Zucchini, a delicious type of summer squash, is one of the lesser-known GMO risk crops. It is almost exclusively grown in the United States. There are only about 2,500 acres of GMO zucchini—that’s ten small family farms worth. While there are well over 200 different varieties of GMO corn, there are only two known GMO squash events.

Despite its comparative lack of prevalence, GMO zucchini is widely commercially available in both Canada and the United States. This makes it a high-risk crop under the Non-GMO Project Standard, meaning zucchini and products containing zucchini are subject to particularly stringent requirements—including testing for GMO DNA—before they can become Non-GMO Project Verified.

Zucchini and Mosaic Viruses

While most GMOs are meant to tolerate an herbicide or produce an insecticide, GMO squash is meant to be resistant to certain types of viruses. Zucchini yellow mosaic virus is the most prevalent of these. This virus is transmitted primarily by aphids and causes infected plants to grow small, unhealthy fruit. It is closely related to the ringspot disease in papayas.

As it turns out, these genetic modifications do not do much to protect this summer squash from viruses. GMO zucchini only mitigates mosaic viruses; the plants still get infected and symptoms, albeit less severe symptoms, still appear. Additionally, zucchini remains vulnerable to several other types of viruses that GMOs offer no protection against. Once again, the world’s largest chemical companies have failed to deliver on their promises to farmers.

It’s not surprising that GMO zucchini is not in high demand. Farmers still need to use proper pest-management techniques in conjunction with their virus-resistant crops. This usually means deterring aphids by removing the weeds that host them and introducing natural predators such as ladybugs. It also means planting barrier crops that appeal to aphids. These techniques are just part of a healthy and biodiverse agricultural system to which GMOs are adding nothing but risk. We don’t need GMOs to solve our food system challenges, but we do need effective farming practices! You can help support the farmers who work hard to grow non-GMO zucchini and summer squash by choosing Non-GMO Project Verified squash.


Tags: , , , , ,


Alli Willis

Hi Faith,

Pretty much any crop that is more appealing to aphids than what you are trying to grow can be a barrier crop. If you look at Table 2 here, you can see some ideas! This entire article is a great resource.


I like zucchini – the only squash I like. But I do buy Organic (even though I realize they could be infected by insects, the windm etc.) Hopefully they are more organic than anything else.

Lindsey Rieck

Hi Janis, there are other varieties of genetically modified summer squash such as the yellow crooked-neck squash.

wendy wallace

It seems to me that the GMO zukes have a “rubbery” texture. Anyone else notice that?


I don’t believe so as GMO zucchini has only been genetically changed to become resistant to viruses such as zucchini yellow mosaic virus.


Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.