Are yellow sticky roll traps more effective than sticky cards?I've used both sticky cards and sticky roll traps in my greenhouse, and here's what I've found. The cards are handy for small spaces or for checking what kind of bugs are around. You just stick a few here and there, and you can see right away if you've got whiteflies, gnats, or aphids showing up. They're cheap, easy to move, and good for monitoring.
But when it comes to actually cutting down the number of insects, the roll traps really shine. One roll can stretch several meters across a row of crops, which means it catches a lot more flying pests in a single shot. Instead of only grabbing insects in one little spot, it acts more like a barrier. Bugs fly through, hit the sticky surface, and that's the end of it. Over a few weeks, you can really tell the difference in how many pests are left buzzing around.
Another thing I like about the rolls is that they save time. With cards, you need to replace and spread out quite a few to cover the same area. With a sticky roll, you just hang it once, and it's working day and night across a whole section. Of course, rolls can be a bit messier to handle - that glue sticks to everything, including your fingers - but once they're up, they do their job without much fuss.
So, are rolls more effective? In my experience, yes, especially if you've got a big greenhouse or field. Sticky Cards Trap are fine for keeping an eye on things, but if you want real pest pressure control, Sticky rolls trap catch way more insects. It's not one or the other - I actually use both: cards for monitoring, rolls for control. That combo keeps the crops in pretty good shape without relying too much on sprays.
