Insect pest risk
|High risk||Moderate risk||Low risk|
|Following a crop with reduced hosting capacity for RLEM (e.g. faba bean, narrow-leafed lupin and lentils).|
|Aphids and virus|
|Slugs and snails|
|Slugs and snails*||Damaging||Damaging|
|Aphids (virus vectors)||Damaging||Damaging||Present||Present|
* Snails may also cause grain contamination at harvest
|Present||Present in crop but generally not damaging|
|Damaging||Crop susceptible to damage and loss.|
Key IPM strategies for faba beans
Both species of helicoverpa can cause damage to pods and developing seed, resulting in yield loss and increased defective seed.
- In the northern region and in irrigation areas of NSW, both species may occur in faba beans, depending on the season. Species composition is influenced by the time of year. In temperate regions (southern Queensland, NSW) the majority of the H. armigera population over-winter from mid-March onwards and emerge during September/October. H. punctigera is usually the dominant species through September.
- The Helicoverpa Diapause Induction and Emergence Tool uses current day length and temperature data to predict the timing of the emergence of moths from overwintering pupae.
- Where both native budworm and corn earworm occur, be aware that insecticide resistance in corn earworm can affect the efficacy of synthetic pyrethroids and organophosphates.
Aphids transmit viruses, such as Bean Yellow Mosaic Virus which causes leaf mottling and plant dwarfing.
- Transmission of viruses in the early stages of crop growth is most damaging.
- Virus transmission typically occurs well before aphid colonies are evident.
- A pre-emptive and integrated management approach (taking into account the risk factors) is required to minimise the impact of virus.