Such applications “can be very, very effective in terms of knocking the psyllids down so low that you don’t find them for many months, if not for years,” she said.
The key is to act quickly and aggressively and to coordinate the applications with other groves in an 800-meter radius.
“When groups agree on an area-wide program and act to suppress the psyllid, they can make a huge dent in the population,” Grafton-Cardwell said.
Still somewhat vulnerable, however, are organic groves.
Some approved applications do work, Grafton-Cardwell said, “but they must be applied every 10 days to two weeks, and growers are not seeing very good control.”