Population dynamics of teak defoliator, Hyblaea puera Cram. (Lep., Hyblaeidae) in teak plantations of Bangladesh, Journal of Applied Entomology, Volume Abstract. Hyblaea puera Cramer (Lepidoptera: Hyblaeidae) was reported in commercial teak (Tectona grandis L. f.) plantations in the states of Campeche and. Hyblaea puera Cramer (Lepidoptera: Hyblaeidae) was reported in commercial teak (Tectona grandis L. f.) plantations in the states of.
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We were therefore interested in investigating the temporal and spatial relationship among various population groups in Nilambur, Kerala India and address the cause of outbreak at the landscape level. DNA extraction was performed with a minor modification of isolation and purification protocol as described earlier [ 37 ] being extracted from whole larvae and quantified spectrophotometrically using a spectrophotometer at nm Shimadzu. It has been estimated that in the Nilambur teak plantation during the study period, protected trees increased by an annual increment of 6.
Ecological Entomology 37, The populations were classified into ‘endemic’, ‘epicenter’ and ‘epidemic’ populations based on the time of occurrence and size of infestation.
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The species has also been recently reported to be present in Central America and Africa. The attack can kill smaller seedlings but usually only hyvlaea the growth increment.
Defoliation does not kill the trees, but does lead to huge timber loss. The full-grown larva measures about 3.
Only phera showing clear and reproducible patterns were included in the final analysis and these were scored. Evidence gathered from the past decade on the population dynamics of H.
The discovery of virus disease on H. Frequent assimilation of mitochondrial DNA by grasshopper nuclear genomes. The teak defoliator, Hyblaea puera: Genetic differentiation between and within strains of the saw-toothed grain beetle, Oryzaephilus surinamensis Coleoptera: With the Teak defoliator, earlier studies based on temporal and spatial distribution of the larvae indicated that the epicenters were not constant over the years and did not represent highly favourable local environments [ 3 ].
Hyblaea puera – Wikipedia
The present results appear to validate the hypothesis, that control of H. Eur J of Entomology.
On the other hand, the findings do suggest the alternate hypothesis, i. This serves as an essential, readily accessible source of protein for the villagers, commonly farmers, around these hyblaeaa. Open in a separate window. The larval samples that were geographically close and had a difference of one complete life cycle stage between the population groups were subjected to molecular studies to evaluate their relatedness.
About eggs are laid per female with a recorded maximum of hublaea One of these clusters comprised the majority of the endemic samples with a few samples from epicenter insects, whilst the other cluster was comparatively larger and had the two major sub clusters.
A synnematous fungus of the genus Hirsutella is found to be pathogenic to this pest. Therefore, appropriate strategies should be adopted to control the epicenter populations, which occurs in a smaller area.
The temporal relationship between the endemic population and the epicenter populations and that of the epicenter hynlaea with the large-scale epidemics were first worked out.
Retrieved 8 August Later the viral DNA takes over control of the cellular machinery to reproduce itself. While evaluating the genetic structure in introduced population of the fire ant, Solenopsis invicta Buren using different classes of markers, it was confirmed that both mitochondrial and nuclear markers display the same hierarchical structure [ 28 pjera.
University of Technology, Sydney. M depicts variability in Lepidopteran species. Every year high-intensity outbreaks of teak defoliator occur immediately after the premonsoon showers in late February or early march in Kerala. Patterns of mitochondrial versus nuclear DNA sequence divergence among nymphalid butterflies: Hugh D Loxdale for his valuable suggestions on the manuscript of this paper.
Support Center Support Center. The NPV which enters the insect gut, lyses in the alkaline environment of the midgut, releasing virions. The maximum number of bands was detected using primer cytC-B-3′, while the maximum number of monomorphic bands were detected using primer EFS Author information Article notes Copyright and License information Disclaimer.
If progenies of the epicenter populations cause the larger epidemics, control of these could prevent major outbreaks. A rapid spread of infection in the insect body leads immediately to cessation of feeding and later on, to death.
The main parasitoids attacking teak defoliator include the tachinid Palexorisa solennisa eulophid Sympiesis hyblaeaethe chalicid Brachymeria lasus and hyboaea three ichneumonidsEriborus gardneriStictopisthus sp. Randomness of genome amplification methods have been efficiently used in constructing the phylogenetic history in the weevil, Aubeonymus mariafranciscae Roudierwhich had diverged recently [ 5 ], whilst the origin of the Argentine stem weevil, Listronotus bonariensis Kuschel in New Zealand, was traced to the eastern coast of South America [ 30 ].
Endemics are insects belonging to the low-density population level; epicenters are patchy, medium density outbreaks that occur during the pre-monsoon season, whilst epidemic represents large area, high-density outbreak populations.
DNA isolation DNA extraction was performed with a minor modification of isolation and purification hybalea as gyblaea earlier [ 37 ] being extracted from whole larvae and quantified spectrophotometrically using a spectrophotometer at nm Shimadzu.
While studying the differentiation process of grain aphid, Sitobion avenae F. Analysis The polymorphic content for nuclear and mitochondrial primers were analyzed using Bionumerics software [ 38 ].
Similarly the epidemic samples were also collected from insects representing the same life stages at the time of collection from each aggressive patch. Landscape of Nilambur teak plantation showing distribution of the endemic, epicenter and epidemic populations of Hyblaea puera.
It is probably an adaptive trait acquired by the species for surviving in the hostile mangrove environment, since the pupation is not possible in the muddy and inundated soils of mangroves.
Distinct hjblaea and nuclear Puerra sequence divergence patterns for phylogenetic inference has been established among nymphalid butterflies [ 29 ].