Tobacco mosaic virus was first reported by:
A) Smith
B) Martin
C) Mayer
D) Beijerinck
The nematode Radopholus similis has shown the maximum numbers at a soil depth of:
A) 5-15 m
B) 20-30 m
C) 32-42 m
D) 1-4 m
Some varieties of apple exude toxic wax on the leaf surface to prevent germination of conidia of Podosphaera leucotricha:
A) Scab resistant
B) Leaf blight resistant
C) Powdery mildew resistant
D) Rust resistant
The organism included in order Peronosporales causes the disease known as:
A) Downy mildew
B) Smut
C) Rust
D) Powdery mildew
To which group does Dithane Z-78 belong?
A) Organomercurial
B) Dithiocarbamic acid
C) Heterocyclic nitrogen compound
D) None of these
Trichodorus belongs to the family:
A) Trichodoridae
B) Heteroderidae
C) Nacobbidae
D) Longidoridae
The virus is transmitted by nematode:
A) Globodera
B) Tylenchorhynchus
C) Anguina
D) Xiphinema

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