Effects of Spined Soldier Bug (Hemiptera Pentatomidae) Augmentation and Sticky Barrier Bands on Gypsy Moth (Lepidoptera: Lymantriidae) Density in Oak Canopies2

1994 ◽  
Vol 29 (3) ◽  
pp. 339-346 ◽  
Author(s):  
Kevin W. Thorpe ◽  
Ralph E. Webb ◽  
Jeffrey R. Aldrich ◽  
Kathy M. Tatman
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Larval Density ◽  
Podisus Maculiventris ◽  
Egg Masses ◽  
Oak Trees ◽  
Gypsy Moths ◽  
Spined Soldier Bug ◽  
Augmentative Releases

The effects of sticky barrier bands, augmentative releases of the spined soldier bug, Podisus maculiventris (Say), and the deployment of P. maculiventris pheromone on gypsy moth, Lymantria dispar (L.), larval density in the canopy of oak trees were tested. Sticky barrier bands used alone reduced larval gypsy moth density by ≈35%. The release of 5,810 P. maculiventris nymphs per tree or the deployment of P. maculiventris pheromone to trees on which sticky barrier bands had been applied had no additional effect on gypsy moth larval density. None of the treatments affected the number of gypsy moth egg masses produced. Significantly more P. maculiventris adults were observed on trees with the pheromone, but higher numbers of nymphs were not subsequently observed on these trees. Counts of gypsy moths beneath burlap bands prior to gypsy moth pupation were about four times higher on unbanded than on banded trees, but counts of pupae beneath burlap bands did not differ between treatments.

scholarly journals Effectiveness of Diflubenzuron and Bacillus thuringiensis Against Gypsy Moth Populations

1997 ◽  
Vol 14 (3) ◽  
pp. 135-140 ◽  
Author(s):  
Kevin W. Thorpe ◽  
Richard L. Ridgway ◽  
Ralph E. Webb
Keyword(s):  
Bacillus Thuringiensis ◽  
Population Density ◽  
Gypsy Moth ◽  
Mass Density ◽  
Larval Mortality ◽  
Larval Density ◽  
Egg Mass ◽  
Percent Reduction ◽  
Moth Population ◽  
Oak Trees

Abstract Aerial applications of Bacillus thuringiensis Berliner subsp. kurstaki (74.1 billion international units/ha per application; single and double applications), diflubenzuron [69 g (ai)/ha], and no treatment were evaluated. Treatment effects were estimated from frass collections, defoliation, counts of pupae under burlap, and egg-mass counts. Estimates of larval density in the canopy 20 days after treatment ranged from 318.3 to 55.5 larvae per m² in the control- and diflubenzuron-treated plots, respectively. Larval density was reduced in all treatments, and was lowest in the plots treated with diflubenzuron and two applications of B. thuringiensis. Population density rapidly declined in the control plots, and by June 20, when larvae were predominantly in the fifth and sixth instars, no significant differences in larval density were detected among the treatments. Significantly less defoliation occurred to oak trees in the treated plots, but no differences were detected among the spray treatments. Counts of pupae under burlap, postseason egg-mass counts, and percent reduction in egg-mass density did not differ significantly among treatments or versus controls. These results suggest that diflubenzuron and double B. thuringiensis treatments caused higher levels of larval mortality than occurred with a single B. thuringiensis application, but that with a naturally declining gypsy moth population the final levels of damage were the same under all treatments. North. J. Appl. 14(3):135-140.

CAUSES AND ECOLOGICAL IMPLICATIONS OF EGG RETENTION IN THE GYPSY MOTH, LYMANTRIA DISPAR (L.) (LEPIDOPTERA: LYMANTRIIDAE).

1987 ◽  
Vol 119 (9) ◽  
pp. 765-771 ◽  
Author(s):  
Pedro Barbosa ◽  
Peter Martinat
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Egg Production ◽  
Pupal Development ◽  
Egg Retention ◽  
Gypsy Moths ◽  
Ecological Implications ◽  
Pupal Size ◽  
Food Consumed

AbstractThe role of starvation, the occurrence of mating, and delays and the onset of mating on the retention of eggs by the gypsy moth, Lymantria dispar (L.), were evaluated. The mating status of female gypsy moths did influence egg retention.Mating delays did not affect egg retention. Differences in the number of females retaining some eggs were found among females whose larvae had been reared on different host plants. The amount of food consumed had a significant effect on egg retention. Partial starvation had an impact on egg retention and on larval and pupal development, pupal size, and total egg production. The greater the starvation the greater the egg retention. The ecological implications of these results are discussed.

scholarly journals The influence of the solar flux at 2.8 GHz on outbreaks of gypsy moth (Lymantria dispar L.) (Lepidoptera: Lymantriidae) in Serbia

2010 ◽  
Vol 62 (4) ◽  
pp. 1021-1025
Author(s):  
M. Milenkovic ◽  
V. Ducic ◽  
B. Milovanovic
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Solar Flux ◽  
Gypsy Moths

The connection between the solar flux at 2.8 GHz (based on mean monthly values) and the outbreaks of gypsy moths (Lymantria dispar L.) in Serbia was investigated. The researches included six outbreaks from 1952 to 2007. The average values of the solar flux ranged between 83.8 and 101.8 sfu during the outbreaks, whereas they were between 147.9 and 188.3 sfu for the periods without outbreaks. The results of the research showed that the increase in the number of gypsy moths appears when the values of the solar flux at 2.8 GHz range from 70 to 120 sfu.

IMPLICATIONS OF TREE MICROHABITAT PREFERENCES OF COMPSILURA CONCINNATA (DIPTERA: TACHINIDAE) FOR ITS EFFECTIVENESS AS A GYPSY MOTH PARASITOID

1982 ◽  
Vol 114 (7) ◽  
pp. 617-622 ◽  
Author(s):  
Ronald M. Weseloh
Keyword(s):  
Larval Development ◽  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Laboratory Experiments ◽  
Gypsy Moths ◽  
Compsilura Concinnata ◽  
Microhabitat Preferences

AbstractTethered gypsy moth larvae, Lymantria dispar (L.) (Lepidoptera: Lymantriidae), placed in various tree microhabitats were most heavily parasitized by Compsilura concinnata (Meigen) (Diptera: Tachinidae) near the ground especially on leaves. In laboratory experiments, hosts were parasitized primarily between 6:00 AM and 6:00 PM (E.S.T.), with little parasitism at night. These data suggest that in the field, this tachinid will most efficiently attack young gypsy moth caterpillars, as instars 1 to 3 are the only ones consistently on or near foliage during daylight. C. concinnata females successfully parasitized young hosts, but larval development on 2nd instars was twice as long as that on 4th instars. Thus, only one generation of parasitoids on gypsy moths is likely per year. Results indicate that methods for improving the effectiveness of this parasitoid should emphasize increasing adult numbers early in the season.

Efficacy of Aerially-Applied Gypchek against Gypsy Moth (Lepidoptera: Lymantriidae) in the Appalachian Highlands2

1992 ◽  
Vol 27 (4) ◽  
pp. 337-344 ◽  
Author(s):  
John D. Podgwaite ◽  
Richard C. Reardon ◽  
Gerald S. Walton ◽  
Jeffrey Witcosky
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Inclusion Bodies ◽  
Egg Masses ◽  
Nucleopolyhedrosis Virus

Gypsy moth, Lymantria dispar L., populations in six northern Virginia plots were aerially treated with the nucleopolyhedrosis virus product, Gypchek. Two applications of an aqueous Orzan LS-Pro Mo-Rhoplex B60A tank mix, each at 18.7 liters and 1.25 × 1012 polyhedral inclusion bodies per ha, reduced larvae by more than 92% and egg masses by more than 94% in all but one of the treated plots. Defoliation averaged 22% in Gypchek-treated plots compared to 67% in control plots.

EFFECTS OF DENSITY ON THE PROPORTION OF MALE AND FEMALE PUPAE IN GYPSY-MOTH POPULATIONS

1985 ◽  
Vol 117 (5) ◽  
pp. 535-539 ◽  
Author(s):  
Yves Mauffette ◽  
Luc Jobin
Keyword(s):  
Population Dynamics ◽  
Linear Regression ◽  
Sex Ratio ◽  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Larval Density ◽  
Dynamic State ◽  
Regression Analyses ◽  
Important Indicator ◽  
Male And Female

AbstractThe numbers of larvae and pupae of the gypsy moth, Lymantria dispar L., were monitored in southwestern Quebec from June through August 1980 at 13 sites. In 10 sites, the proportion of male pupae was significantly different from an expected proportion of 0.5. Linear-regression analyses of the proportion of male pupae on larval density showed a significant increase in the number of male pupae with increasing larval density. Changes in the sex ratio could be an important indicator of the dynamic state of a population, and should be considered in modeling the population dynamics of gypsy moth.

scholarly journals Mitochondrial Gene Sequence (COI) Reveals the Genetic Structure and Demographic History of Lymantria dispar (Lepidoptera: Erebidae: Lymantriinae) in and around China

Insects ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 146 ◽  
Author(s):  
Yao Xu ◽  
Sufang Zhang ◽  
Hongbin Wang ◽  
Mei Wang ◽  
Guohong Li
Keyword(s):  
Genetic Structure ◽  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Demographic History ◽  
Mitochondrial Gene ◽  
Dna Barcode ◽  
Full Length ◽  
Coi Gene ◽  
Gene Sequences ◽  
Gypsy Moths

The gypsy moth, Lymantria dispar, is among the most destructive quarantine pests of forests. Here, we reconstructed the genetic structure and determined the population differentiation of gypsy moths across its distribution range at different times. This information could be used to both improve the prevention and detection of gypsy moths in the field. Using 31 newly designed species-specific primers targeting fragments of 216–1102 bp, we identified 103 full-length cytochrome oxidase subunit I (COI) gene sequences from eight fresh samples and 95 L. dispar specimens collected between 1955 and 1996, mainly in China. Combining 103 full-length COI gene sequences with 146 COI gene sequences from Genbank or DNA barcode libraries, we analyzed the genetic differentiation, gene flow and haplotypes between gypsy moth populations in order to reflect the genetic structure and population dynamics of gypsy moths. We discovered 25 previously unknown haplotypes from old gypsy moth specimens. We found that the genetic diversity among gypsy moth populations (collected in the same region at different time points) was relatively high. Furthermore, the genetic structure of Chinese geographical populations (Heilongjiang, Liaoning, Beijing) in different years was distinct. Our results suggested that some gypsy moths in China showed the genetic affinity with European gypsy moths (a sub-species of gypsy moths found mainly in Europe).

Influence of burlap-band colour on larval, pupal, and egg-mass counts of Lymantria dispar (Lepidoptera: Lymantriidae)

2003 ◽  
Vol 135 (6) ◽  
pp. 869-877
Author(s):  
David B. Roden
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Field Experiments ◽  
Quercus Rubra ◽  
Egg Mass ◽  
Egg Masses ◽  
Band Position ◽  
The Mean ◽  
Pupation Site ◽  
Selection Of

AbstractThis paper describes the effect of the colour of burlap bands (black versus naturally coloured or tan burlap) affixed to red oak, Quercus rubra (L.) (Fagaceae), and how it influences selection of larval resting site, pupation site, and egg-mass counts of gypsy moth, Lymantria dispar (L.). In field experiments with half black and half tan burlap bands, the mean number of larvae, pupae, and egg masses were significantly greater under the black section of burlap. Individual burlap bands composed of either black or tan burlap affixed to separate trees produced similar significant results for larvae and pupae. When two burlap bands composed of opposite colours (black versus tan) were affixed to the same tree, significantly more larvae were found under the upper band, regardless of colour. In contrast, pupa and egg-mass densities were significantly greater under black bands, regardless of band position.

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