Holly ChamberlainThe truck-mounted Flicker can detect up to four times the number of Asian citrus psyllids as the traditional tap method of scouting does. Mechanizing insect scouting is winning converts for its efficiencies in the fight against Asian citrus psyllid.
The pest vectors huanglongbing, or citrus greening. Knowing precisely when psyllids appear in a grove, in what numbers and at which life stage helps growers target spray programs more effectively.
“In light of all these diseases, our window for making these [application] decisions is shortening,” says Holly Chamberlain, owner of Pest & Disease Management LLC in Avon Park, Fla.
Chamberlain built the first prototype of the truck-mounted Flicker in 2010 and applied for a patent earlier this year.
Depending on tree size, the device brushes as many as four vertical baffles through foliage to dislodge insects onto two horizontal sticky cards in front of and behind each baffle.
A needle in a haystack
Growers can lease the devices or contract with the company for the scouting service.
“It’s more thorough,” says Shaw ron Weingarten, agricultural technical services specialist for Oviedo, Fla.-based A. Duda & Sons. “It’s more efficient per unit of time.”
Duda has hired Chamberlain’s company to scout 1,100 acres of citrus groves once to twice per month over the past year; the frequency rises during the growing season and drops in winter months.
Tap and visual scouting tend to focus on branches at eye level and below, Weingarten says. The Flicker can cover the full tree height and touch every tree it passes.
That’s particularly helpful where psyllid populations are low.
“There’s no threshold with psyllid,” he says. “If you’re looking for a needle in a haystack, this is the only device I know of to find it.”
During comparison tests where scouts took tap samples on 10 trees in each corner and center of a block, the Flicker always caught more psyllids, Weingarten says. Manual scouting may result in one or two of the target pests; the machine’s sticky cards consistently show three to four times that number.
“You don’t have psyllids if you’re not really looking,” he says.
The pros and the cons
“No sampling method is absolute,” says David Hall, research leader at the U.S. Agricultural Research Service’s horticultural research unit in Fort Pierce, Fla. Hall has run comparison tests on the Flicker to validate it as a sampling method.
Tap sampling doesn’t provide the best results for new plantings under a meter tall. Sticky traps are costly, and weather conditions can skew their results. Without precautions, sweep nets may spread canker.