Stephanie Slinksi, Citrus Research and Development Foundation bactericide project manager, discussed grower trials on the use of bactericides for HLB at the Florida Citrus Growers’ Institute in Avon Park and summarized the presentation.
“We have a series of field trials set up throughout Florida to test the efficacy of oxytetracycline and streptomycin just in the grower program,” Slinski says. “So these are very simple field trials to evaluate controls and treatments within grower groves.”
So far, she says, results “have been extremely variable … Some groves are good, some look not so good. I don’t have a conclusion at this time.” In some trials, fruit drop was less and yields were higher in treated groves; in some cases, fruit drop was less and yields were higher in untreated groves. “And I can’t tell you why, and I don’t know if I’ll ever be able to tell you why,” Slinski says.
“Because these are perennial crops, it is possible that it will take a couple of years to see results,” Slinski adds. “It takes a while for the trees to repair themselves and to take on that healthy appearance and start improving yield and decreasing fruit drop.” Researchers advised growers that bactericides could take a few years to show maximum results when growers were first authorized to use the products in the spring of 2016.
source: citrusindustry.net
