I've grown a few pumpkins over the years. There are a few large growers here on TBN. I plant between 2-3 acres a year. I till and cultivate until the plants fill in the rows, so weeds are generally not a problem. I've been really lucky when it comes to bugs. I've only had two or three years where I had to spray.
I like long (500 feet) and wide row spacing (10-12 feet). I use both a Cole 12MX and JD 71 planter to plant the seed. I like to plant between the 7th and 15th of June. I have planted as late as July 4th and still have great crops. The Cole 12MX plants in hills of 3-4 seeds spaced 36 to 40 inches apart in the row.
Fantastic looking pumpkins. I hope I can do half that well with my patch. Do you scout for insects and only spray when you see evidence? What insect control chemical do you use? I have heard about a bug that bores into the stems and kills the entire plant. Do you know what that would be?
I keep an eye out for cucumber beetles. If I see them very early when the plants are small in under 6 leaf stage I'll spray with seven. If I see them later after the plants have vined I don't bother spraying. I have been very lucky and have had little insect or disease problems. I always rotate my patches and I am sure that helps. I am further north than you are and we have deep frosts which I am sure kills many insects as well. The most common disease problem I have is powdery mildew.
I think the insect you are asking about is the squash vine borer. In all the years I have planted pumpkins I have only seen these once. I know some pumpkin farmers have rigorous spray schedules to control diseases and insects but they have large investments and must avoid the risk of losing their crops. I give most of my pumpkins away so if I have a bad year I only hope for a better crop next year.
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Squash Vine Borer
The squash vine borer is a pest on pumpkins, squash, marrow and gourds. The adult is an attractive clear-winged moth with black and orange body and orange legs fringed with long, black hairs. The larva is the destructive stage of this pest as it feeds within the vine and causes the plant to wilt and/or collapse often causing death. Although squash is the preferred host, butternut squash is apparently immune to this pest."