Growth and Development of the Biological Control AgentBagous hydrillaeas Influenced by Hydrilla (Hydrilla verticillata) Stem Quality

Wheeler, G.

doi:10.1006/bcon.1996.0484

Cited by 25 publications

(13 citation statements)

References 33 publications

(32 reference statements)

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“…Although we did not measure leaf characteristics (physical and chemical features), we hypothesised that the heavier pupal mass for SAB females might be a direct response to host plant characteristics (Wheeler & Center, 1997;Diaz et al, 2011)as insect preference and performance can be driven by plant traits which are occasionally difficult to disentangle (Jermy, 1984;Bernays & Chapman, 1994;Clissold et al, 2006;Hull-Sanders et al, 2007) because of the multiplicity of indirect biotic and abiotic effects that may explain a correlation (Hunter & Price, 1998). Although we did not measure leaf characteristics (physical and chemical features), we hypothesised that the heavier pupal mass for SAB females might be a direct response to host plant characteristics (Wheeler & Center, 1997;Diaz et al, 2011)as insect preference and performance can be driven by plant traits which are occasionally difficult to disentangle (Jermy, 1984;Bernays & Chapman, 1994;Clissold et al, 2006;Hull-Sanders et al, 2007) because of the multiplicity of indirect biotic and abiotic effects that may explain a correlation (Hunter & Price, 1998).…”

Section: Discussionmentioning

confidence: 99%

Variation in host plant has no effect on the performance and fitness‐related traits of the specialist herbivore Pareuchaetes insulata

Uyi

Hill

Zachariades

2014

Entomologia Exp Applicata

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The effect of host plant dissimilarity on insect preference and performance was tested using two morphological forms of Chromolaena odorata (L.) King & Robinson (Asteraceae) (one from Florida, USA, another from South Africa), and a specialist herbivore, Pareuchaetes insulata (Walker) (Lepidoptera: Erebidae: Arctiinae) from Florida, USA, that was introduced as a biological control agent in South Africa. Although this insect did establish at one site, of some 21 sites at which over 800 000 individuals were released, its population level in the field has remained low after an initial outbreak in 2006. To explain the poor performance of P. insulata, we hypothesised that P. insulata larvae prefer Floridian C. odorata to the southern African C. odorata, which is morphologically and probably genetically distinct, and that larvae reared on Floridian C. odorata should have higher fitness and performance. We tested this by comparing insect performance metrics on each of the two plant forms in laboratory experiments. Apart from pupal mass, which was significantly greater on southern African C. odorata, P. insulata performance metrics were similar on both plant forms; there were no significant differences in total leaf area consumed, egg and larval development, immature survival rates, feeding index, host suitability index, growth index, and fecundity between the Floridian and southern African C. odorata plants. In sum, we could not demonstrate that differences in plant forms in C. odorata are responsible for the poor performance of P. insulata in South Africa.

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Section: Discussionmentioning

confidence: 99%

Variation in host plant has no effect on the performance and fitness‐related traits of the specialist herbivore Pareuchaetes insulata

Uyi

Hill

Zachariades

2014

Entomologia Exp Applicata

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“…This trend was observed for 30 and 50 g/l sucrose treatments and confirmed by t-test analysis of pooled data of in vitro and ex vitro samples (Table 2). Like foliar N, stem N concentration was also used to assess various traits of the stem such as N sufficiency (Adjctcy and Campbell 1998) and quality (Wheeler and Center 1997).…”

Section: Photosynthetic Pigmentsmentioning

confidence: 99%

Influences of exogenous sucrose on juvenile avocado during in vitro cultivation and subsequent ex vitro acclimatization

Premkumar

Barceló-Muñóz²,

Pliego‐Alfaro

et al. 2002

Trees

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We investigated changes in physiological characteristics of micropropagated juvenile avocado (Persea americana Mill.) cultured in three different sucrose concentrations (5, 30 and 50 g/l) for 4 weeks and subsequently acclimatized to ex vitro conditions. No significant differences in foliar concentrations of total chlorophylls, N mass , flavonoids and total soluble proteins were observed during in vitro growth or after acclimatization. However, ex vitro transfer exerted multiple effects on foliar ratios of chlorophyll a to b, total chlorophylls to carotenoids and stem N and C/N ratio. Both varying sucrose concentrations during in vitro growth and ex vitro transfer, affected the concentration of rubisco subunits independent of other photosynthetic components, viz. total chlorophylls, foliar N and total soluble proteins. These results suggest that preconditioning juvenile avocado microplants at different concentrations of sucrose modify several physiological parameters during ex vitro acclimatization, like concentrations of carotenoids and rubisco, which can improve vigour of plants in autotrophic conditions.

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“…In the U.S.A, the Indian species B. affinis Hustache, 1926 and the Australian species B. hydrillae O'Brien, 1992 were introduced as biological control agents of Hydrilla verticillata (L. f.) Royle (Buckingham 1988;Buckingham & Bennett 1998;O'Brien & Pajni 1989;Wheeler & Center 1997;Center et al 2013), and some Palaearctic species (B. collignensis (Herbst, 1797), B. longitarsis Thomson, 1868) and Oriental species (B. geniculatodes O'Brien, 1995(B. geniculatodes O'Brien, , B. vicinus1992Askevold et al 1994;. From a comprehensive morphological study, especially of the complex structure of the male genitalia, concluded that Bagoini, as then delimited, constituted a monophyletic group composed of about 50 monophyletic species groups.…”

Section: Introductionmentioning

confidence: 99%

A phylogenetic analysis of the aquatic weevil tribe Bagoini (Coleoptera: Curculionidae) based on morphological characters of adults

Caldara

O’Brien²,

Meregalli

2017

Zootaxa

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Relationships of almost all known Bagoini from the world (Holarctic, Afrotropical and Oriental Regions, and Australia) were analyzed using morphological characters. To define relationships with other Curculionidae and among the species within the tribe, 119 characters were used: 64 of these are genital structures, mainly from the males, where the penis and endophallus are endowed with many complex structures that are apparently unique in Curculionidae. In general, the genital characters appear conservative and tend to resolve relationship at more terminal levels of phylogeny. On the contrary, many external characters are strongly homoplastic, probably secondary modifications associated with their aquatic lifestyle, but which tended to resolve relationships among the lower nodes of the tree. On the basis of this analysis, we confirmed the monophyly of the tribe. Our phylogenetic reconstruction suggests a new taxonomic ordering of the tribe in genera and subgenera. The following taxa, previously considered as synonyms of Bagous Germar, 1817, are resurrected as valid taxa: Hydronomus Schoenherr, 1825 and Memptorrhynchus Iablokoff-Khnzorian, 1960 as genera; Parabagous Schilsky, 1907, Hydronoplus Fairmaire, 1898 (= Pseudobagous Sharp, 1917 syn. n.) (stat. n.) and Macropelmus Dejean, 1821 (= Pnigodes LeConte, 1876 syn. n.) (stat. n.) as subgenera. Azollaebagous gen. n. and Hydrillaebagous subgen. n. of Bagous are created. Among some genera, especially Bagous and its subgenera, we recognize a somewhat large number of species groups, distinguishable mainly by unique character states of the male genitalia. Monophyly of most of these appears well supported. Some of these groups are presently monotypic, but we ascertained that many of them have other representatives not yet described.

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Growth and Development of the Biological Control AgentBagous hydrillaeas Influenced by Hydrilla (Hydrilla verticillata) Stem Quality

Cited by 25 publications

References 33 publications

Variation in host plant has no effect on the performance and fitness‐related traits of the specialist herbivore Pareuchaetes insulata

Variation in host plant has no effect on the performance and fitness‐related traits of the specialist herbivore Pareuchaetes insulata

Influences of exogenous sucrose on juvenile avocado during in vitro cultivation and subsequent ex vitro acclimatization

A phylogenetic analysis of the aquatic weevil tribe Bagoini (Coleoptera: Curculionidae) based on morphological characters of adults

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