Rhs 3 – Pests And Diseases: Plant Diseases

Front 1

Description of Rose blackspot

Back 1

Description: Fungal infection of leaves

Front 2

Damage caused by Rose blackspot

Back 2

Damage: Dark brown or black spots on leaves, yellow/chlorotic leaves, premature leaf fall

Front 3

Cultural control of Rose blackspot

Back 3

Cultural control: Grow resistant cultivars/species, remove and burn infected leaves and prunings

Front 4

Biological control of Rose blackspot

Back 4

Biological control: None

Front 5

Chemical control/method of application for Rose blackspot

Back 5

Chemical control: Contact/systemic fungicide, high volume sprays

Front 6

Description of Botrytis (grey mould)

Back 6

Description: Fungal infection occurring in cool, humid or wet conditions

Front 7

Damage caused by Botrytis

Back 7

Damage: Grey, mouldy rot of soft tissues, including leaves, stems, flowers, and fruits

Front 8

Cultural control of Botrytis

Back 8

Cultural control: Good hygiene, reduced humidity, increased ventilation

Front 9

Biological control of Botrytis

Back 9

Biological control: None

Front 10

Chemical control/method of application for Botrytis

Back 10

Chemical control/method: Contact/systemic fungicide, high volume sprays

Front 11

Description of Damping off

Back 11

Description: Soil-borne disease of seedlings which is caused by several different fungi and fungus-like organisms.

Front 12

Damage caused by Damping off

Back 12

Damage: Rot leading to collapse and death of roots and lower stem in seedlings

Front 13

Cultural control of Damping off

Back 13

Cultural control: Good hygiene, good ventilation, sterile soil media, avoid sowing seeds too densely, avoid excessive wetness

Front 14

Biological control of Damping off

Back 14

Biological control: None

Front 15

Chemical control/method of application for Damping off

Back 15

Chemical control/method: Contact fungicide applied as drench or soil additive

Front 16

Description of Coral spot

Back 16

Description: Fungal infection, mild pathogen

Front 17

Damage caused by Coral spot

Back 17

Damage: Death of stems, dying back into live wood. Orange pustules appear on surface of infected wood.

Front 18

Cultural control of Coral spot

Back 18

Cultural control: Cut out infected areas back to healthy tissue. Prune buds in late winter, in dry weather.

Front 19

Biological control of Coral spot

Back 19

Biological control: None

Front 20

Chemical control/method of application for Coral spot

Back 20

Chemical control/method: None

Front 21

Description of Honey fungus

Back 21

Description: Soil-borne fungal infection

Front 22

Damage caused by Honey fungus

Back 22

Damage: Infection of roots, leading to death of stems, leaves, and ultimately the entire plant

Front 23

Cultural control of Honey fungus

Back 23

Cultural control: Grow resistant species. Dig out and burn infected plants.

Front 24

Biological control of Honey fungus

Back 24

Biological control: None

Front 25

Chemical control/method of application for Honey fungus

Back 25

Chemical control/method: None

Front 26

Description of Powdery mildew

Back 26

Description: Fungal infection of soft tissue

Front 27

Damage caused by Powdery mildew

Back 27

Damage: Grey moldy infection of foliage, flowers, and fruits; stunted growth and distortion of infected tissue.

Front 28

Cultural control of Powdery mildew

Back 28

Cultural control: Grow resistant species/cultivars, cut out and burn early infections, avoid soil dryness, avoid excessive wetness and humidity around foliage.

Front 29

Biological control of Powdery mildew

Back 29

Biological control: None

Front 30

Chemical control/method of application for Powdery mildew

Back 30

Chemical control/method: Contact/systemic fungicides, high volume sprays

Front 31

Description of Rose rust

Back 31

Description: Fungal infection of foliage

Front 32

Damage caused by Rose rust

Back 32

Damage: Orange pustules on lower leaf surface, yellowing of upper leaf surface, stunted growth.

Front 33

Cultural control of Rose rust

Back 33

Cultural control: Grow resistant species/cultivars, cut out and burn infected tissue, remove and burn dead leaves as soon as they fall.

Front 34

Biological control of Rose rust

Back 34

Biological control: None

Front 35

Chemical control/method of application for Rose rust

Back 35

Chemical control/method: Systemic fungicide, high volume spray

Front 36

Description of Sudden oak death (Phytophthora ramorum)

Back 36

Description: Fungal-like pathogen affecting a range of woody species

Front 37

Damage caused by Sudden oak death (Phytophthora ramorum)

Back 37

Damage: Bleeding cankers (dark red to black sap oozing from the trunk); may progress to the point of girdling the stem, resulting in rapid death of the tree. Symptoms following stem girdling are rapid, uniform death of the crown, with shriveled leaves remaining attached to the stems even after death.

Notifiable disease.

Front 38

Cultural control of Sudden oak death (Phytophthora ramorum)

Back 38

Cultural control: Notify FERA (Food Environment Research Agency). Grow resistant species. Burn infected material. Good hygiene practices (sterilize equipment between pruning susceptible plants). Avoid wounding plants to reduce infection possibilities.

Front 39

Biological control of Sudden oak death (Phytophthora ramorum)

Back 39

Biological control: None

Front 40

Chemical control/method of application for Sudden oak death (Phytophthora ramorum)

Back 40

Chemical control/method: None

Front 41

Description of Cucumber mosaic virus

Back 41

Description: A viral infection of cucumbers and tother members of Cucurbitaceae

Front 42

Damage caused by Cucumber mosaic virus

Back 42

Damage: General stunting of the plant, with a reduction in yield and distorted fruits. Leaves become mottled with yellow.

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Cultural control of Cucumber mosaic virus

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Cultural control: Selection fo resistant cultivars, such as Cucumber 'Crispy Salad'. Control of weeds around the garden prevent the virus from surviving on alternative host plants. Aphid control reduces risk of transmission.

Front 44

Biological control of Cucumber mosaic virus

Back 44

Biological control: None

Front 45

Chemical control/method of application for Cucumber mosaic virus

Back 45

Chemical control/method: None

Front 46

Description of Potato leaf curl virus

Back 46

Description: Viral infection of potatoes, which can affect or be hosted on other solanaceous plants.

Front 47

Damage caused by Potato leaf curl virus

Back 47

Damage: Rolling of lower leaves, sometimes extending to upper foliage. Leaves are often dry and crisp, with brown margins. Plants may be stunted and general crop yield is reduced.

Front 48

Cultural control of Potato leaf curl virus

Back 48

Cultural control: Use only certified seed potatoes from reputable distributors. Apply effective aphid control programs to limit the spread of the disease. Control weeds to reduce risk of infection from alternate hosts. Remove and burn infected plants.

Crop rotation.

Front 49

Biological control of Potato leaf curl virus

Back 49

Biological control: None

Front 50

Chemical control/method of application for Potato leaf curl virus

Back 50

Chemical control/method: None