Spatial Distribution of Scale Insects: Comparative Study Using Taylor's Power Law

Nestel, David; Cohen, Hadass; Saphir, Nitza; Klein, Michal; Mendel, Zvi

doi:10.1093/ee/24.3.506

Cited by 45 publications

(32 citation statements)

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“…Among arthropods, ants have also been reported to disperse some mealybug species (Gullan and Kosztarab 1997;Malsch et al 2001;Ranjan 2006). Nevertheless, if conditions are favorable, crawlers usually settle on the natal host plant, often close to their mother, which leads to an aggregative distribution (Gullan and Kosztarab 1997;Nestel et al 1995).…”

Section: Dispersalmentioning

confidence: 99%

“…maritimus (Geiger and Daane 2001), or the sugarcane mealybug, S. sacchari (Allsopp 1991;Debarro 1991). However, the cryptic occurrences of mealybugs as well as their typical clumped spatial distribution (Allsopp 1991;Martinez-Ferrer et al 2006;Nestel et al 1995) make monitoring laborious and often impracticable. Population estimates based on the level of male capture in pheromone-baited traps is considered more convenient (Millar et al 2005a).…”

Section: Pheromone Traps and Monitoringmentioning

confidence: 99%

See 1 more Smart Citation

Novel Approaches for the Management of Mealybug Pests

Franco¹,

Zada

Mendel

2009

Biorational Control of Arthropod Pests

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138

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Section: Dispersalmentioning

confidence: 99%

Section: Pheromone Traps and Monitoringmentioning

confidence: 99%

Novel Approaches for the Management of Mealybug Pests

Franco¹,

Zada

Mendel

2009

Biorational Control of Arthropod Pests

Self Cite

138

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“…Moreover, the fact that density did not have any effect on the total dispersal rate might suggest that the crowding in the high density treatment was insufficient to induce enough competition. Judging what constitutes biologically meaningful levels of density however is difficult (Ross et al 2010), as estimates of natural density levels are rare (but see Nestel et al 1995). Other studies considering dispersal behaviour of scale insects crawlers have shown a range of factors influencing dispersal.…”

Section: A B Discussionmentioning

confidence: 99%

“…Usually crawlers are expected to settle close to where they were born (Beardsley and Gonzalez 1975, Nestel et al 1995, Gullan and Kosztarab 1997, possibly because dispersal is risky. However, presumably local conditions will influence dispersal behaviour under some circumstances (Hamilton andMay 1977, Comins et al 1980).…”

Section: Introductionmentioning

confidence: 99%

Sex-specific dispersal behaviour of crawlers in the mealybug Planococcus citri

Ross

Pen

Shuker³

2017

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Sex-specific dispersal can have important evolutionary and ecological implications, influencing local population structure and sex ratio, as well as the speed at which new habitats can be colonized. In scale insects, first-instar nymphs (crawlers) are assumed to be the main dispersal stage. Although all scale insects are extremely sexually dimorphic, in most species the sexes are indistinguishable as crawlers. Here we consider the mealybug Planococcus citri (Risso), and dispersal by crawlers to or from resource patches. The aim of this study was to test if: (1) crawler dispersal behaviour differs between the sexes and how this is affected by local conditions (population density and sex ratio); and (2) there is a difference between the sexes in crawler dispersal success to a new host plant. Using two experiments, which differed in how resources were spread between dispersal sources and sinks, we show that male and female nymphs do not differ in their dispersal behaviour or in their dispersal success when dispersal is via crawler locomotion. These laboratory experiments are an important starting point for understanding the evolution of dispersal behaviour of P. citri in the field, suggesting that more attention might need to be paid to different methods of dispersal as well as crawler locomotion.

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“…A random distribution would show the Poison value of b = 1; a more uniform distribution would have b < 1 while aggregation would show up in values of b > 1. This method was previously used to compare aggregation in other scale populations in Israel (Nestel, Cohen, Saphir, Klein, & Mendel, 1995). The following logarithmic form was used for the analysis:…”

Section: Taylor's Regression To Study Aggregationmentioning

confidence: 99%

Dynamics of the Scale and Its Natural Enemies in a Citrus Grove at Ceiba, Cuba

Awerbuch-Friedlander¹,

González²,

Hernández³

et al. 2013

JAS

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Aim: Research was conducted to study the population dynamics of a citrus scale, and its parasites in "Empresa de Citricos de Ceiba", Havana Province, Cuba. Orange trees, Glover's scale Lepidosaphes gloverii (coccidae, homoptera), and four of its natural enemies including three fungi and a parasitic wasp, were studied in their distributions in space and time, and their interactions, in order to understand why this scale is not a serious pest in Cuba. Methodology: The study consists of observations made bi-weekly on the site during an entire year. Various statistical analyses including Taylor regression and new probabilistic methods that were developed for this study were used to explore the mechanisms of natural regulation of the pest. Major findings: The results of the analysis showed that the scale population was kept in check by seasonally varying recruitment and by mortality that was density dependent through gradual parasitization by several species with distinct spatial preferences and some overlapping. The findings also showed that the first natural enemy to settle on the scale did so independently of the number of scales on the leaf; but ones this happens there was contagion within the scales on the leaf. Conclusion: The study demonstrates that the pest can be regulated within an ecological context of community dynamics. A general theoretical result based on loop analysis demonstrates that using pesticides to control agricultural pests where they co-exist with their natural enemies would actually have counterproductive results, in fact increasing the pest.

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Spatial Distribution of Scale Insects: Comparative Study Using Taylor's Power Law

Cited by 45 publications

References 0 publications

Novel Approaches for the Management of Mealybug Pests

Novel Approaches for the Management of Mealybug Pests

Sex-specific dispersal behaviour of crawlers in the mealybug Planococcus citri

Dynamics of the Scale and Its Natural Enemies in a Citrus Grove at Ceiba, Cuba

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