Thread subject: Diptera.info :: Fly causing severe agricultural damage in Namibia (Africa)
Posted by CarlosNA on 18-05-2021 16:02
#1
Dear All,
We are developing an agricultural Project in Southern Africa for asparagus (asparagus officinalis), and there is a type of fly that is causing a severe damage on the crop. The fly lays its eggs on the shoot of the plant, the larves follow the shoot and end up eating the crown (plant brain) and the "eyes", where the new asparagus shoot will come.
Is there someone that could please help to identify this species?
Also, if someone may indicate any type of control method (chemical or biological) on the larves and puppae that are in the soil, it would help a lot.
It is first time that we see something like that... But well, new places, new enemies and adventures....
I attach hereby some pictures of the adult + larves + puppae. Let´s see if someone is able to identify it. I thank you very much for your invaluable help!
Edited by CarlosNA on 18-05-2021 16:21
Posted by Tony Irwin on 18-05-2021 16:50
#2
Platystomatidae -
Elassogaster species, I think. In Australia,
E. linearis has been recorded in rotting asparagus crowns.
Posted by CarlosNA on 18-05-2021 18:13
#3
Thank you very much Tony, highly appreciated. I will do some research about
E. linearis accordingly.
If someone can help with current control methods for the adult/larva, IPM, whatever, I would be very thankful!
Regards,
Carlos
Posted by Andrew Whittington on 14-06-2021 09:15
#4
Certainly
Elassogaster probably
E. vanderwulpi Hendel 1914. There is so little known of the biology for Afrotropical Platystomatidae, that control and IPM is going to be a learning curve and may have to start with first principles and whatever words for associated taxa (Tephritidae) for example.
The link with asparagus in the Afrotropical context is new and I was unaware of the E. linearis association - Tony, do you have a reference for that please?
Regards,
Andrew
Posted by Tony Irwin on 14-06-2021 10:39
#5
https://media.aus...mplete.pdf
McAlpine, D.K. (2001) Review of the Australasian Genera of Signal Flies
(Diptera: Platystomatidae).
Records of the Australian Museum Vol. 53: 113–199 - (See page 153, bottom of left column)
Posted by Nosferatumyia on 14-06-2021 12:53
#6
There are many other pests of Asparagus, and platystomatids are predominanly secondary inviders, infesting plants mainly damaged by caterpillars or weevil grubs, eating mostly rotting tissues of the plants. So, it has not been proven if really this fly caused damage to asparagus, which can be eaten by a moth caterpillar or fruit fly maggots.
Posted by Andrew Whittington on 15-06-2021 12:57
#7
Thank you Tony!
Yes, Val, I totally agree. Most Platystomatidae are saprophagous (even
Rivellia feeding on root nodules may be attacking diseased tissue).