I won't worm without taking in a flock fecal sample to the vet for a float to identify load and species... in order to make sure I am treating for what I have and NOT what I don't. Not all meds treat all species of worm AND not all locations will have the same environmental factors. Use a med that works and NOT hokus pokus like DE, pumpkin seed, or hot peppers.
Also, I never JUST worm on a schedule, especially with the same drug as parasites build resistance and it may not work when you need it to.
Sorry I'm no help with which med to use for which internal parasite... But I can tell you that only 2 types of worms can be seen in dropping. Tape worm and Large round worms, and then only under heavy load. All others will stay in the intestines and ONLY their microscopic oocysts (eggs) will pass in the dropping.
External parasites should also be checked for upon occasion. Looking after roost, after dark, using a flashlight and part feathers under the vent to look for things crawling away or clumps of "dirt" (eggs) near the base of the feather shafts. Some parasites are microscopic (scaly leg mite) while some others don't live on the bird (red mite) and only come out to feed at night. So it's important to look at the clues as well as looking for the pests.
Hope this is helpful and that you are enjoying BYC!
