Diseases of Vegetable, Ornamental and Spice Crops

QUESTIONS

Q.1. Tick the correct answer?
1) White downy growth of Phytophthora infestans appears on:

(a) Under surface of leaves (b) Upper surface of leaves
(c) On both surfaces of leaves (d) None

2) Phytophthora nicotianae var. parasitica overwinters in soil in the form of:

(a) Oospore (b) Chlamydospore
(c) Both oospore and chlamydospore (d) None

3) Buckeye rot symptoms appear on:

(a) Leaves (b) Red fruits (c) Immature green fruits (d) On both leaves and fruits

4) Infection of buckeye rot fungus takes place through:

(a) Rain splashed zoospore (b) Oospores
(c) Conidia (d) Chalamydospores

5) Target board effect is the characteristic symptom of:

(a) Alternaria solani (b) Alternaria alternata (c) Alternaria alternata f.sp. lycopersici (d) None

6) Symptoms of Alternaria alternata f.sp. lycopersici appear as:

(a) Angular spot (b) Round spot
(c) Rectangular spot (d) None

7) Spot on leaves are not surrounded by yellow halo

(a) Alternaria solani (b) Alternaria alternata
(c) Alternaria alternata f.sp. lycopersici (d) None

8) Spores of Septoria lycopersici are produced in

a) Pycnidia b) Acervulus
c) Pseudothecia d) Cleistothecia

9) The centre of Septoria leaf spot in tomato is:

a) White b) Grey
c) Brown d) Dark brown

10) In Fusarium wilt symptom appear as:

a) Yellowing of lower leaves b) Without yellowing of leaves
c) Browning of lower leaves d) None

11) The forms of conidia of Fusarium oxysporum f.sp. lycopersici are:

a) Micro and macro conidia b) Micro only
c) Macro only d) None

12) Powdery mildew of tomato is caused by :

a) Sphaerotheca fuliginea b) Erysiphe cichoracearum
c) Leveillula taurica d) Erysiphe cichoracearum and Leveillula taurica

13) Root rot and collar rot in tomato is caused by :

a) Rhizoctonia solani b) Sclerotinia sclerotiorum
c) Macrophomina phaseolina d) None

Answers of Q. 1. 1. a. 2. c. 3. c. 4. a 5. a 6. a 7.c 8. a 9. b 10. a 11 a 12 d 13 a.

Q. 2. Fill in the blanks

1. Rhizoctonia solani survives in soil in the form of ----------------------------------.
2. Concentric dark brown rings appear on immature green fruits of tomato in -------------------- disease.
3. Buckeye rot pathogen is ----------------------- borne.
4. Staking of plants is the important cultural practice for the management of -------------------- disease of tomato.
5. Septoria lycopersici overwinters in ---------------------------.
6. Browning of vascular bundles is caused in -------------------------------------.
7. Phoma fruit rot of tomato is caused by--------------------------------------.

Answers: 1. Sclerotia 2. Buckeye rot 3. Soil 4. Buckeye rot 5. Plant debris 6. Fusarium wilt 7. Phoma lycopersici and P. destructiva

Subjective type questions

1. Enlist important fungal diseases of tomato along with their causal agents and describe buckeye rot of tomato in detail.
2. Write down the symptoms causal agent and management practices of late blight of tomato.
3. Mention important leaf spot diseases of tomato along with their causal organisms and describe their management practices in detail..
4. Write management practices for following diseases:
a. Fusarium wilt
b. Septoria leaf spot