Navel Orangeworm Preparation Before Hull Split


In today’s Almond Matters, presented by Valent, navel orange (NOW) monitoring is well underway as growers see split hull on the horizon. High levels of moths NOW are being reported in multiple areas of the state, underscoring the importance of protective action. Todd Burkdoll, field market development specialist at Valent USA, said that one of the most important aspects of NOW damage prevention is how quickly hardware applications run.

“It’s crucial to get the product there, kill any potential eggs or eliminate any larvae that have hatched before they get into that nut,” Burkdoll said. “Again, it is preventive. It is a prophylactic treatment. There are a lot of great chemistries out there that work.

Almonds are most susceptible to NOW upon separation from the shell, allowing females access to lay eggs in the shell to then eat the nut flesh within. Preventive measures are essential to start splitting the hull in the right position to limit problems NOW during harvest. Burkdoll said DiPel can be a very effective and economical tool for growers to tackle NOW without disrupting auxiliaries.

“Getting DiPel on pre-shell separation is key. I would say five to seven days before shell separation is fine, then on shell separation, again, another application. I have seen it do a really good job of preventing the orange Navel worm at harvest and having an infected mess,” Burkdoll noted. “But it’s all about timing and something you have to master.”

Growers will want to pay close attention to their orchards for signs of hull splitting, to ensure applications continue in a timely manner. Burkdoll explained that some of the early varieties may experience shell splitting over the next 10 to 14 days. “We’ll see what he does, but he’s supposed to warm up, which should amp things up a bit. But it also amplifies the pests,” Burkdoll said.

Listen to the report below.


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