Seasonal population dynamics of Homalodisca vitripennis (Hemiptera: Cicadellidae) in sweet orange trees maintained under continuous deficit irrigation.
Identifieur interne : 001D67 ( Main/Merge ); précédent : 001D66; suivant : 001D68Seasonal population dynamics of Homalodisca vitripennis (Hemiptera: Cicadellidae) in sweet orange trees maintained under continuous deficit irrigation.
Auteurs : Rodrigo Krugner [États-Unis] ; Russell L. Groves ; Marshall W. Johnson ; Arnel P. Flores ; James R. Hagler ; Joseph G. MorseSource :
- Journal of economic entomology [ 0022-0493 ] ; 2009.
English descriptors
- KwdEn :
- MESH :
- geographic : California.
- growth & development : Hemiptera.
- methods : Agriculture.
- Animals, Citrus sinensis, Fresh Water, Population Dynamics, Seasons, Temperature.
Abstract
A 2-yr study was conducted in a citrus orchard (Citrus sinensis L. Osbeck cultivar Valencia) to determine the influence of plant water stress on the population dynamics of glassy-winged sharpshooter, Homalodisca vitripennis (Germar). Experimental treatments included irrigation at 100% of the crop evapotranspiration rate (ET(c)) and continuous deficit-irrigation regimens at 80 and 60% ET(c). Microclimate and plant conditions monitored included temperature and humidity in the tree canopy, leaf surface temperature, water potential, and fruit quality and yield. Glassy-winged sharpshooter population densities and activity were monitored weekly by a combination of visual inspections, beat net sampling, and trapping. Glassy-winged sharpshooter populations were negatively affected by severe plant water stress; however, population densities were not linearly related to decreasing water availability in plants. Citrus trees irrigated at 60% ET(c) had significantly warmer leaves, lower xylem water potential, and consequently hosted fewer glassy-winged sharpshooter eggs, nymphs, and adults than trees irrigated at 80% ET(c). Citrus trees irrigated at 100% ET(c) hosted similar numbers of glassy-winged sharpshooter stages as trees irrigated at 60% ET(c) and a lower number of glassy-winged sharpshooter nymphs than the 80% ET(c) treatment, specifically during the nymphal density peak in mid-April to early July. Irrigation treatments did not affect populations of monitored natural enemies. Although the adult glassy-winged sharpshooter population was reduced, on average, by 50% in trees under severe water stress, the total number of fruit and number of fruit across several fruit grade categories were significantly lower in the 60% ET(c) than in the 80 and 100% ET(c) irrigation treatments.
PubMed: 19610409
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Seasonal population dynamics of Homalodisca vitripennis (Hemiptera: Cicadellidae) in sweet orange trees maintained under continuous deficit irrigation.</title><author><name sortKey="Krugner, Rodrigo" sort="Krugner, Rodrigo" uniqKey="Krugner R" first="Rodrigo" last="Krugner">Rodrigo Krugner</name><affiliation wicri:level="2"><nlm:affiliation>Department of Entomology, University of California, 3401 Watkins Dr., Riverside, CA 92521, USA. Rodrigo.Krugner@ars.usda.gov</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Entomology, University of California, 3401 Watkins Dr., Riverside, CA 92521</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Groves, Russell L" sort="Groves, Russell L" uniqKey="Groves R" first="Russell L" last="Groves">Russell L. Groves</name></author><author><name sortKey="Johnson, Marshall W" sort="Johnson, Marshall W" uniqKey="Johnson M" first="Marshall W" last="Johnson">Marshall W. Johnson</name></author><author><name sortKey="Flores, Arnel P" sort="Flores, Arnel P" uniqKey="Flores A" first="Arnel P" last="Flores">Arnel P. Flores</name></author><author><name sortKey="Hagler, James R" sort="Hagler, James R" uniqKey="Hagler J" first="James R" last="Hagler">James R. Hagler</name></author><author><name sortKey="Morse, Joseph G" sort="Morse, Joseph G" uniqKey="Morse J" first="Joseph G" last="Morse">Joseph G. Morse</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2009">2009</date><idno type="RBID">pubmed:19610409</idno><idno type="pmid">19610409</idno><idno type="wicri:Area/PubMed/Corpus">000951</idno><idno type="wicri:Area/PubMed/Curation">000951</idno><idno type="wicri:Area/PubMed/Checkpoint">000951</idno><idno type="wicri:Area/Ncbi/Merge">000A28</idno><idno type="wicri:Area/Ncbi/Curation">000A28</idno><idno type="wicri:Area/Ncbi/Checkpoint">000A28</idno><idno type="wicri:doubleKey">0022-0493:2009:Krugner R:seasonal:population:dynamics</idno><idno type="wicri:Area/Main/Merge">001D67</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Seasonal population dynamics of Homalodisca vitripennis (Hemiptera: Cicadellidae) in sweet orange trees maintained under continuous deficit irrigation.</title><author><name sortKey="Krugner, Rodrigo" sort="Krugner, Rodrigo" uniqKey="Krugner R" first="Rodrigo" last="Krugner">Rodrigo Krugner</name><affiliation wicri:level="2"><nlm:affiliation>Department of Entomology, University of California, 3401 Watkins Dr., Riverside, CA 92521, USA. Rodrigo.Krugner@ars.usda.gov</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Entomology, University of California, 3401 Watkins Dr., Riverside, CA 92521</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Groves, Russell L" sort="Groves, Russell L" uniqKey="Groves R" first="Russell L" last="Groves">Russell L. Groves</name></author><author><name sortKey="Johnson, Marshall W" sort="Johnson, Marshall W" uniqKey="Johnson M" first="Marshall W" last="Johnson">Marshall W. Johnson</name></author><author><name sortKey="Flores, Arnel P" sort="Flores, Arnel P" uniqKey="Flores A" first="Arnel P" last="Flores">Arnel P. Flores</name></author><author><name sortKey="Hagler, James R" sort="Hagler, James R" uniqKey="Hagler J" first="James R" last="Hagler">James R. Hagler</name></author><author><name sortKey="Morse, Joseph G" sort="Morse, Joseph G" uniqKey="Morse J" first="Joseph G" last="Morse">Joseph G. Morse</name></author></analytic><series><title level="j">Journal of economic entomology</title><idno type="ISSN">0022-0493</idno><imprint><date when="2009" type="published">2009</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Agriculture (methods)</term><term>Animals</term><term>California</term><term>Citrus sinensis</term><term>Fresh Water</term><term>Hemiptera (growth & development)</term><term>Population Dynamics</term><term>Seasons</term><term>Temperature</term></keywords><keywords scheme="MESH" type="geographic" xml:lang="en"><term>California</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Hemiptera</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Agriculture</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Citrus sinensis</term><term>Fresh Water</term><term>Population Dynamics</term><term>Seasons</term><term>Temperature</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A 2-yr study was conducted in a citrus orchard (Citrus sinensis L. Osbeck cultivar Valencia) to determine the influence of plant water stress on the population dynamics of glassy-winged sharpshooter, Homalodisca vitripennis (Germar). Experimental treatments included irrigation at 100% of the crop evapotranspiration rate (ET(c)) and continuous deficit-irrigation regimens at 80 and 60% ET(c). Microclimate and plant conditions monitored included temperature and humidity in the tree canopy, leaf surface temperature, water potential, and fruit quality and yield. Glassy-winged sharpshooter population densities and activity were monitored weekly by a combination of visual inspections, beat net sampling, and trapping. Glassy-winged sharpshooter populations were negatively affected by severe plant water stress; however, population densities were not linearly related to decreasing water availability in plants. Citrus trees irrigated at 60% ET(c) had significantly warmer leaves, lower xylem water potential, and consequently hosted fewer glassy-winged sharpshooter eggs, nymphs, and adults than trees irrigated at 80% ET(c). Citrus trees irrigated at 100% ET(c) hosted similar numbers of glassy-winged sharpshooter stages as trees irrigated at 60% ET(c) and a lower number of glassy-winged sharpshooter nymphs than the 80% ET(c) treatment, specifically during the nymphal density peak in mid-April to early July. Irrigation treatments did not affect populations of monitored natural enemies. Although the adult glassy-winged sharpshooter population was reduced, on average, by 50% in trees under severe water stress, the total number of fruit and number of fruit across several fruit grade categories were significantly lower in the 60% ET(c) than in the 80 and 100% ET(c) irrigation treatments.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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