Macadamia Seed Weevil formally called Sigastus Weevil
In the last five years, Sigastus has emerged as a very serious pest in Northern Rivers of NSW. We have begun collecting information about the Sigastus Weevil problem and have conducted a survey of growers to help us get a better picture of the problem.
A Report will be distributed within the next couple of months but it is likely to take years to answer these important questions.
Link to Preliminary Sigastus Report
Natural Enemies of Sigastus Weevil
Sigastus adult and external damage and egg laying site.
Sigastus weevil damage to husk and pulled back to reveal sigastus egg
Parasitoid of Sigastus weevil
Assassin bug nymph attacking a weevil (this weevil is not Sigastus)(Pic by J Coates)
Parasitoid larva feeding on of Sigastus weevil larva - Species. unknown at this stage (Pic by J Coates)
Sigastus weevil parasitoids are out there. These were caught overnight in a plate trap - water plus some detergent.
Assassin bug moving in on a cluster of sigastsus weevils. (Jarrah Coates)
Sigastus larva in macadamia nut (Jarrah Coates)
Tachinid fly maggot feeding on a Sigastus weevil larva - Species. unknown at this stage (Photo, J. Coates)
Magpies have also been observed feeing on Sigastus adults.