Larval body colour polymorphism in <i>Helicoverpa armigera</i> (hubner) populations across India

Chakravarty, S. C.; Padwal, Kanchan G.; Srivastava, C. P.

doi:10.5958/0974-8172.2020.00093.0

Cited by 4 publications

(5 citation statements)

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“…This must have some degree of influence on the relative fitness of this insect that is reflected in its phenotype. But in case of the present study, all the other variables (environment and diet) were kept constant, so, the phenotypic variability due to the existence of genetic differences amongst the populations cannot be ruled out, as also hinted by Chakravarty et al (2020). Similarly, Canal et al (2018) observed significant morphological variability in geographically isolated Colombian populations of the fruit fly, Anastrepha fraterculus (Wiedemann) reared under the same laboratory conditions, and thus also concluded about possible involvement of genetic factors in the expression of such differences.…”

Section: Discussionmentioning

confidence: 86%

Phenotypic variability in the Old World bollworm, Helicoverpa armigera (Hübner) populations in India

2021

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Helicoverpa armigera (Hübner) is one of the most prominent polyphagous species of the Heliothinae pest complex that inflicts severe damage to a wide range of crops in India. Knowledge regarding the population structure of the pest species, whether morphological or genetic, is considered as an essential tool in making effective management decisions. Thus here, we performed the phenotypic characterization of H. armigera populations collected from varied geographic locations across India. Studied populations differed significantly for several external morphometric traits studied at larval, pupal and adult stages. Significant differences were also observed with respect to the intensity of black pigmentation on larval body as well as adult eye and forewing colour patterns. Besides external phenotypic traits, the length of genital organs like aedeagus and valva in males, and bursa copulatrix and bursa seminalis in females also differed significantly amongst populations. The dendrogram based on selected traits showed clear cut differentiation of studied populations into two major groups, one including all the South Zone populations and the other having populations from North and Central Zones. Differences based on phenotyping in the present study indicate the possibility of the existence of different subspecies within the Indian populations of H. armigera.

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Section: Discussionmentioning

confidence: 86%

Phenotypic variability in the Old World bollworm, Helicoverpa armigera (Hübner) populations in India

2021

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“…Our study has confirmed that H. armigera can successfully adapt to the colour of its host plant. The colour polymorphism of the larvae of this species is a known fact, the triggers and causes of which are reported in detail in Yamasaki et al (2009) and Chakravarty et al (2020). Based on the results of their laboratory studies, they point out that the colour of the larvae is related to the colour composition of the host plant currently consumed, which is mainly a function of the incorporation of carotenoid content of the plant (Ramos and Morallo-Rejesus, 1976), As a diurnal herbivore, its adaptation of H. armigera to its environment's colour is crucial for its survival.…”

Section: Discussionmentioning

confidence: 99%

“…Their results suggested that the colouration of the larvae was mainly determined by the part of the plant on which the larvae were reared. Chakravarty et al (2020) analysed the larval colours of H. armigera populations originating from different locations and showed that the dominant colours differed significantly in their place of origin. It is hypothesised that diet-induced body colour polymorphism in H. armigera may play a role in larvae avoiding visual predation (Yamasaki et al, 2009).…”

Section: Open Accessmentioning

confidence: 99%

Colour polymorphism of cotton bollworm larvae as a function of the type of host plant providing its development

Keszthelyi,

Orsi-Gibicsár,

Pál-Fám

et al. 2024

Front. Ecol. Evol.

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A well-known insect phenomenon is colour polymorphism, from which the species hopes to gain some ecological advantage. Herbivores adapt to the colours of their environment to reduce their chances of becoming prey, while predators use camouflage colours to succeed in hiding from prey. The larvae of the cosmopolitan, highly invasive cotton bollworm (Helicoverpa armigera Hbn., Lep.: Noctuidae) also benefit from this morphological polymorphism. Their fully-developed larvae can take on various colours when feeding on foliage. Our study aimed to determine the host plant-related colour adaptation of H. armigera larvae collected from different plant organs using different spectral analysis methods. Our studies, based on colour analysis of photographic images, showed that the colour of fully-developed larvae of the species is highly correlated with the colour of the damaged nutrient plant. The dominant colours of the larvae show a high similarity with the colours of the consumed host plant parts. The RGB-based analysis confirmed that larval colours are clustered according to the host plant’s organs and are mainly located in the yellow and green regions of the visible light spectrum. All these results confirm the extraordinary adaptive capabilities of this invasive species, which, among other things, verify its worldwide distribution.

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“…The laboratory conditions for conducting this experiment were 19±2°C and 70-80% RH. The data were analysed statistically with one-way ANOVA using SPSS software packages following Chakravarty et al (2020). Duncan's Multiple Range Test (DMRT) was used to determine statistical differences (p=0.01).…”

Section: Methodsmentioning

confidence: 99%

Efficacy os Some Plant Extracts against Termites Under Controlled Conditions

Padwal,

Chakravarty,

Srivastava

2023

IJE

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Termites, particularly Odontotermes spp., are a severe pests of several crops in India. The usage of environmental friendly chemicals for termite management has been on the rise worldwide. This study examined the effects of various fresh and fermented plant extracts, viz. sweet neem (leaf), marigold (flower), tulsi (leaf), common lantana (leaf), neem (leaf), congress grass (leaf), and jatropha (seeds) at four distinct concentrations (5, 10, 15, and 17.5% w/v) on worker caste of Odontotermes sp. After 48 hr of exposure, the fresh extracts (5%) of neem and congress grass resulted in the highest mortality (93.30% and 90%, respectively), while the fermented extracts (5%) of neem and tulsi achieved 100% death at 12 hr only. They were at par with the standard check (imidacloprid 17.8 SL). Thus, neem, tulsi, and congress grass based extracts could be incorporated as effective botanicals into an integrated termite management program.

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Larval body colour polymorphism in Helicoverpa armigera (hubner) populations across India

Cited by 4 publications

References 0 publications

Phenotypic variability in the Old World bollworm, Helicoverpa armigera (Hübner) populations in India

Phenotypic variability in the Old World bollworm, Helicoverpa armigera (Hübner) populations in India

Colour polymorphism of cotton bollworm larvae as a function of the type of host plant providing its development

Efficacy os Some Plant Extracts against Termites Under Controlled Conditions

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