Late blight has been discovered in New Jersey tomato and potato crops.

But cases have been isolated, and commercial producers have been able to prevent blight by spraying, said Andy Wyenandt, a specialist in vegetable pathology with Rutgers Agricultural Research and Extension.

“It’s not a major threat,” Wyenandt said July 10. “The trouble comes with personal growers and organic growers.”

No new reports of late blight had been received by Rutgers the week of July 8, Wyenandt said.

Late blight is not uncommon in New Jersey, he said, but it has shown up earlier than usual, the product of a wet June.