Potato Diseases

Question 1

What is the difference between dispersal of late blight and early blight?

Answer 1

Late blight is dispersed through seed, wind, and soil, while early blight is dispersed through seed, wind, and plant debris.

Question 2

What are the six types of potato diseases?

Answer 2

1. Fungal Diseases
2. Bacterial Diseases
3. Viral Diseases
4. Diseases by nematodes
5. Herbicide Damage
6. Environmental Disorders.

Question 3

What kinds of diseases are late and early blight?

Answer 3

Fungal diseases

Question 4

Which 4 crops are mostly affected by late blight and early blight?

Answer 4

Potato, Tomato, Eggplant and Peppers.

Question 5

Which disease caused the Irish potato famine?

Answer 5

Late blight

Question 6

What are some signs and symptoms of late blight?

Answer 6

lesions on leaves with fuzzy white growth. Discoloration on potatoes and mold. It can spread in storage.

Question 7

List 5 pre-planting management options for late blight.

Answer 7

1. Cultivar: Some cultivars are more resistant than others.
2. Sit selection: Site with good air movement and drainage.
3. Crop rotation: rotation of 2-3 years of non-host crops.
4. Elimination of overwintering inoculum
5. Only plant-certified seed tubers.

Question 8

List 4 management options for late blight in established potato fields.

Answer 8

1. Irrigation: reduce the time leaves are wet.
2. Fertilization: do not use excessive fertilizer.
3. Scouting for disease
4. Fungicide application

Question 9

List 2 harvest and storage management options for late blight.

Answer 9

1. Destroy foliage to present inoculation.
2. Infected tubers should be removed before storage.

Question 10

What are the symptoms of early blight?

Answer 10

Small and dark necrotic legions on leaves. Water soaked legions on tubers, legions on stems.

Question 11

Are there any resistant cultivars for early blight?

Answer 11

No

Question 12

What are 6 management techniques for early blight?

Answer 12

1. Select a late-season variety
2. Irrigation: Do not keep the leaves wet.
3. Scout fields for infection
4. Rotate foliar fungicide.
5. Rotate fields to non-host crops for at least 3 years.
6. Irradicate weed hosts to reduce inoculum.

Question 13

What kind of a disease is Leak (Wet Rot)?

Answer 13

Fungal Disease.

Question 14

What are the signs and symptoms of leak?

Answer 14

Spongy, wet internal rot of tubers.

Question 15

What kind of a pathogen is leak a result of?

Answer 15

Soil born pathogen.

Question 16

When can leak cause significant losses?

Answer 16

During storage

Question 17

What environment is favored by leak?

Answer 17

warm and moist conditions at harvest and early storage.

Question 18

How does the pathogen that causes leak penetrate potatoes?

Answer 18

Through wounds and lenticles.

Question 19

What kind of a disease is Black scurf?

Answer 19

It is a fungal disease.

Question 20

What kind of defects does Black scurf have?

Answer 20

External defects.

Question 21

What is the cause of dispersal in Black scurf?

Answer 21

Seed and Soil.

Question 22

What are some signs and symptoms of Blackscruf?

Answer 22

Sclerotia on tubers, sprout infection, and root legions.

Question 23

What does Blackscruf lead to?

Answer 23

Reduces emergence yield.

Question 24

What kind of a disease is sclerotia stem rot?

Answer 24

Fungal disease

Question 25

When is sclerotia stem rot most likely to be found in potatoes?

Answer 25

In fields close to canola or other susceptible crops. Also within wet canopies.

Question 26

How can you manage this disease?

Answer 26

Fungicides

Question 27

What kind of a disease is Black Leg and soft rot in potatoes?

Answer 27

Bacterial disease

Question 28

What kind of a disease is Black Leg and soft rot in Canola?

Answer 28

Fungal disease

Question 29

What is the common symptom between blackleg in Canola and blackleg in potato?

Answer 29

Wilting

Question 30

What are the 4 methods of dispersal for Black leg?

Answer 30

Seed, Water, Soil and storage

Question 31

What kind of defects does blackleg have?

Answer 31

Internal and external

Question 32

At which stage does blackleg occur?

Answer 32

Can occur at any stage.

Question 33

What are some signs and symptoms of Blackleg?

Answer 33

Inky, black decay that usually begins from seed piece, and wilting.

Question 34

When is Blackleg most detrimental?

Answer 34

When in storage. infected tubers get soft rot and pass on the soft rot to all other potatoes under poor storage conditions.

Question 35

Which environment does blackleg favor?

Answer 35

Warm and wet conditions

Question 36

What are two ways to manage Blackleg?

Answer 36

Sanitation and Resistance in some varieties.

Question 37

What kind of bacteria causes Bacterial Ring Rot?

Answer 37

Gram positive

Question 38

Is Bacterial rig rot localized or systemic?

Answer 38

Systemic

Question 39

What is the method of dispersal for bacterial ring rot?

Answer 39

Seed, water and soil

Question 40

What kind of defects does bacterial ring rot cause?

Answer 40

External and Internal

Question 41

What is the symptom of bacterial ring rot?

Answer 41

Ring formation on potatoes.

Question 42

What kind of a disease is the common scab?

Answer 42

Bacterial disease.

Question 43

What kind of a bacterial pathogen causes the common scab?

Answer 43

Soil-born

Question 44

What are the ideal environmental conditions for the common scab?

Answer 44

warm, dry and soil pH of 5.2

Question 45

What are the signs and symptoms of the common scab?

Answer 45

Corky raised or pitted legions

Question 46

What are 3 ways to manage the common scab?

Answer 46

1. Chloropicrin soil fumigation 2. Scab tolerant varieties 3. Rotation with small grains and alfalfa.

Question 47

What are the 3 common potato viruses?

Answer 47

Potato virus A, Y and V.

Question 48

How are the 3 potato viruses transmitted?

Answer 48

by Aphids

Question 49

What is the sign of potato viruses?

Answer 49

Mosaics.