Disease + Fungicides

Question 1

Fungicide chemical groups

Answer 1

Strobulins - amistar
Triazoles - plover, rudis
SDHI
Phenylamides - SL567A (oomycetes)
Dithiocarbamates - mancozeb
CAAs - revus
Biological - serenade

Question 2

Club root brassicas

Answer 2

Soil borne 20 years
Rotation
Hygiene
Variety
ph7.5

Question 3

Leaf spots brassicas

Answer 3

Alternaria, phoma, ringspot, light leaf spot
Disease forecast
Variety/cultivar
Field walk
Amistar top, Nativo, Plover, Rudis, Perseus

Question 4

Powdery mildew brassicas

Answer 4

Signum, Perseus, amistar top, Nativo, plover, rudis

Question 5

Oomycetes brassicas

Answer 5

Downy mildew, white blister
Rotation
Bury trash
Infinito, SL567A (check approval), Revus

Question 6

Sclerotinia

Answer 6

Rotation, bury trash
Signum, Perseus

Question 7

Xanthomonas

Answer 7

Seed borne bacteria 2 years
Clean seed
Rotation
Bury trash
Keep leaves healthy - Amistar Top

Question 8

Spear rot brassicas

Answer 8

Bacterial
Variety
Nutrition

Question 9

Storage diseases brassicas

Answer 9

Botrytis, Phytopthera
Good hygiene
Pre store drench of Serenade
Store management
Careful handling

Question 10

Blight genotypes

Answer 10

Dark green 37 resistant to fluazinam
EU43 resistant to CAAs + oxathiapiprolin

Question 11

Hutton period

Answer 11

2 days of >10 degrees
2 days of 6 hours RH >90%

Question 12

Blight control

Answer 12

Eliminate dumps, volunteers, dont plant where cant spray
Start fungicides at rosette stage, every 7 days
Early season: inifinto, zorvec
Mid season: privest (persistant protectant)
Late season: ranman top (zoospore acitivty)
Loss of mancozeb - key multi site, increases chance of resistance

Question 13

Alternaria potatoes

Answer 13

Warm + wet
Small brown lesions that cross veins
Minimise crop stress
Include mancozeb, carial star, narita, signum into blight programes

Question 14

Rhizoctonia

Answer 14

Stem cankers, black scurf
Seed + soil borne
Lengthen rotation, seed hygiene, plant into warm soil
Maxim seed treatment
Amistar into soil

Question 15

Black dot potatoes

Answer 15

Soil borne
Rotation
Amistar in soil

Question 16

Powdery scab potatoes

Answer 16

Wet + cold
Good drainage, healthy seed, resistant varieties

Question 17

Common scab

Answer 17

Light alkaline soils
Piper susceptible
Use stronger varieties
Irrigation at tuber initiation

Question 18

Blackleg potatoes

Answer 18

From infected seed
Can be same bacteria as soft rot
Good store management, healthy seed

Question 19

Downy Mildew Onions

Answer 19

Warm wet summers
Forecasting, good hygiene, rotation
Infinito, Zorvec, Unicur (onions)
Spray according to risk (5TL latest onions) then once a week

Question 20

Leaf blotch onions + leeks

Answer 20

Good hygiene
Rotation
Unicur (onions) Amistar top (leeks)

Question 21

Leek rust

Answer 21

Amistar Top
Nativo
Rudis

Question 22

White tip leeks

Answer 22

Oomycete
Inifinito

Question 23

White rot

Answer 23

40 years
Soil test
Hygiene
Rotation
Signum

Question 24

Fusarium

Answer 24

Hot + wet
Smells
Rotation, hygiene, good drainage

Question 25

Neck rot

Answer 25

Carried by seed Seen in store Hygiene, rotation Maxim seed treatment, switch

Question 26

Black + Blue mould

Answer 26

Avoid damage to bulbs Store management

Question 27

Bacterial rot

Answer 27

Good hygiene Fast harvest Serenade

Question 28

Sprout control onions

Answer 28

To be stored beyond december Apply MH pre harvest (10-14 days)

Question 29

Cavity Spot

Answer 29

Soil fungi Pythium 10 years Warm + wet Site selection, less susceptible varieties, rotation SL567A 1st TL

Question 30

Sclerotinia Carrots + Parsnips

Answer 30

Wetter areas after full canopy Rotation, care with irrigation, early harvest Signum + Perseus before canopy closure

Question 31

Alternaria Carrots

Answer 31

Forecasting Amistar Top, Nativo, Signum

Question 32

Powdery Mildew Carrots

Answer 32

Hot dry from july Amistar Top, Nativo, Signum

Question 33

Crown Rot Carrots

Answer 33

When crop damaged Control other diseases

Question 34

Violet root rot

Answer 34

Soil borne 15 years Rotation, site selection

Question 35

Downy Mildew Lettuce

Answer 35

Warm + wet, debris, resting spores Forecasting, plough trash, rotation, resistant varieties Infinito, Revus, Orondis, Amistar (Check HI)

Question 36

Botrytis

Answer 36

Wet damaged tissue Minimise plant damage Amistar, Signum, Switch

Question 37

Sclerotinia lettuce

Answer 37

Wet soil borne Rotation Contans pre planting Signum, Perseus, Amistar

Question 38

Leaf + Pod spot, D.Mildew, Botrytis, Footrot peas

Answer 38

Good rotation, drainage Amistar, Switch, Signum

Question 39

Cultural control diseases

Answer 39

Bury trash Remove host weeds Rotation Varieites Site selection Timing

Question 40

Brassica Virus

Answer 40

Turnip Yellow, Cauliflower Mosaic Aphids

Question 41

Products for oomycetes

Answer 41

Infinito SL567A Revus Mancozeb Zorvec