Australian Pulse Bulletin

Lentil fungicide guide: 2018 season

Foliar fungicides will help manage the lentil diseases ascochyta blight (AB) and botrytis grey mould (BGM), but when to commence a fungicide program and how often to spray, depends on the varietal resistance, weather conditions and the potential yield of the crop.

Pulse Australia have a number of Minor Use Permits from APVMA in place for 2018 to help growers with disease control and these are shown in the table below along with all the current registered products. It is particularly important to observe all the conditions set out in these permits for use in lentils as they are all being grown for the human consumption markets, here and overseas, and market access depends on the strict delivery standards and residue limits. There is no secondary market for lentils if these standards are not met.
Fungal disease control is based on protection of plants rather than curing infections. The first fungicide application must be applied as early as necessary to minimise the establishment of the disease. In lentils this coincides with canopy closure. Additional applications may be required if conditions favour the disease.

Fungicides remain effective for approximately 10-14 days under ideal conditions. Keep in mind that all new growth after spraying is unprotected. Timing of fungicide applications is critical. An application in advance of a rain front provides maximum protection. Delaying application until after a rain front reduces efficacy significantly as diseases can be rapidly spread by rain. Close monitoring for early symptoms will assist good disease management decisions.

The need for repeated fungicide applications depends on the growth stage of the crop, the time since the last fungicide application and the likelihood of further conditions favouring disease development. Unprotected crops may be severely affected by disease impacting on yield and grain quality particularly in wet springs.

Seasonal Conditions in 2018

Seasonal conditions have varied widely across Australian cropping areas. After a very hot and dry summer in many regions and variable autumn break for sowing crops, conditions in many regions have become cold and dry, with frosty mornings. In Qld and Northern NSW drought conditions have prevailed with record low rainfall and virtually no winter crops sown. South Eastern NSW has had some reasonable rainfall, but below average, and crops are progressing slowly. In South West NSW though many crops are suffering moisture stress and are well below average. Victoria and South Australia also have had below average conditions but at least have had enough rainfall to get crops established reasonably well. Further rain will be needed in spring to finish these crops. In Western Australia the southern and eastern grain belts have had good conditions. These conditions have meant that diseases have not been favoured even though many need only limited moisture to infect crops (heavy dew may provide enough moisture). Monitoring needs to be continued through the different growth stages of the crop. With good access for ground sprayers this year, allowing for high water rates and canopy penetration, timely fungicide application will give the crop the best chance of a high yield.

For more detailed information on disease management: 

• Lentil: Integrated disease management
• CropPro lentil disease manual
• Fungicide resistance in grain crops (including pulses)

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  Botrytis affecting a susceptible variety (W. Hawthorne)

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  Botrytis on lentil pod (W. Hawthorne)

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  Ascochyta on lentil leaves (J Davidson).

Minor Use Permits for fungicide on lentils

• PER81533 Custodia / Ascochyta blight, grey mould / Current to 30-Sep-2019
• PER81406 Captan / Ascochyta blight, chocolate spot, grey mould / Current to 30-Sep-2023
• PER84408 Boscalid / Chickpeas And Lentils / Botrytis Grey Mould / Current to 30-Sep-2020
• PER84640 Systiva Seed Treatment Fungicide / Rhizoctonia, Fusarium and suppression of Ascochyta Blight / Current to 31-Aug-2018
• PER84641 EverGol Xtend Seed Treatment / Damping off caused by Rhizoctonia, Fusarium and Seedling blight / Current to 31-Aug-2018

Fungicides registered for disease control in lentils

Lentil Foliar Fungicide	Trade Name example	Ascochyta blight	Botrytis grey mould	WHP Harvest
Chlorothalonil 720	CC Barrack 720	1.0–2.0 L/ha	1.0–2.0 L/ha	14 days
Mancozeb 750	Dithane SC	1.0–2.2 L/ha	1.0–2.2 L/ha	28 days
Mancozeb 420	Penncozeb SC	1.8–3.95 L/ha	NR	28 days
Carbendazim	Spin Flo	NR	500 mL/ha	28 days
Captan 900	CC Captan 900	Permit 1.1 kg/ha	Permit 1.1 kg/ha	14 days
Captan 800	CC Captan 800	Permit 1.25 kg/ha	Permit 1.25 kg/ha	14 days
Azoxystrobolin120 + Tebuconazole 200	Custodia	Permit 1.0 L/ha	Permit 1.0 L/ha	28 days
Boscalid	Filian	NR	Permit 1.2 kg/ha	21 days
Metiram700	Polyram DF	1.0–2.2 kg/ha	1.0–2.2 kg/ha	42 days
Procymidone	Sumislex	NR	500 mL/ha	21 days

Many of the Minor Use Permits have short term expiry dates (e.g. 30/11/2017) 

NR = Not Registered 

Read the Label As with any chemical application, care should be taken to observe all the label conditions for each product. Some label advice is different for each state or region, so for best results, it is important that this is followed. Many of our pulse crops are exported for human consumption, so market access is dependent on having the product free of chemical residues. Australian has a reputation for providing clean and safe produce so it is vital that this is maintained by using chemicals according to regulations. All permits have label recommendations for use rate and withholding periods (WHP) that must be observed so grain will comply with Maximum Residue Limits (MRL) allowable for market access.

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Last updated: 24 August 2018