A) virus
B) bacteria
C) fungus
D) mycoplasma
Correct Answer: D
Solution :
Witches broom is caused by bacteria (mycoplasma). The mycoplasma (PPLO) was first observed by Nocard and Roux, 1898. They are wall less, pleomorphic, unicelled organisms bound by a unit membrane. The genetic material is DNA. They have RNA and ribosomes also. They multiply by budding and cause disease like witches brooms, little leaves, phyllody stunts, dwarfs, stolburs etc. Some of the common viral diseases of plants are: [a] Asteryellow [b] Bean mosaic [c] Bunchy top of banana [d] Curly top of sugarbeet [e] Leaf curl of papaya [f] Tobacco mosaic [g] Wheat mosaic etc.
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