower infection 3 to 4 days in advance based on the current number of infected flowers and rainfall for the previous 5 days was evaluated in three navel and Valencia orange groves in 1993 and in five groves each in 1994 and 1995. There was a significant (P ≤ 0.05) relationship between the predicted and observed percentages of affected flowers in seven of the nine cases in which sufficient disease developed to warrant fungicide applications (R<sup>2</sup>
= 0.38 to 0.86). From one to three applications were made in each of these cases based on the model predictions. In many of the cases, the fungicide applications reduced the area under the curve for disease incidence on flowers and the number of buttons formed compared to the unsprayed controls. Fungicide applications increased fruit counts (P ≤ 0.10) in eight of the nine cases with increases over the unsprayed controls ranging from 25 to 523%. Model predictions were accurate except when rain events were of short duration and tree canopies dried quickly. Model-based decisions on fungicide applications resulted in reduced disease, large increases in fruit production, and elimination of unnecessary sprays.</EA>
<CC>002A34G05A</CC>
<FD>Citrus sinensis; Colletotrichum acutatum; Epidémiologie; Modèle prévision; Méthode statistique; Lutte chimique; Epoque traitement; Californie; Essai en champ; Verger; Benomyl; Ferbam</FD>
<FG>Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Fungi Imperfecti; Fungi; Thallophyta; Etats Unis; Amérique du Nord; Amérique; Carbamate; Fongicide; Phytopathogène; Agrume</FG>
<ED>Citrus sinensis; Colletotrichum acutatum; Epidemiology; Forecast model; Statistical method; Chemical control; Application time; California; Field experiment; Orchard; Benomyl; Ferbam</ED>
<EG>Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Fungi Imperfecti; Fungi; Thallophyta; United States; North America; America; Carbamate; Fungicide; Plant pathogen; Citrus fruit</EG>
<SD>Citrus sinensis; Colletotrichum acutatum; Epidemiología; Modelo previsión; Método estadístico; Lucha química; Epoca tratamiento; California; Ensayo en campo; Huerto; Benomil; Ferbame</SD>
<LO>INIST-12673.354000044767930060</LO>
<ID>96-0209461</ID>
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