Squash vine borer is not listed on the label.  And Bt is not a recommended treatment for this insect.

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Using pesticides

If pesticides are needed, spray or dust the stems at their base.

• Start treatments when vines begin to run (or the last week of June or early July for non-vining varieties) or when the first adult borers are detected.
• Repeat in 7-10 days.
• Two applications help manage most squash vine borer adults.

For more thorough coverage, continue treatments at 7-10 day intervals until the end of July. Common names of active ingredients effective against squash vine borers are: carbaryl, permethrin, bifenthrin and esfenvalerate.

If your crop is still successfully attacked by borers, you can try to kill the borer inside the vine. Keep in mind that you may not be able to save the plant.

• As soon as wilting is noticed, use a sharp knife to cut a slit in the affected stem.
• Slice carefully up the vine until you locate the borer (or borers).

Once you have killed any borers with the tip of the knife, mound moist soil over the cut area and keep this spot well watered. New roots may grow along the cut stem, allowing the plant to survive.

CAUTION: Mention of a pesticide or use of a pesticide label is for educational purposes only. Always follow the pesticide label directions attached to the pesticide container you are using. Remember, the label is the law.

Be sure that the fruit/vegetable you wish to treat is listed on the label of the pesticide you intend to use. Also be sure to observe the number of days between pesticide application and when you can harvest your crop.”

This quote is from our website on squash vine borers.  See the website for more information: 

https://extension.umn.edu/yard-and-garden-insects/squash-vine-borers