I have a problem with mosquito larave rearing , and I don't know what is the reason , as it was going good before with me but now it comes up and I don't know why?!
The problem is the larvae hatch from egg and feed till the fourth instar and then die!! And I don't know why
I have changed the rearing plated from plastic plate to metal one and also the same
All the steps are fixed as before but the larave still dying reaching the 4th instar
Can any body help with that