Lucerne seed web moth (Etiella behrii) in lentils, field peas, lupins, soybeans (WA, SA, VIC, NSW), and peanuts (QLD)
||Vegetative – early pod development
|Find insects and damage
- Incidence and abundance varies by season. Severe infestations can result in a loss of yield and quality.
- Etiella flights commonly occur in mid to late September and often coincide with early pod development in pulses.
- Larvae burrow into pods within 24 hours of hatching. They feed on pods and seeds, remaining in pods until entire content has been eaten.
- Frass is left in the pod, and adjacent pods may be webbed together as larvae move between pods.
|Frass and larvae in pods, and adjacent pods webbed together as larvae move between pods.
- Seeds usually only partially eaten out, often with characteristic pin-hole damage.
- Damage is difficult to grade out and unattractive appearance reduces seed quality.
- Peanuts are at particular risk during end-of-season droughts when the dry soil allows larval access to the pods.
- The etiella degree-day model forecasts timing of initial moth flight using daily max/min temperatures from June 21 onwards. Start monitoring for moth flights when the model reaches 351 D-days. For more information and to download the Excel file, visit SARDI.
- An etiella pheromone is available for use in sticky traps.
- Moths are attracted to lights from around mid August.
- Avoid moisture stress during early podding
- Early planting of crops should ensure that most pods are set before moth activity occurs in spring
- Control weeds – rattle pods are favourite weed hosts (QLD)
||Recommended action threshold
- 1-2 etiella moths in 20 sweeps (lentils)
- Chemical control of etiella is only effective on adult moths. Once larvae are in pods they cannot be controlled by insecticides.
- Successful control relies on thorough crop monitoring in order to time insecticide applications to target adult moths prior to egg lay.
- Continue monitoring for 1 week after chemical applications
- Typically only the first generation of etiella are of concern. However, in late finishing seasons, a second generation may also cause significant seed damage.
- In some years both helicoverpa and etiella moths can be controlled with one spray.
- Etiella is associated with aflatoxin in peanuts.
|Communicate and discuss management of etiella
||Growers and agronomists can discuss:
- Effective weed control strategies
- Planting times to ensure podding before moth flights
- Use of day degree model
- Monitoring frequency and techniques
- Area wide coordination of management methods such as weed control and trapping strategies.
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