I’m a new grower so this may not be anything new to most.
Noticed bugs I cannot identify on my seedling and saw sticky traps as a remedy for most pests that cause issues. Sticky traps are almost always yellow to attract the pests(color of pollen), so just find a yellow sticky note and use some honey. These should be items you have handy. As far as saving money I don’t know because sticky traps are fairly cheap, but if in a bind this will work.