Syringes are avail anyplace that sells medications for animals like horses. I think that they are available at Tractor Supply.
I inject my squash stems with Thuricide which is a bt solution that I purchase.
I also succession plant my summer squash so that the second crop is growing before the first one might die. Sometimes they get infected anyway even with injections but it takes weeks for the plants to die and I always get plenty of squash. I do not use Sevin. I garden organically.
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