...by the evil Squash Borer! Witness the evil beasties:
and the destruction they have wrought upon my zucchini plant:
My zuchinni plant wasn't looking so hot - leaves turning a sickly yellow - and upon inspection I found that one of my plants had been invaded by the Squash borer. The Horror! I frantically dug them out, but I fear it may be too late for this particular plant. I still have 2 Apparently uninfested plants left - daily monitering will henceforth commence ('cause I am sure they are there - I just can't see them).
Evil, nefarious Squash-Vine Borer!
(thanks to University of Kentucky Entomology for the pic).