oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Host plant effect on the activity of digestive enzymes of the gypsy moth caterpillars  [PDF]
Milanovi? Slobodan,Lazarevi? Jelica,Mrdakovi? Marija,Vlahovi? Milena
Glasnik ?umarskog Fakulteta , 2008, DOI: 10.2298/gsf0898127m
Abstract: Insect growth and development depend on nutritive value and secondary metabolite content of their host plants. This influence may be exerted through changing the activity of digestive enzymes which further affects efficiency of conversion of ingested food. This paper represents the results of investigation of feeding effects on the leaves of three oak species (Quercus cerris, Q. robur and Q. petraea) on growth, development and digestive enzyme activities of the 4th instar gypsy moth larvae (Lymantria dispar L.). Compared to larvae fed on Q. cerris and Q. robur leaves, larvae fed on Q. petrea exhibited the lowest body mass, midgut protein content and specific protease activity. Specific amylase activity was significantly reduced in the midguts of larvae fed on Q. robur while host plant did not affect larval duration upon molting into the 4th instar. Concomitant chemical analyses of leaves given to the 2nd and 4th instar larvae was carried out in order to explain the obtained results.
Transcriptome of the Lymantria dispar (Gypsy Moth) Larval Midgut in Response to Infection by Bacillus thuringiensis  [PDF]
Michael E. Sparks, Michael B. Blackburn, Daniel Kuhar, Dawn E. Gundersen-Rindal
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061190
Abstract: Transcriptomic profiles of the serious lepidopteran insect pest Lymantria dispar (gypsy moth) were characterized in the larval midgut in response to infection by Bacillus thuringiensis kurstaki, a biopesticide commonly used for its control. RNA-Seq approaches were used to define a set of 49,613 assembled transcript sequences, of which 838, 1,248 and 3,305 were respectively partitioned into high-, mid- and low-quality tiers on the basis of homology information. Digital gene expression profiles suggested genes differentially expressed at 24 hours post infection, and qRT-PCR analyses were performed for verification. The differentially expressed genes primarily associated with digestive function, including α-amylase, lipase and carboxypeptidase; immune response, including C-type lectin 4; developmental genes such as arylphorin; as well as a variety of binding proteins: cellular retinoic acid binding protein (lipid-binding), insulin-related peptide binding protein (protein-binding) and ovary C/EBPg transcription factor (nucleic acid-binding). This is the first study conducted to specifically investigate gypsy moth response to a bacterial infection challenge using large-scale sequencing technologies, and the results highlight important genes that could be involved in biopesticide resistance development or could serve as targets for biologically-based control mechanisms of this insect pest.
The Analysis of Favourable Mass Multiplication Conditions of Defoliator Lymantria Dispar in Beech Forests from Romania
TOMESCU Romica,C-tin NE?OIU,I. T?UT
Proenvironment Promediu , 2010,
Abstract: In Romania, Lymantria dispar is a defoliator with a high injury potential that produces strong and frequentgradations in Querqus forests in mixture with beech. The research concerning Lymantria dispar infestation was carriedout by in brushes from Herculane Baths County, with gradations of the defoliator in numerical growth and eruptionphases. The statistical data were processed by using the Discriminative Analysis. It has put into evidence the influenceof stationed and brushes properties on the appearance and development of gradations. Strong infestations dominatebrushes with a reduced consistency (0.4 – 0.7) and included in larger age classes. In eruption phase, one evidences theextension tendency on the altitude of infestations (advancing towards the versant, strongly inclined) and in brushes witha larger participation of beech, situated in different age classes and middle-superior production classes, with a morevigorous vegetation stage.
Parasitoid Complex and New Host Plants of the Gypsy Moth, Lymantria dispar L. in the Lakes District, Turkey
Mustafa Avci
Journal of Animal and Veterinary Advances , 2012,
Abstract: The present study determined egg, larval and pupal parasitoids of the gypsy moth Lymantria dispar L. (Lepidoptera: Lymantriidae), which is an important forest pest in Turkey. High populations of the gypsy moth have been observed recently in oak forests and coniferous forests in the Lakes District of Turkey. Pinus brutia Ten and Cedrus libani A. Rich are reported for the 1st time in the world as host plants of L. dispar. Its parasitoid complex and impact were analyzed in a 2-years study. In larval and pupal stages of the pest, the tachinids Exorista segregata (Rond.), Compsilura concinnata Meigen, Drino inconspicua Meigen and Pales pavida Meigen, the chalcid Brachymeria intermedia (Nees), the torymid Monodontomerus aereus Walk. The braconid Apanteles xanthostigma (Haliday) and the egg parasitoids Ooencrytus kuvanae (Howard) (Hym. Encyrtidae), Anastatus disparis Rusch and Anastatus bifasciatus (Fonsc.) (Hym: Eupelmidae) were recorded. O. kuvanae had the greatest impact on L. dispar populations. A. xanthostigma is a new record for Turkey and also a new record for the world as a parasitoid of L. dispar.
Evaluation of the effectiveness of integrated management and mating disruption in controlling gypsy moth Lymantria dispar (Lepidoptera: Lymantriidae) populations.
GOODARZ HAJIZADEH,MOHAMMAD REZA KAVOSI
Nusantara Bioscience , 2012,
Abstract: Hajizadeh G, Kavosi MR. 2012. Evaluation of the effectiveness of integrated management and mating disruption in controlling gypsy moth Lymantria dispar (Lepidoptera: Lymantriidae) populations. Nusantara Bioscience 4: 27-31. This study was conducted during 2008 and 2009 in Daland National Park (north of Iran) to compare the effectiveness of mechanical control used in combination with mating disruption (integrated management) and only mating disruption in controlling gypsy moth, Lymantria dispar (L.) (Lepidoptera: Lymantriidae). Male moths and egg mass counts were taken before (2008) and after (2009) the two treatments were applied. In sites with integrated management and with mating disruption only, 1,828 and 1,793 egg masses/tree, and 412.75 and 207.75 male moths/trap were observed, respectively. Both the numbers of egg masses/tree and of male moths/trap were significantly lower in sites with integrated management than in sites with only mating disruption. This study shows that integrated management was more effective than mating disruption in reducing infestation levels in the study site.
Parasitoid Complex of the Gypsy Moth (Lymantria dispar) in the Increase-phase Populations in Korea
Lee, Jang-Hoon,Robert W. Pemberton
Journal of Ecology and Field Biology , 2009,
Abstract: The species composition of the parasitoid complex and the degree of parasitism by each specieswere analyzed for gypsy moth (Lymantria dispar) populations in the increasing phase. Total of 7,826 mid-lateinstar larvae and pupae were collected and reared from two collection sites in Gangwon Province, Korea. Twotachinid flies (Blepharipa schineri and Parasetigena silvestris), and the ichneumonid wasp (Coccygomimusdisparis) were the most abundant parasitoids, in the order of decreasing importance. Other parasitoids occurringincluded Coteisa melanoscelus, Cotesia scheaferi, Glyptapanteles liparidis, Brachymeria lasus, and Exorista spp.The low incidence of the NPVirus is hypothesized to be an important factor in determining degree of parasitismrate by P. silvestris and B. schineri, and their relative dominance in the parasitoid complex.
Biogenic amines in protocerebral A2 neurosecretory neurons of Lymantria dispar L. (Lepidoptera:Lymantriidae): Response to trophic stress
Peri?-Mataruga Vesna,Mrdakovi? Marija,Vlahovi? Milena,Ilijin Larisa
Archives of Biological Sciences , 2011, DOI: 10.2298/abs1103571p
Abstract: The number, morphometric parameters and amount of aminergic neurosecretory product of protocerebral A2 neurosecretory neurons were investigated in the fifth instar of Lymantria dispar caterpillars, following a suitable or unsuitable trophic regime. Caterpillars originated from two populations (Quercus rubra or Robinia pseudoacacia forest) and were differently adapted to trophic stress, i.e. feeding on locust tree leaves - unsuitable host plant. The number of neurosecretory neurons was higher in the caterpillars originated from Robinia population than in Quercus population, regardless of feeding. A2 neurosecretory neurons, nuclei and their nucleoli were larger in caterpillars fed with unsuitable leaves in both populations. There was more aminergic product in the A2 neurosecretory neurons of the caterpillars fed with unsuitable leaves independently of population origin.
The influence of increased rearing density on medial protocerebral neurosecretory neurons of Lymantria dispar L. caterpillars  [PDF]
Ilijin Larisa,Peri?-Mataruga Vesna,Radoji?i? R.,Vlahovi? Milena
Archives of Biological Sciences , 2010, DOI: 10.2298/abs1001027i
Abstract: Morphometric changes of A1, A1' and A2 protocerebral dorsomedial neurosecretory neurons, total brain protein content and brain protein profiles were analyzed in 4th instar Lymantria dispar larvae under elevated rearing density, i.e. under intense stress when 5 larvae were kept in a petri dish (V = 80 ml), less intense stress when 5 larvae were kept in a plastic cup (V = 300 ml). In the control samples the larvae were reared in isolated conditions. Protein pattern changes in the brain were observed. Proteins with the following molecular masses: 30, 14, 10 and 3.4-2.5 kD were detected in the experimental groups. The size and cytological characteristics of protocerebral dorsomedial neurosecretory neurons were changed under elevated rearing density.
Weight Differences of Male and Female Pupae of Gypsy Moth (Lymantria dispar) and Host-Sex Preference by Two Parasitoid Species Lymantrichneumon disparis and Exorista larvarum  [PDF]
Mohammad-Reza Babaei,H. Barari,K. Kara
Pakistan Journal of Biological Sciences , 2009,
Abstract: Weight differences of male and female pupae of gypsy moth [Lymantria dispar L. (Lepidoptera: Lymantriidae)] and its two parasitoids Lymantrichneumon disparis (Poda) (Hymenoptera: Ichneumonidae) and Exorista larvarum (L.) (Diptera: Tachinidae) host preference were examined in this study. Lymantria dispar pupae were collected from trunks and branches of 20 Ironwood trees (Parotia persica) in two sampling dates, 10 July 2005 and 24 July 2005. The pest pupae were weighted and then saved at room temperature until adults of gypsy moth or its parasitoids emerged. The most L. dispar pupae collected in the first sampling were male whereas those in the second one were female and both male and female pupae in the second sampling were smaller than those in first sampling. The majority of male pupae (98.29%) were less than 0.6 g and most of female pupae (79.39%) were more than 0.6 g in weight. The most of L. disparis emerged from male pupae of L. dispar, whereas the majority of E. larvarum emerged from female pupae. Implications of the results for biological control strategy of gypsy moth are discussed.
The Lymantria dispar IPLB-Ld652Y Cell Line Transcriptome Comprises Diverse Virus-Associated Transcripts  [PDF]
Michael E. Sparks,Dawn E. Gundersen-Rindal
Viruses , 2011, DOI: 10.3390/v3112339
Abstract: The enhanced viral susceptibility of the gypsy moth (Lymantria dispar)-derived IPLB-Ld652Y cell line has made it a popular in vitro system for studying virus-related phenomena in the Lepidoptera. Using both single-pass EST sequencing and 454-based pyrosequencing, a transcriptomic library of 14,368 putatively unique transcripts (PUTs) was produced comprising 8,476,050 high-quality, informative bases. The gene content of the IPLB-Ld652Y transcriptome was broadly assessed via comparison with the NCBI non?redundant protein database, and more detailed functional annotation was inferred by comparison to the Swiss-Prot subset of UniProtKB. In addition to L. dispar cellular transcripts, a diverse array of both RNA and DNA virus-associated transcripts was identified within the dataset, suggestive of a high level of viral expression and activity in IPLB-Ld652Y cells. These sequence resources will provide a sound basis for developing testable experimental hypotheses by insect virologists, and suggest a number of avenues for potential research.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.