I have a Zucchini plant in my raised-bed garden. I am a first-time gardener and really don't know what I'm doing! But so far everything has gone great, and the plant has yielded plenty of zucchini. Now, it seems to be dying, with leaves wilting and fewer zucchini. I took a picture of the main part of the plant, it looks to me like there might be ants or some kind of disease, but I don't know what it is or what to do. Can someone help? Thanks!