The disposable yellowjacket trap contains a fast-acting attractant that starts working as soon as you add water or diluted apple juice. Lured by the scent, yellow jackets enter through the yellow top cap and drown in the water. This trap is especially effective in late summer and early fall when yellow jackets seek moisture to survive. The disposable yellowjacket trap is completely disposable which eliminates touching the bait or the yellowjackets.