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The presence and spread of  Listronotus setosipennis  (Coleoptera: Curculionidae) and  Zygogramma bicolorata  (Coleoptera: Chrysomelidae) released in 2017 for the control of  Parthenium hysterophorus  (L.) (Asteraceae: Heliantheae) at two locations in Ethiopia (Arba Minch and Mojo) were assessed twice (July, September) in 2018. At Arba Minch, no  L. setosipennis  was found, only  Z. bicolorata  established and the number of eggs varied from 1.4±0.71/plant (July) to 7.41±4.52/plant (September) at the release site and from 0.52±0.18/ plant (July) and 0.68±0.24/plant (September) at the dispersal site. At Mojo, only  L. setosipennis  established with 3.87±1.18 eggs/plant (July) at the release spot and 10.76±1.64 eggs/plant in September whereas after dispersal the eggs numbered 8.69±3.2/plant (July) and 14.98±1.73/ plant (September). After one year,  L. setosipennis  and  Z. bicolorata  were found 51.75±3.95 m and 94.15±13.66 m away from the release spots, respectively. The results show that the biocontrol agents have started to establish and have dispersed at the two locations in Ethiopia.

journal of biological control

"Survival and dispersal of the stem-boring weevil, Listronotus setosipennis, and the leaf-feeding beetle, Zygogramma bicolorata, one year after their release for the control of the invasive weed, Parthenium hysterophorus, at two locations in Ethiopia"