Ask your plant question
|
Ask your plant question |
|
|
Citrus Greening Disease
Worse Than Canker
The Most Serious of All Citrus Diseases
| Citrus Greening Disease is the latest
threat to Florida agriculture and homeowner fruit. Whereas Citrus
Canker eradication efforts by the state ($500
million so far) have already killed over 4,000,000 trees, this disease is
said
be capable of far worse tree damage According to a release by the (Florida) Division of Plant Industry, "Citrus Greening Disease or huanglongbing (yellow dragon disease) may be the most serious citrus disease in the world." Citrus Greening Disease is caused by a bacterium yet unnamed. Proposed names include Liberibacter, also seen as Candidatus Liberibacter. Citrus Greening Disease is spread by insects; Citrus psyllid. There are both African and Asian strains of the disease "This is as bad as it gets" said Nathaniel Roberts, general manager of a 4,000-acre Florida grove The Sun-Sentinel also reported 10-13-2005 that Richard Miranda, spokesman for the Florida Department of Agriculture, that there is no cure for citrus greening; Infected trees must be cut down. Among the options to stop citrus greening is the use of pesticides, which he said would be applied only on commercial groves, never in residential areas Known as "Yellow Dragon Disease" in China, citrus greening is found throughout east Asia as well as Brazil, #1 in the world for citrus production. Citrus greening has also infected Saudi Arabia and India The name "Greening" comes from the fact that Citrus Greening Disease causes trees to produce predominantly greened (worthless) fruit which fails to ripen as well as inducing a bitter-salty flavor when processed So far only 12 trees have been cut down and removed in Florida. However, the disease is confirmed in South Florida in Broward and Palm Beach counties. Dean Gabriel, a citrus researcher at the University of Florida said, "I lay the blame on citrus producers for not being more concerned. They were told it was coming. Now they're paying attention, but it may be too late." How citrus greening got to Florida is unknown. There are two varieties: one from Asia and one from Africa Unlike Citrus Canker, Citrus Greening kills trees Citrus Greening is probably the most serious of all afflictions of the citrus species According to the University of Florida, "The Asian citrus psyllid (AsCP), Diaphorina citri Kuwayama, was first detected in Florida by Susan Halbert on June 2, 1998. Its current distribution is along Highway 1 on the east coast of Florida from Broward to St. Lucie counties and is apparently limited to dooryard host plantings. This exotic insect is not now regarded as a major pest in and of itself; however, it is the vector of a serious bacterial disease called citrus greening (CGD) (Liberobacter spp.). In Asia, the major pathogen is L. asiaticum. AsCP could be the most serious pest of citrus in Florida if the bacterium causing CGD is also present." The Florida Department of Agriculture press release dated 09-02-2005 is here Citrus Greening article by Ann Henson Citrus Greening article by Robert Bowden Citrus Greening article by David Fleshler Pictures of affected trees, insects and fruit Other pictures of the insect are seen here |
|
