Microbes and Plant Diseases

Yes, it is the correct answer. It is both a cattle and human disease.

Leaf spot (tikka disease) caused by Cercospora arachidicola is the most widespread and economically important disease of groundnut, affecting both yield and quality. Pad rot occurs but is less common, while leaf blight is not a major groundnut disease.

Bacteriophages undergoes both lysis and lysogeny to express its genes.

Lysozymes synthesised by the phage, attack the wall of the bacteria, causing its lysis and liberation of phages.

Phage is transmitted to the progeny of bacteria by lysogeny.

Bacteriophages undergoes DNA replication within minutes of infecting bacteria. About 100 to 150 molecules are produced at this stage.

Campylobacter is inherently resistant to vancomycin and is selectively isolated on addition of vancomycin.

Thayer-Martin medium does not contain penicillin as Neisseria is susceptible to it.

Roll tube technique is used for stringent anaerobes. It provides an ideal condition for the cultivation of stringent anaerobes (redox potential below - 300 mV) which can be only achieved by the supplementation of media with reducing agents. This method consists of a roller tube in which the organism to be cultivated is immobilised on the side of the tube by a film of serum or other media.

MSA has a high concentration of sodium chloride that selects for members of the genus Staphylococcus as they can tolerate high saline levels. Organisms from other genera may grow, but very weakly.

Alkaline bile oxalate-sorbosebroth with pH 7.6 is the ideal condition for the enrichment of Yersinia enterocolitica.

Appearance of dry, scaly lesions on various parts of the body such as skin, nails and scalp are the main symptoms of a fungal disease. These lesions are accompanied by intense itching and irritation. 

Stem canker of cotton is caused by Phoma exigua fungus. Ramularia gossypii causes aereolate mildew disease in cotton.

Correct answer. Grey rot or Noble rot disease is caused by Botrytis cinerea in grapes. Mycosphaerella angulata and Cercospora brachypus cause angular leaf spot in grapes. Hence, the statement 4 is false.

In barley, white to tan, small and semi-rectangular spot or blotch with a dark brown edge aligned along the veins of the leaf blade is known as Halo spot disease. The causative fungus of the said disease is Pseudoseptoria stomaticola.