Question of the Week – Squash Virus

Did Zack find a hybrid squash-cucumber this past week? What is going on here?

No, this is not a new hybrid squash-cucumber. And no, just because these two crops were planted beside each other, they did not cross-pollinate and create a unique baby. This squash fruit is showing symptoms of a virus. Most viruses in cucurbits are spread by aphid infestations. Several viruses can change the color of cucurbit fruit, so it is hard to tell which virus it is just by visual symptoms. When virus-infected plants (squash in this case) produce off-colored fruit, it is known as color breaking. Many varieties have a genetically enhanced gene that gives them a high degree of resistance to viruses that cause the fruit to change color. Some newer squash varieties have a gene known as “precocious yellow gene” that will mask color breaking, even when the plant is infected by the virus. Discolored fruits are perfectly safe to eat and make a great conversation starter at your next dinner party (you’re welcome). However, they are considered undesirable by commercial growers and produce buyers because of their appearance. Many of our commercial growers choose varieties that will not color break.

This week’s question is from Zack Snipes, Coastal Fruit and Vegetable Extension Agent.