Linda, you'll need to be a bit more specific for us to help you. Is the entire blue center done and then you just go around the entire thing with white? Or are you knitting a few stitches in white, the large center in blue, then a few stitches in white again? If that is the case, you need to twist/wrap the blue and white yarns once when you knit the next color in order to avoid a hole, sort of like when you are doing intarsia

Here is a link that might be useful: avoiding a hole

What I do in crocheting is not tie on my new color or skein but just hold it and make a loop and put the hook thru the loop and start crocheting also it is better to start a new skein or color at the end of a row so there will be no hole.
Hope this helps
Darlene

I'm doing six in white then 100 in blue then six in white again. I'm doing the border as I knit the whole blanket

Then the link I gave you will help you avoid the holes.

Yes Donna the link you gave me helped. The patteren Is knit 6 purl what ever is in the center then knit 6. next row is knit 6 knit the center then knit 6. I have trouble twisting the yarn from the knit then to the purl. But I'm getting it. again thank you Linda