A case of squash vine borers.

I had my first dealings with squash vine borer this year. Some got into the first of the pumpkins I planted. I noticed some of the leaves starting to turn yellow (with green veins)  but only on half or less of the plant.

So I started doing some investigating and found this in the stems. 

As you can see, this section of the stem, near the roots, is starting to split which is a sure indication of a squash vine borer. 

 I cut this section of the vine out and put the small section with the borer in the trash and the rest in the compost pile.  I am growing several pumpkin plants this year (Connecticut field pumpkins) so the loss of half a plant is no great setback.