We began testing these lids in June 2014. For most people, these are the go to lids. The limited ventilation allows the cultures to stay humid. The cause of 99% of fruit fly culture problems is due to low humidity.If you are using FABRIC Vented Insect Lids and you see mold, the culture dies off prematurely, the media gets crusty, or the flies are pupating only at the bottom of the cup, then you will want to use the Vented Insect Cup Lids. FABRIC Vented Insect Cup LidsGreat for:
These are the lids that have been around for decades. It is the lid most people are use to. Due to the amount of ventilation these provide, many people have to continually add water to the culture to keep it from drying out.If you are using the Vented Insect Cup Lid and the media is getting sloshy, or you get tons of larvae, but nothing hatches, then you will want to use the FABRIC Vented Insect Cup Lids.At Josh's Frogs, we're producing over 1,200 cultures a week. The new vented insect cup lids allow for a more stable, longer lived, productive culture in most environments. However, the fabric lids do work very well in high humidity environments, or when ventilation is severely restricted. Watch your cultures and choose the lid that works best for you!