Ma'anar ƙamus na "fungus gnat" ƙaramin kuda ne mai launin duhu wanda galibi ana samunsa a cikin ƙasa mai ɗanɗano ko a ciki da kewayen kwayoyin halitta masu ruɓe. Tsutsa na naman gwari suna cin naman gwari da kayan shuka masu lalacewa, yayin da manya sukan ci abinci nectar ko wasu ruwan shuka. Kwayoyin naman gwari na iya zama matsala a wasu lokuta a cikin gidaje ko wuraren zama, kuma a wasu lokuta suna haifar da lalacewa ga tsire-tsire ta hanyar ciyar da tushen ko yada cututtukan shuka.