Development of boscalid for Sclerotinia disease control in vegetable crops in Australia

Size: px

Start display at page:

Download "Development of boscalid for Sclerotinia disease control in vegetable crops in Australia"

Grace Owen
5 years ago
Views:

1 Development of boscalid for Sclerotinia disease control in vegetable crops in Australia Doug Wilson Nufarm Australia Limited Hoong Pung & Susan Cross Peracto Pty Ltd

2 Sclerotinia sclerotiorum Sclerotinia minor

3 Fungicide Rank* Sclerotinia activity on beans & lettuces Sumisclex 5 Similar to Filan most of the time, but seems better under very high pressure + constant wet conditions ** Endocrine disruptor health safety concern? Filan 4-5 Similar to Sumisclex most of the time, except under constant wet conditions Switch 3-4 Similar to Filan, but Filan seems better at very high disease pressure Shirlan 2-3 Got efficacy at low rate, but maybe more effective at higher rates Rovral 0-3 Resistant isolates recorded Zero control if fungicide resistance isolates are present Amistar 0 Little or no control Folicur 0 Little or no control * 0 = no control, 5 = best control ** Endocrine disruptors are chemicals that may interfere with the body s endocrine system. The endocrine system is a system of glands, that produce more than 20 major hormones to regulate the body. The endocrine system is instrumental in regulating mood, growth and development, tissue function, and metabolism, as well as sexual function and reproductive processes.

4 Boscalid (Filan) almost equivalent to procymidone (Sumisclex) Merseylea Trial 2005 % Bean plants infected by white mould 3 sprays at 7 day intervals; 1st spray at 20-30% open flower Untreated control Amistar WG 300g/ha Sumisclex 1.0L/ha Filan 1.0kg/ha

5 Filan Point Unique chemistry Inhibits respiration at the fungal cell level. Low mammalian toxicity. Very safe to beneficial insects. Does not bio-accumulate. Notes Fungicide Group 7. Similar to,but different from the strobilurins. Classed as reduced risk by the EPA in America. E.g.predatory mites. Animals residue free >7day.

6 Boscalid (Filan) a new carboxamide chemistry Carboxamide Group Target site Chemical group Common name Complex 11 SD inhibitors Phenyl-benzamide benodanil flutolanil mepronil Furan-carboxamide fenfuram Oxathiin-carboxamide carboxin oxycarboxin Thiazole-carboxamide thifluzamide Pyrazole-carboxamide furametpyr penthiopyrad Pyridine-carboxamide boscalid Pyridinyl-e-benzamide fluopyram

7 Boscalid disease spectrum Boscalid controls disease in 3 of the 4 classes of fungi. This is is contrast to early carboxamide products such as carboxin that were active only on basidiomycetes. Class Example Boscalid Oomycetes Pythium, Phytophthora, downy mildew No activity Ascomycetes Sclerotinia, active Ascochyta Basidiomycetes Stem rust? active Deuteromycetes Alternaria, Botrytis active

8 Filan (boscalid) Mainly for Botrytis, sclerotinia and alternaria = bo sc al id. Single-site activity so resistance is an issue. Quite persistent so soil residues require management.

9 Boscalid MRL for wine

10 Boscalid soil residues after 3 months?, but no detectable level of residue in follow on crops

11 Levels of disease control by fungicides are affected by other factors such as : Disease pressure Soil types Locations Weather & crop conditions

12 Product & timing of applications on beans Merseylea, Tasmania % Sclerotinia infected plants 3 sprays applied at late flowering sprays applied at early flowering 0 Control Amistar 0.5L Filan 1.0kg Filan 1.0 kg early application

13 Impact of the 1st fungicide application on beans Trial at Merseylea Flowering based on % plants with first flower Untreated control 90% plants with 1st flower 10% plants with 1st flower %Diseased plants %Plants with severe infections

14 Du-Wett improves Filan performance Activator slightly reduces its performance when sprayed under alternate wet / dry crop conditions % Sclerotinia infected plants +/- standard error Untreated control w ithout adjuvant Filan 250gai Filan 500gai Filan 250gai + Du-Wett + Du-Wett + Activator Filan 500gai + Du-Wett Filan 250gai + Activator Filan 500gai + Activator

15 Lettuce targeted application method

16 Managing Sclerotinia diseases Fungicide efficacy Optimising application methods Reduce conditions that increase disease Du-Wett improves fungicide coverage and absorption if applied under dry conditions

17 Leaf wetness in crop canopy major factor in disease incidence & severity Wetness % /2 14:21 27/2 1/3 3/3 5/3 7/3 9/3 11/3 13/3 15/3 17/3 19/3 21/3 Trial at Merseylea % Sclerotinia infected plants sprays at 7 day intervals; 1st spray at 20-30% open flowers Control Amistar WG Sumisclex Filan

18 120.0 Constant wetness in a bean crop Merseylea Wetness % /1 12:09 26/1 28/1 30/1 1/2 3/2 5/2 7/2 9/2 11/2 13/ % Plants with severe infection - Sclerotinia wilting/wilted plants at 1 day before harvest 0 Untreated control Folicur 0.35L/ha Shirlan 0.25L/ha Filan 1.0kg/ha Filan 1.0kg + Du-Wett

19 Planned registered use of Filan label extension for Sclerotinia control Carrots, Lettuce, Cabbage, Broccoli Brussels sprouts, Chinese cabbage, Beetroot, Green beans, Snow peas, Green peas, Spinach,Onions.

20 Thank you

Developing alternate fungicides to control white blister disease in Brassica crops

Developing alternate fungicides to control white blister disease in Brassica crops Hoong Pung Peracto Pty Ltd Project Number: This report is published by Horticulture Australia Ltd to pass on information