farmwriter":3l90im4s said:
Okay, so do I need to do this, Dun? I've never seen any lumps (and certainly nothing with maggots coming out of it) so should I be concerned just because I see evidence of the flies a few times?
If it matters, I've got neighbors with cows and I'm pretty confident they're not using a grubicide.
You can wait till next fall and treat them with a wormer that also gets grubs. Won;t do anything for the ones that are there now but will keep them from developing next year. Check around, a GOOD cow vet is a place to start and find out when you're heel fly season is and when treating for them is recommended.
The grub sort of looks like a maggot on steroids. Light brown/tan. Just before they;re ready to emerge they're slightly bigger in diameter then a filter on a cigerette.
(I'm kind of wondering that if you're seeing the lumps now that they were already there and your worming killed them before they could develop fully. Just sort of spitballing an idea)