Medical Definition of NEOLOGISM. 1. : a new word, usage, or expression. 2. : a word coined by a psychotic that is meaningless except to the coiner.ull Definition of NEOLOGISM. 1. : a new word, usage, or expression. 2. psychology: a new word that is coined especially by a person affected with schizophrenia and is meaningless except to the coiner. â neÂ·olÂ·oÂ·gisÂ·tic \-Ëae-ËÃ¤-lÉ-Ëjis\ tik. adjective
What is black spot? Black spot is the most serious disease of roses. It is caused by a fungus, Diplocarpon rosae, which infects the leaves and greatly reduces plant vigour. Expect to see leaf markings from spring, which will persist as long as the leaves remain on the plant. The fungus is genetically very diverse and new strains arise rapidly.
For example, nitrogen deficiency causes leaves to yellow, starting with the oldest foliage. Iron-deficient roses yellow between the veins, while magnesium-deficient plants turn yellow starting at the margins. Magnesium deficiency may also cause small brown spots on the leaves.All these deficiencies can be corrected by measuring soil nutrients and pH, then amending the soil accordingly.or example, black spot produces round dark brown to black spotting and yellowing areas on leaves. Rose rust makes a brownish-red spot on the bottom of the leaf and a yellow patch on the top.