Biological Efficacy of Gypchek Against a Low-Density Leading-Edge Gypsy Moth Population
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چکیده
منابع مشابه
BIOLOGICAL CONTROL Synergy Between Zwittermicin A and Bacillus thuringiensis subsp. kurstaki Against Gypsy Moth (Lepidoptera: Lymantriidae)
Bacillus cereus French & French increased the mortality of 3rd-instar gypsy moths, Lymantriadispar(L.), causedbyBacillus thuringiensis subsp.kurstakiBerliner.B. cereusdidnotcause mortality of L. dispar when applied alone. The activity of various B. cereus strains was correlated positively with their accumulation of zwittermicin A, an aminopolyol antibiotic, in culture. When a constant dose of B...
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Pheromone traps can be used for evaluating the success of treatments that are applied to either eradicate or delay the growth of isolated low-density populations of the gypsy moth, Lymantria dispar (L.). We developed an index of treatment success, T, that measures the reduction in moth counts in the block treated adjusted by the change in moth counts in the reference area around it. This index ...
متن کاملPopulation Dynamics of Gypsy Moth in North America
The gypsy moth, Lymantria dispar, is a major defoliator of deciduous trees throughout the northern hemisphere. Introduced into eastern Massachusetts from Europe in 1868 or 1869, it has gradually spread south and west and will soon occupy most of the hardwood forests in the eastern United States and Canada. The gypsy moth has been the subject of intensive study by scientists throughout the world...
متن کاملMaternal Effects in Gypsy Moth: Only Sex Ratio Varies with Population Density
A number of species of forest caterpillars fluctuate in density with a periodicity of 8–11 yr. One explanation for these ‘‘cycles’’ is that changes in food quality or quantity and crowding influence the growth rate and final size of moths at high density. Carryover of these influences to the next generation through maternal effects could modify the dynamics of the population. To determine wheth...
متن کاملRegression Estimators for Late-Instar Gypsy Moth Larvae at Low Population Densities
Two regression estimators were developed for determining densities of late-instar gypsy moth, Lymantria dispar (Lepidoptera: Lymantriidae), larvae from burlap band and pyrethrin spray counts on oak trees in Vermont, Massachusetts, Connecticut, and New York. Studies were conducted by marking larvae on individual burlapbanded trees within 15-m diameter plots and recapturing them with pyrethrin sp...
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ژورنال
عنوان ژورنال: Northern Journal of Applied Forestry
سال: 2004
ISSN: 0742-6348,1938-3762
DOI: 10.1093/njaf/21.3.144