Alternate host of black stem rust of wheat:
A) Mohania
B) Thalictrum
C) Barberry
D) All above
Association of fungi with roots of higher plants is known as:
A) Lichen
B) Mycorrhiza
C) Ascolichen
D) Basidiolichen
A bacterial cell surrounded by flagella is called:
A) Monotrichous
B) Lophotrichous
C) Amphitrichous
D) Peritrichous
Bacterial leaf blight of rice caused by Xanthomonas oryzae can be identified by:
A) Wilting of the plant
B) Yellowing of leaves
C) Ooze test
D) Defoliation
Blast of rice is caused by:
A) Xanthomonas
B) Drechslera oryzae
C) Pyricularia
D) Cercospora
Bordeaux mixture was discovered by P.A. Millardet of France during 1882 following his chance observation of a farmer's practice for protection against:
A) Plasmopara viticola on grapevine
B) Uncinula nectar on grapevine
C) Podosphaera leucotricha on apple
D) Venturia inequalis on apple
Disease symptoms known as phyllidy in sesame are caused by:
A) Bacterium
B) Fungus
C) MLO
D) Virus

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