MONITORING THE ATTACK PRODUCED BY THE SPECIES CAMERARIA OHRIDELLA DESCHKA-DIMIĆ IN CRAIOVA AREA

Cameraria ohridella Deschka-Dimić is an invasive, monophagous species, extremely dangerous for the ornamental chestnut trees.Following the observations we made, it can be concluded that the southern exhibition is preferred by the larvae of the species Cameraria ohridella Deschka-Dimić, so for observation made in July 2019 the values were 3.6 mines/leaf and 8.7 mines/leaf in August, and this year it was 3.9 mines/leaf for July, reaching 8.9 mines/leaf in August, an indicator that increased rapidly over the time between the two observations and  followed by the leaves with eastern exposure and western.We also noticed that the lowest values of the average number of mines/leaf/foliole were reached on the leaves with northern exposure

STUDIES ON THE USEFUL ENTOMOFAUNA IN SOME VEGETABLE CROPS IN SOUTH OF OLTENIA

Vegetable crops have been the most important technological group that is grown in our country. Due to their multiple importance, vegetable crops have received increased attention both from the scientific and technical point of view. In our country, research on useful entomofauna began after 1929, when the first entomology research unit was set up, namely the "Entomology Station" within the Instituteof Agronomic Research in Romania (Institutul de Cercetări Agronomice din România - I.C.A.R.). This paper aims to bring a great contribution of scientific data regarding useful entomofauna. The research has been conducted in the private stationary unit in Amărăştii de Jos, using three methods of collecting the entomofauna and namely the Barber type soil trap, the frappage method and method of capture by using the entomological net.All the entomofauna collected from the vegetable ecosystem has been subjected to detailed analyzes of the systematic group to which each species belongs.The research has identified 390 species belonging to 7 orders with 15 families. Most species belong to the Scarabaeidae families (5 species), followed by the Chrysomelidae family with 4 species, the Acrididae, Aphididae, Pentatomidae, Cetoniidae, Pieridae and Noctuidae families, each with 3 species, with the rest of the families having 1-2 species

STUDIES ON THE ATTACK PRODUCED BY THE CAMERARIA OHRIDELLA DESHKA-DIMIĆ SPECIES

The horse-chestnut leaf miner (Cameraria ohridella Deschka-Dimić) is a rather dangerous invasive pest because the larvae create galleries in the foliar apparatus of theAesculus hippocastanum L. horse-chestnut, and compromise the aesthetic aspect of the tree.During 2016 and 2017 in the southern area of Oltenia, there were made observations and determinations regarding the degree of damage and the monitoring of theCameraria ohridella Deschka-Dimić species under the microclimate conditions offered by Constantin Poroineanu Park in Caracal.Throughout the entire experimental period, a total number of 9649 adults were captured on the installed traps, out of which 4726 adults were captured in 2016 and more than 4923 adults were captured in 2017.The degree of infestation of the horse-chestnut leaves produced by theCameraria ohridella Deschka-Dimić species was obtained on the basis of the number of galleries/leaf/leaflet made by larvae in an average sample of 100 leaves. The number of galleries per leaf was of 20.9 in 2016 and 54.2 in 2017, the average of the years of research being of 37.5, and the number of galleries per leaflet fluctuated between 2.9 in 2016 and 7.7 in 2017, with an average of the years of research of 50.3

The mixed problem for the Laplacian in Lipschitz domains

We consider the mixed boundary value problem or Zaremba's problem for the Laplacian in a bounded Lipschitz domain in R^n. We specify Dirichlet data on part of the boundary and Neumann data on the remainder of the boundary. We assume that the boundary between the sets where we specify Dirichlet and Neumann data is a Lipschitz surface. We require that the Neumann data is in L^p and the Dirichlet data is in the Sobolev space of functions having one derivative in L^p for some p near 1. Under these conditions, there is a unique solution to the mixed problem with the non-tangential maximal function of the gradient of the solution in L^p of the boundary. We also obtain results with data from Hardy spaces when p=1.Comment: Version 5 includes a correction to one step of the main proof. Since the paper appeared long ago, this submission includes the complete paper, followed by a short section that gives the correction to one step in the proo

The essential spectrum of the Neumann–Poincaré operator on a domain with corners

Exploiting the homogeneous structure of a wedge in the complex plane, we compute the spectrum of the anti-linear Ahlfors-Beurling transform acting on the associated Bergman space. Consequently, the similarity equivalence between the Ahlfors--Beurling transform and the Neumann-Poincare operator provides the spectrum of the latter integral operator on a wedge. A localization technique and conformal mapping lead to the first complete description of the essential spectrum of the Neumann-Poincare operator on a planar domain with corners, with respect to the energy norm of the associated harmonic field