The importance of pH in food selection by the tobacco whitefly,Bemisia tabaci

Berlinger, M. J.; Magal, Z.; Benzioni, A.

doi:10.1007/bf02980686

Cited by 32 publications

(15 citation statements)

References 5 publications

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“…Esse comportamento pode estar associado ao pH elevado encontrado em folíolos desse genótipo, conforme discutido por Berlinger et al (1983), para B. tabaci em folhas de algodão, porém não exclusivamente determinado por esse fator. É interessante verificar que LA1609 é relativamente pouco pubescente, o que poderia ser um fator desfavorável à seleção hospedeira.…”

Section: Genótipounclassified

Exsudato glandular de genótipos de tomateiro e desenvolvimento de Bemisia tabaci (Genn.) (Sternorryncha: Aleyrodidae) biótipo B

Fancelli¹,

Vendramim²,

Frighetto

et al. 2005

Neotrop. Entomol.

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-Bemisia tabaci (Genn.) is one of the most important tomato pests in Brazil and causes severe losses due to the sap suction, the induction of the irregular ripening of the fruit and virus transmission. The objective of this study was to determine the effect of exudates released by the glandular trichomes on the development of B. tabaci biotype B on eight tomato genotypes, under greenhouse conditions. The experiment was arranged as a factorial scheme (genotype x exudate) in a randomized block design, with three replications, being the genotypes evaluated in two conditions (with and without exudate). Whitefly adults were transferred to a voile cage for 24h. The variables evaluated were number of eggs and viability, incubation period, number of nymphs, duration and viability of the nymphal stage. Trichome counts and determination of pH and acylglucose content were made for all the genotypes. Intact leaflets of LA716 were less accepted for oviposition than leaflets without exudate, which suggests an antixenotic effect. Antixenotic resistance in LA1739 and PI134417 was not associated to the glandular exudate. The effect of exudates on the insect oviposition was explained by the acylglucose content. The pH showed secondary role on the whitefly oviposition. Trichomes density improved the insect development. LA1584 reduced the insect survival and increased its cycle, besides promoting an intermediate oviposition. For this reason, it can be useful in breeding programs. However, further studies are needed to determine the potential of this genotype and hybrids for future utilization in integrated pest management.KEY WORDS: Lycopersicon, silverleaf whitefly, Bemisia argentifolii RESUMO -Bemisia tabaci (Genn.) é uma das principais pragas do tomateiro no Brasil, provocando severas perdas devido à sucção de seiva, indução do amadurecimento irregular dos frutos e transmissão de viroses. O objetivo deste trabalho foi determinar o efeito de tricomas glandulares no desenvolvimento de B. tabaci biótipo B em oito genótipos de tomateiro, em casa de vegetação. Utilizou-se o delineamento de blocos ao acaso, em arranjo fatorial (genótipo x exsudato), com três repetições, sendo os genótipos avaliados na condição com e sem exsudato. Adultos da mosca-branca foram transferidos para uma gaiola de voil, onde permaneceram durante 24h. As variáveis avaliadas foram número de ovos e viabilidade, período de incubação, número de ninfas, duração e sobrevivência da fase ninfal. Efetuouse a contagem de tricomas e a determinação do pH e teor de acilglicose para todos os genótipos. Na presença de exsudato, LA716 proporcionou redução na oviposição do inseto, o que sugere efeito antixenótico. Resistência antixenótica em LA1739 e PI134417 não foi associada ao exsudato glandular. O efeito do exsudato na oviposição do inseto foi explicado pelo teor de acilglicose. O pH apresentou papel secundário na oviposição da mosca-branca. A densidade de tricomas favoreceu o desenvolvimento do inseto. LA1584 destacou-se pela redução na sobrevivência do inseto e...

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Section: Genótipounclassified

Exsudato glandular de genótipos de tomateiro e desenvolvimento de Bemisia tabaci (Genn.) (Sternorryncha: Aleyrodidae) biótipo B

Fancelli¹,

Vendramim²,

Frighetto

et al. 2005

Neotrop. Entomol.

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“…Bemisia tabaci (Gennadius) is reported to prefer to oviposit on the young leaves of several host plants including eggplant (Avidov, 1956), lubia (Dolichos lablab) (Khalifa & E1-Khidir, 1964), and tomato, although on tomato, the age of the plant may influence leaf age preference (Ohnesorge et al, 1980). On cotton, the literature on B. tabaci leaf age preference varies, some studies indicating that young leaves are preferred (Horowitz, 1983), others indicating older leaves are preferred (Berlinger et al, 1983), and others showing mixed results (Husain & Trehan, 1933). Trialeurodes rara Singh (= T. lubia EI-Khidir & Khalifa) prefers young lubia leaves over older leaves for oviposition (Khalifa & E1-Khidir, 1964).…”

Section: Discussionmentioning

confidence: 99%

“…P. myricae appears to discriminate among leaf ages based on qualities of the leaf cuticle, whereas T. vaporariorum uses cues from the interior of the leaf to discriminate among leaf ages. B. tabaci may also use cues from the interior of the leaf to discriminate among cotton leaf ages; in this case, the cue may be the pH of the cell sap (Berlinger et al, 1983).…”

Section: H~ ~I~ H~ ~ ~I~v -H -I-i -Ki -H -Kl ~Kl -Kl +1 § -Kl -K~ mentioning

confidence: 99%

Leaf age preference for opposition by three species of whitefly on lemon

Walker

Zareh

1990

Entomologia Exp Applicata

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The leaf age preferences for oviposition by three species of whitefly (Dialeurodes citri [Ashmead], Aleurothrixusfloccosus [Maskell], and Parabemisia myricae [Kuwana]) were tested on lemon, Citrus limon (L.). Four categories of leaf age were tested (I: incompletely expanded, growing leaves; II: young leaves that are completely expanded but not yet dark green; III: completely mature leaves [dark green]; IV: completely mature leaves judged to be older than III as determined by the age of the twigs to which they were attached). Paired choice experiments were conducted in the laboratory using excised leaves and in the field using intact leaves. In both laboratory and field tests, P. myricae preferred I over all other leaf ages. It rarely oviposited on II and never oviposited on III or IV, even when they were the only two choices. The order of preference for D. citri in laboratory and field tests was II > I > I I I > IV. In laboratory tests, A. floccosus exhibited the same order of preferences as D. citri, but in the field, II was preferred over all others, III was slightly preferred over IV, and I varied greatly among replicates in comparisons against III or IV. In related experiments, the choice between I & I I I by A. floccosus and D. citri was not affected by confining the whiteflies to either I or III for three days prior to testing.

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“…This may be due, in part, to the high leaf pH in this genotype (Table 2), but not exclusively to this factor. According to Berlinger et al (1983), leaf pH affects host plant selection by B. tabaci, which prefers cotton leaves with pH above 6. Despite the oviposition preference, LA1609 interfered negatively on the egg and nymphal survival (Tables 1 and 2), indicating that antibiosis occurs.…”

Section: Resultsmentioning

confidence: 99%

Development of Bemisia tabaci (Gennadius,1889) biotype B on Lycopersicon spp. genotypes

Fancelli

Vendramim

2002

Sci. agric. (Piracicaba, Braz.)

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Whiteflies are phytophagous insects, whose nymphs and adults suck the phloem sap, causing direct damage due to host plant weakness. In tomato (Lycopersicon spp.) crops, they are important vectors of limiting fitoviruses. The objective of this study was to determine the effects of Lycopersicon spp. genotypes on Bemisia tabaci (Gennadius, 1889) biotype B development under greenhouse conditions. The evaluated genotypes were LA462 (and Santa Clara (L. esculentum). LA716 was non-preferred for oviposition by the whitefly, which suggests an antixenotic effect. LA1584 showed an antibiotic resistance because nymphal survival was reduced and nymphal developmental time was increased. Antixenotic resistance was observed in LA1739 and PI134417, based on a reduction of oviposition. PI134417 also reduced nymphal survival, which suggests an antibiotic effect, but LA1739 was suitable for insect development. LA1609 was highly preferred for oviposition, however it reduced insect survival. P25 and Santa Clara (L. esculentum) were highly preferred for oviposition.

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The importance of pH in food selection by the tobacco whitefly,Bemisia tabaci

Cited by 32 publications

References 5 publications

Exsudato glandular de genótipos de tomateiro e desenvolvimento de Bemisia tabaci (Genn.) (Sternorryncha: Aleyrodidae) biótipo B

Exsudato glandular de genótipos de tomateiro e desenvolvimento de Bemisia tabaci (Genn.) (Sternorryncha: Aleyrodidae) biótipo B

Leaf age preference for opposition by three species of whitefly on lemon

Development of Bemisia tabaci (Gennadius,1889) biotype B on Lycopersicon spp. genotypes

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