Hi, dear Atousa

Study this link:

https://www.researchgate.net/publication/322986834_Effect_of_population_density_of_the_Azolla_weevil_Stenopelmus_rufinasus_on_the_surface_cover_of_the_water_fern_Azolla_filiculoides_in_the_UK

Hi,

Dear Samaneh thanks a lot for your answer. this paper is so great, however I read it before. my main problem is in my Azolla propagating ponds that need to be completely freed of weevils. as you know for some experiments even one insect in experimental diet would be problematic. in winter Azolla growing in the propagating temporary ponds and yet it is infested with the weevils and in summer they causing severely damage on Azolla and wont let it to grow. I failed to clean these pond despite of using both systemic and contact insecticides and now I am asking for advise from others. many thanks

best regards