1,915 research outputs found
The eradication of insect pests - Some observations on the Argentine Ant campaign in Western Australia
To an entomologist, and especially an economic entomologist, the word eradication means the destruction of all members of a species of insect in any particular area. It means the perfection of a project in the control of an economic insect pest.
Adapted from an address given before the Australian Institute of Agricultural Science (West Australian Branch), by the Retiring President (Mr. P. N. Forte, B.Sc, Agric.) on April 13, 1956
Winter pests in the pasture
ALTHOUGH the pests concerned in attacking winter pastures are known to most farmers a discussion of their control and relative importance will not be out of place.
The principal pests concerned fall into two groups. Firstly the red-legged earth mite and lucerne flea whose attacks are most noticeable soon after germination and secondly a group of caterpillars which appear about the same time and whose attack is not noticed until a large amount of damage has been done
The control of mealy bug on vines in Western Australia
The mealy bug (Pseudococcus maritimus Ehr.) was first recorded on vines in Western Australia in 1898 (A. M. Lea, 1898). Since then it has been reported present in certain years in large numbers with consequent loss of quality in the vine products
Anomaly-Induced Magnetic Screening in 2+1 dimensional QED at Finite Density
We show that in 2+1 dimensional Quantum Electrodynamics an external magnetic
field applied to a finite density of massless fermions is screened, due to a
-dimensional realization of the underlying -dimensional axial anomaly
of the space components of the electric current. This is shown to imply
screening of the magnetic field, i.e., the Meissner effect. We discuss the
physical implications of this result.Comment: 8 pages, DFTT-93-10 [ Eq.(15) and (16) were scrambled in previous
version
Equilibrium molecular energies used to obtain molecular dissociation energies and heats of formation within the bond-order correlation approach
Ab initio calculations including electron correlation are still extremely
costly except for the smallest atoms and molecules. Therefore, our purpose in
the present study is to employ a bond-order correlation approach to obtain, via
equilibrium molecular energies, molecular dissociation energies and heats of
formation for some 20 molecules containing C, H, and O atoms, with a maximum
number of electrons around 40. Finally, basis set choice is shown to be
important in the proposed procedure to include electron correlation effects in
determining thermodynamic properties. With the optimum choice of basis set, the
average percentage error for some 20 molecules is approximately 20% for heats
of formation. For molecular dissociation energies the average error is much
smaller: ~0.4.Comment: Mol. Phys., to be publishe
The effectiveness of dieldrin for control of the Argentine ant in Western Australia
The results of three experiments to compare insecticides for the eradication of Argentine ants are reported. The areas used for the tests were typical household allotments in Shenton Park, a suburb of Perth, Western Australia. The methods of application of sprays and evaluation of results were the same as described in a previous paper. (Forte & Greaves 1953.
New insecticides for the control of the Argentine ant in Western Australia
The Argentine Ant (Iridomyrmex humilis Mayr), has been the subject of much investigation in Western Australia. Jenkins (1943), Jenkins and Forte (1946, 1951), Jenkins (1948) and Forte (1949) have reported results of extensive work on the control of this pest. The results of the investigations have shown that effective control can be obtained by the use of DDT sprays but that large scale eradication was not possible with DDT
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