You may have noticed at the Wistful Wild, every 30 days starting at Day 31, some tiny, odd insects appear. These are not documented in the (in game) Piklopedia. They resemble small, orange half-spheres that scuttle about in their area. One pack is near the entrance of the Hole of Heroes, and the other is to the right of the black gate leading to the Dream Den in the field of Creeping Crysanthemums. These creatures poison your Pikmin, if not white, but can still be destroyed by non-whites. If you use whites, they all will attack them like popping rocks and nectar and spray will appear in the blink of an eye. There will be more sprays than nectar and there should be more than 10. This is good if you like to collect sprays, or really need sprays.
There is a maximum number of sprays and nectar that will come out of the insects (roughly no more than 20 blobs in total are allowed on screen), as soon as the Pikmin start popping them and nothing comes out stop them and absorb everything on the screen. Then continue attacking the insects. Doing this you will get considerably more sprays, its possible to get about 20 of each spray this way.