English to Lithuanian Science Biology (-tech,-chem,micro-)

Sveiki, gal galėtumėt padėti? Niekaip nesuprantu, ką šiuo atveju reiškia "control" : "
The concentration of 0.5% proved to be toxic enough for larvae as well, but the larvae who survived, moulted 2 days later than in the control"
arba
"During the first day both aphids and thrips larvae were active when 0.5% solution were used and there were no differences noticed as compared with the control. "
Dėkui