Diseases of Vegetable, Ornamental and Spice Crops

QUESTIONS

Q.No. 1. Fill in the blanks:

i. Crown gall is a ---------------- disease and is caused by -------------------------.
ii. The Agrobacterium tumefaciens is--------------, ------------, and ------------------measuring 0.4-0.8 x 1.0 -3.0 µm.
iii. --------------------------is a non pathogenic strain of Agrobacterium tumefaciens and can be applied as -------------or --------------for minimizing the disease spread.
iv. ---------------, ---------------, ------------------at the tips, -------------on which no terminal blossoms considered as a part of rose mosaic syndrome.
v. Rose mosaic virus is ------------- particle and transmitted mechanically by ----------------or------------- and nematode.

Answer key

i. Bacterial, Agrobacterium tumefaciens ii. Aerobic, gram negative, rod shaped, non-sporulating iii. Agrobacterium radiobacter (K-84), seed, pre-plant dip iv. Stunting growth, smaller leaves, bending, blind shoots v. Isometrical, budding, grafting

Q2.Choose correct answers from the following questions:
1. A non-pathogen strain Agrobacterium radiobacter (K-84) of crown gall bacterium is formulated as

1. Gallex 2. Blitox 3. Bacteriosin

2. Pruning is required to check the infection in the following disease

1. Back spot 2. Crown gall 3. Rust

Answers 1. 1, 2. 2,

Q.3. Enlist important bacterial diseases of rose along with their causal agents

Q.4. What are important virus diseases of rose? Discuss the mode of transmission of mosiac virus.

Q.5. Write short note on the following diseases

1. Crown gall of rose
2. Rose mosaic

Q. 6. Mention control measures of the following diseases

1. Crown gall of rose
2. Viral diseases of rose