Download or read book Parasites of Gypsy Moth Lymantria Dispar L in Low level Host Populations Within a Vermont Focal Area written by Margaret Skinner and published by . This book was released on 1987 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Gypsy Moth written by Charles C. Doane and published by . This book was released on 1981 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Gypsy Moth written by Michael L. McManus and published by . This book was released on 1980 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gypsy Moths Lymantria Dispar in the Niagara Region written by Dayle M. Belme and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The gypsy moth, Lymantria dispar, a major defoliator of broad leaf trees, was accidentally introduced into North America in 1869. Much interest has been generated regarding the potential of using natural pathogens for biological control of this insect. One of these pathogens, a highly specific fungus, Entomophaga maimaiga, was accredited with causing major epizootics in populations of gypsy moth across the north-eastern United States in 1989 and 1990 and is thought to be spreading northwards into Canada. This study examined gypsy moth population densities in the Niagara Region. The fungus, .E.. maimaiga, was artificially introduced into one site and the resulting mortality in host populations was noted over two years. The relationship between fungal mortality, host population density and occurrence of another pathogen, the nuclear polyhedrosis virus (NPV), was assessed. Gypsy moth population density was assessed by counting egg masses in 0.01 hectare (ha) study plots in six areas, namely Louth, Queenston, Niagara-on-the-Lake, Shorthills Provincial Park, Chippawa Creek and Willoughby Marsh. High variability in density was seen among sites. Willoughby Marsh and Chippawa Creek, the sites with the greatest variability, were selected for more intensive study. The pathogenicity of E. maimaiga was established in laboratory trials. Fungal-infected gypsy moth larvae were then released into experimental plots of varying host density in Willoughby Marsh in 1992. These larvae served as the inoculum to infect field larvae. Other larvae were injected with culture medium only and released into control plots also of varying host density. Later, field larvae were collected and assessed for the presence of .E.. maimaiga and NPV. A greater proportion of larvae were infected from experimental plots than from control plots indicating that the experimental augmentation had been successful. There was no relationship between host density and the proportion of infected larvae in either experimental or control plots. In 1992, 86% of larvae were positive for NPV. Presence and intensity of NPV infection was independent of fungal presence, plot type or interaction of these two factors. Sampling was carried out in the summer of 1993, the year after the introduction, to evaluate the persistence of the pathogen in the environment. Almost 50% of all larvae were infected with the fungus. There was no difference between control and experimental plots. Data collected from Willoughby Marsh indicated that there was no correlation between the proportion of larvae infected with the fungus and host population density in either experimental or control plots. About 10% of larvae collected from a nearby site, Chippawa Creek, were also positive for .E.. maimaiga suggesting that low levels of .E.. maimaiga probably occurred naturally in the area. In 1993, 9.6% of larvae were positive for NPV. Again, presence or absence of NPV infection was independent of fungal presence plot type or interaction of these two factors. In conclusion, gypsy moth population densities were highly variable between and within sites in the Niagara Region. The introduction of the pathogenic fungus, .E.. maimaiga, into Willoughby Marsh in 1992 was successful and the fungus was again evident in 1993. There was no evidence for existence of a relationship between fungal mortality and gypsy moth density or occurrence of NPV. The results from this study are discussed with respect to the use of .E.. maimaiga in gypsy moth management programs.

Download or read book The History Biology Damage and Control of the Gypsy Moth Porthetria Dispar L written by Michael H. Gerardi and published by Fairleigh Dickinson Univ Press. This book was released on 1979 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive study of the life stages, biology, ecology, behavior, dynamics, economic importance, and success and failure of large- and small- scale control programs of the most destructive forest pest in the northern United States today.

Download or read book Parasites of the Gypsy and Brown tail Moths Introduced Into Massachusetts written by Massachusetts. State Forester and published by . This book was released on 1910 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Gypsy Moth and Its Natural Enemies written by Robert W. Campbell and published by . This book was released on 1975 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Patterns of gypsy moth behavior are described, especially those related to population density. Natural mortality-causing factors that operate against this insect are also described. Several agents kill subadult male and female gypsy moths at different rates. Major determinants of year-to-year changes in gypsy moth numbers are described.

Download or read book European Gypsy Moth Lymantria Dispar L Outbreaks written by Christopher Bryn Davidson and published by . This book was released on 2001 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gypsy Moth Management in the United States written by and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gypsy Moth lymantria Dispar and Its Control 1979 April 1988 written by Jerry Rafats and published by . This book was released on 1988 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gypsy Moth Management in the United States written by United States. Forest Service and published by . This book was released on 1995 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Alternate hosts of Blepharipa pratensis Meigen written by Paul A. Godwin and published by . This book was released on 1977 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A current tactic for biological control of the gypsy moth, Lymantria dispar Linnaeus, is to release its parasites in forests susceptible to gypsy moth damage before the gypsy moth arrives. The basic assumption in these anticipatory releases is that the parasites can find and utilize native insects as hosts in the interim. Blepharipa pratensis is being used in this way. The efficacy of such releases has not been demonstrated. The present state of our knowledge about the niche requirements of gypsy moth parasites in general, and B. pratensis in particular, does not permit an evaluation now. However, we do have sufficient information to determine the crucial point of whether B. pratensis can live and develop in particular native lepidopteran species that are potential hosts. We report here on the survival of B. pratensis in eight potential North American hosts.

Download or read book Proceedings U S Department of Agriculture Interagency Gypsy Moth Research Forum 1993 written by Sandra Fosbroke and published by . This book was released on 1993 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gypsy Moth Management in the United States a Cooperative Approach written by and published by . This book was released on 1995 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Gypsy Moth written by Edward Howe Forbush and published by . This book was released on 1896 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Gypsy Moth Porthetria Dispar Linn written by Wilton Everett Britton and published by . This book was released on 1915 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gypsy Moth Management in the United States Appendix G Ecological risk assessment written by and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: