Fungicides

Question 1

Name the 4 types of activity that Fungicides have on fungal development

Answer 1

1 - Protectant (At Spore germination stage) Applied before infection
2 - Curative (Penetration to Blistering stage) Applied to control existing infection
3 - Eradicant (At blistering stage) Applied to inhibit infection showing symptoms
4 - Anti-Sporulant (Sporulation stage) Applied to prevent and reduce established infections, crop shows symptoms

Question 2

State the 2 biochemical M.O.A sites of Fungicides

Answer 2

1 - Single Site
2 - Multi Site

Question 3

With examples name 4 Fungicide chemical groups

Answer 3

1 - Stobiluarins eg Amistar (azoxystrobin)
2 - Triazoles eg Plover (diffenoconazole), Rudis (prothioconazole), Odin (tebuconazole)
3 - SDHIs eg Reflect (isopyrazam)
4 - Phenylamides eg SL567A (metalaxyl-M)
5 - CAAs eg Revus (mandipropamid)
6 - Dithiocarbomates eg Mazate (Mancozeb)

Question 4

List the benefits of mixing actives from each chemical group

Answer 4

1 - Increase number of diseases treated
2 - Reduce risk of resistance developing

Question 5

List 3 fungicide products with a mix of actives from each group

Answer 5

1 - Nativo (trifloxystrobin + tebuconazole)
2 - Amistar Top (azoxystrobin + difenconazole)
3 - Signum (pyraclastrobin + boscalid)
4 - Perseus (fluxapyroxad + difenconazole)

Question 6

Describe each of the following activity on fungal diseases
1 Stobiluarins
2 Triazoles
3 SDHIs
4 Phenylamides
5 Dithiocarbamates

Answer 6

1 - Mostly Protectant
2 - Systemic offering eradicant activity
3 - Protectants - broad spectrum and persistent
4 - Systemic
5 - Contact protectant

Question 7

Which Fungal group is least suited to oomycete Diseases and which is best suited

Answer 7

Least = Triazoles
Most = Phenylamides

Question 8

Describe the Following
1 Systemic
2 Translaminar
3 Anti-sporulation
4 Multi Site

Answer 8

1 - Moves within plant
2 - Moves across leaf
3 - Prevents sporulation
d - Has more than one M.O.A