Population variability of Bemisia tabaci (Genn.) in different hosts

The silverleaf whitefly (SLW), Bemisia tabaci biotype B, is considered one of the most serious pests in cotton worldwide. Its control is based on the use of pesticides, which are well-known for their harmful effects on nontarget organisms and the environment. Here, we examined resistance of several cotton genotypes in terms of antixenosis and antibiosis against SLW. We also investigated the mechanisms of cotton genotypes involved in antixenosis against SLW by correlating with leaf trichome density and leaf colour parameters. In choice tests, we selected resistant cotton genotypes, Gossypium hirsutum palmeri, Aubum 56-7, G. hirsutum morrilli, Moc o, Nu-16 (B2 B3 B6)-78/658, Paymaster 53-816 and 'IAC 23', based on SLW oviposition and host preference. No-choice tests with these genotypes confirmed antixenosis effect on SLW; however, no antibiosis resistance was detected in terms of developmental period and adult emergence rate. We found SLW oviposition preference was positively correlated with trichome density in the abaxial leaf surface, while adult host preference was mostly explained by high levels of green intensity of adaxial surface. Nevertheless, both SLW oviposition and host preference were negatively correlated with the lightness level of adaxial leaf surface. Probably, the underlying mechanism of cotton resistance is based on more than just these two parameters, but our study will contribute to selecting resistant cotton genotypes and helps to understand the mechanisms involved in cotton resistance against SLW. To our best knowledge, this is the first work showing that cotton leaf colour parameters are related to resistance against SLW.

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“…Recently, the identity of this whitefly strain used in this study was confirmed by molecular analysis (Valle et al. ).…”

Section: Methodssupporting

confidence: 60%

Resistance of cotton genotypes with different leaf colour and trichome density to Bemisia tabaci biotype B

Prado

Peñaflor

Cia

et al. 2015

J Applied Entomology

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“…In relation to eggs viability results, JAB07 isolate also was the most virulent, with a LC of 0.012 × 10 3 conidia/ml ( Table 2). The best results aiming the B. tabaci Biotype B control ar related with B. bassiana isolates, with mortality rates above 70% [16,2]. Several studies confirm the potential of B. bassiana for the control of tabaci Biotype B, that represented by the greater amount of products formulated worldwide for this pest [22,26].…”

Section: Resultsmentioning

confidence: 86%

“…After complete drying, the leaflets were transferred individually to glass containers (10 ml) and the petioles immersed in agar-water solution (1.5%) to maintain leaf turgidity [16]. A control treatment was performed by immersing the bean leaflets in solution containing 10 ml of autoclaved water + Tween® 20 (0.05%).…”

Section: Pathogenicity Bioassays With B Tabaci Nymphsmentioning

confidence: 99%

Potential of Entomopathogenic Fungi as Biological Control Agents of Whitefly (Bemisia tabaci biotype B) (Genn.) (Hemiptera: Aleyrodidae)

Espinosa

Silva

Duarte

et al. 2019

JEAI

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The efficiency of isolates from entomopathogenic fungus Beauveria bassiana, Lecanicillium muscarium and Metarhizium rileyi in the control of eggs and third-instar nymphs of whitefly, Bemisia tabaci biotype B, was evaluated by pathogenicity and virulence tests, under laboratory conditions. For the pathogenicity tests, five leaflets of bean (Phaseolus vulgaris) plants containing 20 nymphs or 20 eggs of B. tabaci biotype B were used. The leaflets were immersed in suspension containing a concentration of 108 conidia/ml of each fungus isolate. Nymph mortality and egg viability were evaluated after seven days. The isolates that caused nymph mortality and egg viability above 80% were submitted to virulence tests, in order to estimate the lethal concentration (LC50) of each isolate. All isolates were pathogenic to eggs and third-instar nymphs of B. tabaci Biotype B. JAB07 of B. bassiana and LCMAP3790 of L. muscarium isolates presented the best results, with nymphs mortality of 96.68 ± 2.25% and 97.74 ± 1.56%, respectively. Additionally, JAB07 was the most virulent isolate, both for eggs and third-instar nymphs, with LC50 estimated of 0.012 and 0.006 × 103 conidia/ml, respectively. We suggest, future field trials are required in order to analyze the real efficiency of this isolate in the control of eggs and nymphs of B. tabaci biotype B in field conditions.

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“…Manteiga) in plastic pots containing soil mix composed of shredded pine bark, peat, and expanded vermiculite at 60% wt/wt moisture content (Tropstrato HT; Vida Verde, Mogi Mirim, SP, Brazil, http://www.vidaverde.agr.br/prod utos.htm). The identity of the whitefly colony was previously characterized as biotype B (Fontes et al, 2010(Fontes et al, , 2012Valle et al, 2013).…”

Section: Biological Material: Whiteflies Virus Isolates and Plantsmentioning

confidence: 99%

Settling preferences of the whitefly vector Bemisia tabaci on infected plants varies with virus family and transmission mode

Maluta¹,

Fereres

Lopes³

2017

Entomologia Exp Applicata

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Virus infection may change not only the host‐plant phenotypic (morphological and physiological) characteristics, but can also modify the behavior of their insect vector in a mutualistic or rather antagonistic manner, to promote their spread to new hosts. Viruses differ in their modes of transmission and depend on vector behavior for successful spread. Here, we investigated the effects of the semi‐persistently transmitted Tomato chlorosis virus (ToCV, Crinivirus) and the persistent circulative Tomato severe rugose virus (ToSRV, Begomovirus) on alighting preferences and arrestment behavior of their whitefly vector Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) Middle East Asia Minor 1 (MEAM1) on tomato plants (Solanum lycopersicum L. cv. Santa Clara, Solanaceae). The vector alighting preferences between infected and uninfected plants in choice assays were apparently influenced by the presence of ToCV and ToSRV in the whiteflies or by their previous exposure to infected plants. The observed changes in vector behavior do not seem to benefit the spread of ToCV: non‐viruliferous insects clearly preferred mock‐inoculated plants, whereas ToCV‐viruliferous insects landed on mock‐inoculated and ToCV‐infected plants, indicating a partial change in insect behavior – ToCV was able to directly affect the preference of its vector B. tabaci, but this change in insect behavior did not affect the virus spread because viruliferous insects landed on mock‐inoculated and infected plants indistinctly. In contrast, ToSRV‐viruliferous insects preferred to land on mock‐inoculated plants, a behavior that increases the probability of spread to new host plants. In the arresting behavior assay, the majority of the insects remained on mock‐inoculated plants when released on them. A greater number of insects moved toward mock‐inoculated plants when initially released on ToCV‐ or ToSRV‐infected plants, suggesting that these viruses may repel or reduce the nutritional quality of the host plants for B. tabaci MEAM1.

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Population variability of Bemisia tabaci (Genn.) in different hosts

Cited by 7 publications

References 30 publications

Resistance of cotton genotypes with different leaf colour and trichome density to Bemisia tabaci biotype B

Resistance of cotton genotypes with different leaf colour and trichome density to Bemisia tabaci biotype B

Potential of Entomopathogenic Fungi as Biological Control Agents of Whitefly (Bemisia tabaci biotype B) (Genn.) (Hemiptera: Aleyrodidae)

Settling preferences of the whitefly vector Bemisia tabaci on infected plants varies with virus family and transmission mode

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