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Botrytis grey mould and frost in lentil crops

Botrytis grey mould lentilThis is an industry alert regarding the activity of Botrytis Grey Mould (BGM) activity in lentil crops across South Australia.

Key Message

Conditions have been favourable for Botrytis Grey Mould (BGM) activity in lentil across SA , therefore it extremely wise to protect the highly valued crop. Lentil crops that have been affect by frost will be more susceptible to the severity of BGM.

BGM is very difficult to control in lentil crops post canopy closure. Dense canopies which retain humidity, will favour disease development. PBA Hurricane and PBA Flash are classified as moderately susceptible (MS) to BGM. Lentil crops with BGM will require ongoing fungicides sprays while the weather remains showery. In dry and warmer conditions BGM spread will slow down.

Frosted lentil crops

Lentil crops that have been frosted (severity will vary from crop to crop) will be more susceptible to BGM as the pathogen will rapidly infect the damaged foliage. Extra monitoring is required to estimate the potential need for sprays every 2 -3 weeks depending on rain events. Carbendazim and procymidone are the preferred products to be used with best efficacy against BGM.

Treatment pre canopy closure – if crop has not yet closed over

Apply fungicide pre canopy closure to provide crop best protection again the fungal disease.
The aim is to get the fungicide (carbendazim) to the bottom of the plant to stop the BGM from developing in the micro-climate near ground level under plant canopy.

Treatment post canopy closure

Post canopy closure in lentil crops it is extremely difficult to get fungicides down to the sight of action (disease) under in the bulk of the canopy, and all fungicides will struggle to be effective. Fungicides after canopy closure will protect the upper canopy from infection.

Experience from 2010 in Queensland of BGM on desi chickpea, found both mancozeb and Captan helped to suppress BGM so long as canopy closure sprays were applied. Without canopy closure sprays, all products struggle to be effective.

Monitor and apply fungicide every two to three weeks prior to a rain event while rainy conditions persist. The aim is to protect any new growth and also to protect flowers, pod and seedling against the disease activity.

Pulse Australia is aware that the supply of carbendazim and procymidone are all but being exhausted across some areas of the southern region. Talk to your reseller and advisor about what is available in your area. Pulse Australia have obtained permits for an additional product (Captan) for the control on botrytis grey mould in lentil. This product may not be the first choice for efficacy against BGM but does have some activity.

Captan (800 & 900 g/kg Captan products)

APVMA Permit PER81406

This permit is in force from 28 July 2015 to 30 September 2018 for use in chickpea and lentil for the control of ascochyta blight and botrytis grey mould. Use rates:

  • 1.25 kg/ha (800 g/kg products)
  • 1.11 kg/ha (900 g/kg products)

Acknowledgements:

Dr Jenny Davidson, Senior Plant Pathologist, SARDI
Helen Richardson, Plant Pathologist, DEDJTR, Horsham Vic
Southern Pulse Agronomy Team
GRDC

Further information:

 

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