First it is a zucchini.Second yellow zukes often green up with high temperatures. Of course it is also possible you got some crosspollinated seed. Mosaic virus is also possible, but it does not really look like mosaic.

This post was edited by farmerdill on Thu, Jul 3, 14 at 21:09

I dunno, but if it were me I'd fry it up and eat it while it were bicolored just out of curiosity! lol :D

Mosaic virus looks like the squash has blisters to me; I wouldn't say that.

If you got them from someone, the person probably grows yellow squash & zucchini, and didn't keep them far enough apart. To me, I'd bet that they just got cross pollinated.

Should be fine to eat if that's the case. If you got from the big company, like Burpee, mislabeling is a possibility, but frankly... I've never seen a summer squash they've sold that looks like THAT. And cross pollination is unlikely there, since they keep their plants so far apart to avoid just that. It would be a very rare possibility, but it MIGHT happen.

If you did get it from a big company like that, my next thought would be pesticides.

I purchased a packet of yellow squash seeds at Menards and planted them. They grew super fast and recently I pulled a yellow and green one like what you pictured. It was delicious. Now the same plant seems to be growing an all green one. I also see a smaller all yellow one coming up too. Same Plant! I have not complaints, it's just weird to see.

I wouldn't worry about it .Just eat up.

HU

I had that happen before