Ecological studies relevant to the management of<i>Thrips palmi</i>Karny on mango in India

Verghese, Abraham; Tandon, P. L.; Rao, G. S. Prasada

doi:10.1080/09670878809371207

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…In addition to higher LIP values observed in both sexes, the mean ‘aggregation’ size λ values were >2, indicating active aggregation of both male and female, as suggested by Salifu & Hodgson (1987) and Verghese et al. (1988). Our results also reveal that factors such as block, crop growth stage, and location could influence BFT aggregation behaviour.…”

Section: Discussionmentioning

confidence: 99%

“…In this regard, the criteria outlined by Arbous & Kerrick (1951) were used to estimate the mean ‘aggregation’ size λ (Southwood & Henderson, 2000): where λ is the mean number of individuals in the aggregation for the probability level allocated to υ, is the sample mean, k is the dispersion parameter obtained from the negative binomial model, and υ is a function with χ 2 distribution with 2k degrees of freedom. In interpreting λ, we note that λ<2 indicates that aggregation is more due to an environmental effect and not to active behaviour of the insect, whereas λ>2 is an indication that the cause of aggregation is due to either factor, but especially active processes by the thrips (Salifu & Hodgson, 1987; Verghese et al., 1988). Field data collected in Matuu and Mbita were subjected to similar analyses.…”

Section: Methodsmentioning

confidence: 99%

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Active aggregation among sexes in bean flower thrips (Megalurothrips sjostedti) on cowpea (Vigna unguiculata)

Niassy

Ekesi

Maniania

et al. 2015

Entomologia Exp Applicata

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Male sexual aggregations are a common territorial, mating-related or resource-based, behaviour observed in diverse organisms, including insects such as thrips. The influence of factors such as plant substrate, time of day, and geographic location on aggregation of thrips is uncertain, therefore we monitored the dispersion of male and female bean flower thrips (BFT), Megalurothrips sjostedti (Trybom) (Thysanoptera: Thripidae), on cowpea, Vigna unguiculata (L.) Walp. (Fabaceae), over three cowpea growth stages and across three cowpea-growing areas of Kenya. Our results indicated that for all the crop growth stages, the density of BFTs varied over the time of day, with higher densities at 10:00, 13:00, and 16:00 hours than at 07:00 hours. Thrips densities did not differ among blocks at the budding stage, but they did at peak flowering and podding stages. Dispersion indices suggested that both male and female BFTs were aggregated. Active male aggregation occurred only on green plant parts and it varied across blocks, crop stages, and locations. Similarly, active female aggregation was observed in peak flowering and podding stages. Such active aggregation indicates a semiochemical or behaviour-mediated aggregation. Identification of such a semiochemical may offer new opportunities for refining monitoring and management strategies for BFT on cowpea, the most important grain legume in sub-Saharan Africa.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Active aggregation among sexes in bean flower thrips (Megalurothrips sjostedti) on cowpea (Vigna unguiculata)

Niassy

Ekesi

Maniania

et al. 2015

Entomologia Exp Applicata

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“…Nevertheless, for T. palmi in mango (Mangifera indica L.), Verghese et al (1988) found that some of the transformations indeed eliminated the dependence between mean and variance, as well as stabilizing the latter. Among the transformations that did not solve the problem were √X+1 and X…”

Section: Data Transformationmentioning

confidence: 99%

Non-Parametric Statistical Methods and Data Transformations in Agricultural Pest Population Studies

Campos

Bustillo²,

Villafranca³

et al. 2012

Chilean J. Agric. Res.

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Analyzing data from agricultural pest populations regularly detects that they do not fulfill the theoretical requirements to implement classical ANOVA. Box-Cox transformations and nonparametric statistical methods are commonly used as alternatives to solve this problem. In this paper, we describe the results of applying these techniques to data from Thrips palmi Karny sampled in potato (Solanum tuberosum L.) plantations. The χ 2 test was used for the goodness-of-fit of negative binomial distribution and as a test of independence to investigate the relationship between plant strata and insect stages. Seven data transformations were also applied to meet the requirements of classical ANOVA, which failed to eliminate the relationship between mean and variance. Given this negative result, comparisons between insect population densities were made using the nonparametric Kruskal-Wallis ANOVA test. Results from this analysis allowed selecting the insect larval stage and plant middle stratum as keys to design pest sampling plans.

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“…But, the grower reported severe lesions on fruits in 2008, which led to discard of many of the fruits from organic mango export. Mango inflorescence is known to be attacked by Thrips palmi (Verghese et al, 1988). Also, Megalurothrips distalis (Karny), Thrips hawaiiensis and Haplothrips tenuipennis Bagnall have been recorded from Andhra Pradesh (Ramasubbarao and Thammiraju, 1994;Kannan and Rao, 2006a, b).…”

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confidence: 99%

Record of Thrips on Mango

Krishnamoorthy,

Ganga Visalakshi

2012

J. Hortic. Sci.

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During a trial in 2009 at Moorapoor Village, Dharmapuri district, Tamil Nadu, for control of mango hoppers and thrips using entomo-pathogens, inflorescences were seen to harbour different species of thrips. Close microscopic observation revealed presence of Frankliniella schultzei (Tryb.), Thrips palmi Karny, T. hawaiiensis (Morgan) and T. subnudula. However, Thrips palmi was the predominant species whereas, for the first time Frankliniella schultzai and Thrips subnudula (Karny, 1927) are reported here on inflorescence of mango in India.

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Ecological studies relevant to the management ofThrips palmiKarny on mango in India

Cited by 11 publications

References 10 publications

Active aggregation among sexes in bean flower thrips (Megalurothrips sjostedti) on cowpea (Vigna unguiculata)

Active aggregation among sexes in bean flower thrips (Megalurothrips sjostedti) on cowpea (Vigna unguiculata)

Non-Parametric Statistical Methods and Data Transformations in Agricultural Pest Population Studies

Record of Thrips on Mango

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