A new alternaria leaf spot of sapindus emarginatus vahl. from india
Inspite of considerable importance of leaf spot diseases much attention has not so far been paid towards them. Severe infections may be responsible for complete defoliations which may ultimately bring the life of the entire plant at stake. During the last three years the author collected a number of leaf spot flmgi from several new hosts in Maharashtra (India). During the cold season of 1963 the writer noticed a distinct leaf-spot disease oil Sapindus emarginatus VAHL., popularly known as "Soapnut-tree" growing ill the Little Flower School premises, Aurangabad. The disease at tracted special attention due to its severe nature and great economic importance of the tree in India as the soapnuts are used as substitute for soap and in medicine. Critical examination of the fungus in sections as well as in culture showed formation of abundant spores and was later identified as a new species of Alternaria. The disease manifests itself in the form of small, circular spots with ashy black to dark brown spots scattered all over the leaf. These spots could be easily recognised from the spots which were previously reported caused by Phyllosticta.
New species of Alternaria from Marathwada (India)
The paper deals with two new species ofAlternaria, Alternaria nyctanthi onNyctanthes arbortristis Linn. andAlternaria tropaeoli onTropaeolum majus L.
Investigations of dielectric gratings using electrodynamic models based on volume integral equations
Eigenmodes of planar and cylindrical dielectric gratings (DGs) and electromagnetic wave scattering from multiplayer DGs are investigated. The DG characteristics are calculated using numerical-analytical solution of integral equations (IEs).