Effect of intercrops on thrips species composition and population abundance on French beans in Kenya
Identifieur interne : 000F09 ( Istex/Corpus ); précédent : 000F08; suivant : 000F10Effect of intercrops on thrips species composition and population abundance on French beans in Kenya
Auteurs : J. O. Nyasani ; R. Meyhöfer ; S. Subramanian ; H. PoehlingSource :
- Entomologia Experimentalis et Applicata [ 0013-8703 ] ; 2012-03.
English descriptors
- KwdEn :
Abstract
The study aimed at determining thrips species composition and thrips population density on French bean planted as a sole crop and as an intercrop with either sunflower, Irish potato, or baby corn, in various combinations. Field experiments were conducted in two seasons to examine: (1) thrips population development and thrips species composition over time, (2) effect of intercrops on thrips population density and natural enemies, and (3) effect of intercrops on French bean yield. The experiments were conducted at the Kenya Agricultural Research Institute, Embu, Kenya in a randomized complete block design with four replicates. The thrips population on French beans increased with time. It showed a peak at the flowering stage then started declining when the crops were nearing senescence. French beans hosted four thrips species, Megalurothrips sjostedti (Trybom), Frankliniella schultzei (Trybom), Frankliniella occidentalis (Pergande), and Hydatothrips aldolfifriderici (Karny) (all Thysanoptera: Thripidae) in order of decreasing abundance. The main thrips species on Irish potato and sunflower was F. schultzei. Baby corn hosted only Frankliniella williamsi (Hood) and Thrips pusillus (Bagnall). A monocrop of French bean hosted more thrips than a French bean intercrop mix. Thrips natural enemies such as Orius spp. and Ceranisus spp. were recorded in all crop plants but in especially high numbers on French bean and baby corn, respectively. Plots with French bean alone had about 1.4 times higher yields compared to intercropped plots of French bean with sunflower and French bean with baby corn. However, the percentage of pods that could get rejected on the market due to thrips damage was highest on plots with French bean alone (68 and 63%) and lowest on plots with French bean and baby corn (35 and 37%) in the first and second seasons, respectively. This study showed that a complex of thrips is found in the field and its composition varies with crop stage and species. Intercropping French bean with other crops compromises on French bean yield but reduces damage to the French bean pods, thereby enhancing marketable yield.
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DOI: 10.1111/j.1570-7458.2011.01217.x
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<front><div type="abstract" xml:lang="en">The study aimed at determining thrips species composition and thrips population density on French bean planted as a sole crop and as an intercrop with either sunflower, Irish potato, or baby corn, in various combinations. Field experiments were conducted in two seasons to examine: (1) thrips population development and thrips species composition over time, (2) effect of intercrops on thrips population density and natural enemies, and (3) effect of intercrops on French bean yield. The experiments were conducted at the Kenya Agricultural Research Institute, Embu, Kenya in a randomized complete block design with four replicates. The thrips population on French beans increased with time. It showed a peak at the flowering stage then started declining when the crops were nearing senescence. French beans hosted four thrips species, Megalurothrips sjostedti (Trybom), Frankliniella schultzei (Trybom), Frankliniella occidentalis (Pergande), and Hydatothrips aldolfifriderici (Karny) (all Thysanoptera: Thripidae) in order of decreasing abundance. The main thrips species on Irish potato and sunflower was F. schultzei. Baby corn hosted only Frankliniella williamsi (Hood) and Thrips pusillus (Bagnall). A monocrop of French bean hosted more thrips than a French bean intercrop mix. Thrips natural enemies such as Orius spp. and Ceranisus spp. were recorded in all crop plants but in especially high numbers on French bean and baby corn, respectively. Plots with French bean alone had about 1.4 times higher yields compared to intercropped plots of French bean with sunflower and French bean with baby corn. However, the percentage of pods that could get rejected on the market due to thrips damage was highest on plots with French bean alone (68 and 63%) and lowest on plots with French bean and baby corn (35 and 37%) in the first and second seasons, respectively. This study showed that a complex of thrips is found in the field and its composition varies with crop stage and species. Intercropping French bean with other crops compromises on French bean yield but reduces damage to the French bean pods, thereby enhancing marketable yield.</div>
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<correspondenceTo> S. Subramanian, International Centre of Insect Physiology and Ecology, PO Box 30772‐00100, Nairobi, Kenya. E‐mail: <email>ssubramania@icipe.org</email>
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<contentMeta><unparsedEditorialHistory>Accepted: 12 December 2011</unparsedEditorialHistory>
<countGroup><count type="figureTotal" number="5"></count>
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<titleGroup><title type="main">Effect of intercrops on thrips species composition and population abundance on French beans in Kenya</title>
<title type="shortAuthors"><i>Nyasani</i>
et al.</title>
<title type="short"><i>Effect of intercrops on thrips</i>
</title>
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<creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1 #a2 #a3"><personName><givenNames>J. O.</givenNames>
<familyName>Nyasani</familyName>
</personName>
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<creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>R.</givenNames>
<familyName>Meyhöfer</familyName>
</personName>
</creator>
<creator creatorRole="author" xml:id="cr3" affiliationRef="#a3" corresponding="yes"><personName><givenNames>S.</givenNames>
<familyName>Subramanian</familyName>
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<creator creatorRole="author" xml:id="cr4" affiliationRef="#a2"><personName><givenNames>H.‐M.</givenNames>
<familyName>Poehling</familyName>
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<affiliationGroup><affiliation xml:id="a1" countryCode="KE"><unparsedAffiliation>Kenya Agricultural Research Institute, PO Box 27‐60100, Embu, Kenya</unparsedAffiliation>
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<affiliation xml:id="a2" countryCode="DE"><unparsedAffiliation>Leibniz Universität Hannover, Institute of Plant Diseases and Plant Protection, Herrenhäuser Strasse 2, 30419 Hannover, Germany</unparsedAffiliation>
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<affiliation xml:id="a3" countryCode="KE"><unparsedAffiliation>International Centre of Insect Physiology and Ecology, PO Box 30772‐00100, Nairobi, Kenya</unparsedAffiliation>
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<keywordGroup xml:lang="en"><keyword xml:id="k1"><i>Frankliniella occidentalis</i>
</keyword>
<keyword xml:id="k2"><i>Frankliniella schultzei</i>
</keyword>
<keyword xml:id="k3"><i>Hydatothrips aldolfifriderici</i>
</keyword>
<keyword xml:id="k4"><i>Megalurothrips sjostedti</i>
</keyword>
<keyword xml:id="k5">intercropping</keyword>
<keyword xml:id="k6">Thysanoptera</keyword>
<keyword xml:id="k7">Thripidae</keyword>
<keyword xml:id="k8">Fabaceae</keyword>
<keyword xml:id="k9"><i>Phaseolus vulgaris</i>
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<keyword xml:id="k10">natural enemies</keyword>
<keyword xml:id="k11">associational resistance</keyword>
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<abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title>
<p>The study aimed at determining thrips species composition and thrips population density on French bean planted as a sole crop and as an intercrop with either sunflower, Irish potato, or baby corn, in various combinations. Field experiments were conducted in two seasons to examine: (1) thrips population development and thrips species composition over time, (2) effect of intercrops on thrips population density and natural enemies, and (3) effect of intercrops on French bean yield. The experiments were conducted at the Kenya Agricultural Research Institute, Embu, Kenya in a randomized complete block design with four replicates. The thrips population on French beans increased with time. It showed a peak at the flowering stage then started declining when the crops were nearing senescence. French beans hosted four thrips species, <i>Megalurothrips sjostedti</i>
(Trybom), <i>Frankliniella schultzei</i>
(Trybom), <i>Frankliniella occidentalis</i>
(Pergande), and <i>Hydatothrips aldolfifriderici</i>
(Karny) (all Thysanoptera: Thripidae) in order of decreasing abundance. The main thrips species on Irish potato and sunflower was <i>F. schultzei</i>
. Baby corn hosted only <i>Frankliniella williamsi</i>
(Hood) and <i>Thrips pusillus</i>
(Bagnall). A monocrop of French bean hosted more thrips than a French bean intercrop mix. Thrips natural enemies such as <i>Orius</i>
spp. and <i>Ceranisus</i>
spp. were recorded in all crop plants but in especially high numbers on French bean and baby corn, respectively. Plots with French bean alone had about 1.4 times higher yields compared to intercropped plots of French bean with sunflower and French bean with baby corn. However, the percentage of pods that could get rejected on the market due to thrips damage was highest on plots with French bean alone (68 and 63%) and lowest on plots with French bean and baby corn (35 and 37%) in the first and second seasons, respectively. This study showed that a complex of thrips is found in the field and its composition varies with crop stage and species. Intercropping French bean with other crops compromises on French bean yield but reduces damage to the French bean pods, thereby enhancing marketable yield.</p>
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<titleInfo type="abbreviated" lang="en"><title>Effect of intercrops on thrips</title>
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<titleInfo type="alternative" contentType="CDATA" lang="en"><title>Effect of intercrops on thrips species composition and population abundance on French beans in Kenya</title>
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<name type="personal"><namePart type="given">J. O.</namePart>
<namePart type="family">Nyasani</namePart>
<affiliation>Kenya Agricultural Research Institute, PO Box 27‐60100, Embu, Kenya</affiliation>
<affiliation>Leibniz Universität Hannover, Institute of Plant Diseases and Plant Protection, Herrenhäuser Strasse 2, 30419 Hannover, Germany</affiliation>
<affiliation>International Centre of Insect Physiology and Ecology, PO Box 30772‐00100, Nairobi, Kenya</affiliation>
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<name type="personal"><namePart type="given">R.</namePart>
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<affiliation>Leibniz Universität Hannover, Institute of Plant Diseases and Plant Protection, Herrenhäuser Strasse 2, 30419 Hannover, Germany</affiliation>
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<name type="personal"><namePart type="given">S.</namePart>
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<affiliation>International Centre of Insect Physiology and Ecology, PO Box 30772‐00100, Nairobi, Kenya</affiliation>
<affiliation>E-mail: ssubramania@icipe.org</affiliation>
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<name type="personal"><namePart type="given">H.‐M.</namePart>
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<edition>Accepted: 12 December 2011</edition>
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<abstract lang="en">The study aimed at determining thrips species composition and thrips population density on French bean planted as a sole crop and as an intercrop with either sunflower, Irish potato, or baby corn, in various combinations. Field experiments were conducted in two seasons to examine: (1) thrips population development and thrips species composition over time, (2) effect of intercrops on thrips population density and natural enemies, and (3) effect of intercrops on French bean yield. The experiments were conducted at the Kenya Agricultural Research Institute, Embu, Kenya in a randomized complete block design with four replicates. The thrips population on French beans increased with time. It showed a peak at the flowering stage then started declining when the crops were nearing senescence. French beans hosted four thrips species, Megalurothrips sjostedti (Trybom), Frankliniella schultzei (Trybom), Frankliniella occidentalis (Pergande), and Hydatothrips aldolfifriderici (Karny) (all Thysanoptera: Thripidae) in order of decreasing abundance. The main thrips species on Irish potato and sunflower was F. schultzei. Baby corn hosted only Frankliniella williamsi (Hood) and Thrips pusillus (Bagnall). A monocrop of French bean hosted more thrips than a French bean intercrop mix. Thrips natural enemies such as Orius spp. and Ceranisus spp. were recorded in all crop plants but in especially high numbers on French bean and baby corn, respectively. Plots with French bean alone had about 1.4 times higher yields compared to intercropped plots of French bean with sunflower and French bean with baby corn. However, the percentage of pods that could get rejected on the market due to thrips damage was highest on plots with French bean alone (68 and 63%) and lowest on plots with French bean and baby corn (35 and 37%) in the first and second seasons, respectively. This study showed that a complex of thrips is found in the field and its composition varies with crop stage and species. Intercropping French bean with other crops compromises on French bean yield but reduces damage to the French bean pods, thereby enhancing marketable yield.</abstract>
<subject lang="en"><genre>keywords</genre>
<topic>Frankliniella occidentalis</topic>
<topic>Frankliniella schultzei</topic>
<topic>Hydatothrips aldolfifriderici</topic>
<topic>Megalurothrips sjostedti</topic>
<topic>intercropping</topic>
<topic>Thysanoptera</topic>
<topic>Thripidae</topic>
<topic>Fabaceae</topic>
<topic>Phaseolus vulgaris</topic>
<topic>natural enemies</topic>
<topic>associational resistance</topic>
</subject>
<relatedItem type="host"><titleInfo><title>Entomologia Experimentalis et Applicata</title>
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<identifier type="ISSN">0013-8703</identifier>
<identifier type="eISSN">1570-7458</identifier>
<identifier type="DOI">10.1111/(ISSN)1570-7458</identifier>
<identifier type="PublisherID">EEA</identifier>
<part><date>2012</date>
<detail type="volume"><caption>vol.</caption>
<number>142</number>
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<detail type="issue"><caption>no.</caption>
<number>3</number>
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