My squash plants, started from seed, were looking really good after being transferred to the well fertilized plot for one week. Now I see that the leaves are a bit yellow. I was hopeful that this was the year that I would finally be able to grow zucchini ! Please advise. Also, is there a preventative insecticide (hopefully natural) that I should put on the plants? Thanks
Yellowing leaves can indicate a watering issue; too much or too little.
It could also be a bit of shock from moving, hardening off small plants gradually as you move them to the garden is important.
These links have more information for you.