South Florida Palms and Lethal Bronzing

There's a new palm disease to be aware of called Lethal Bronzing that can potentially impact some of our most prestigious south Florida. Common symptoms include premature fruit drop (fruit is stunted, brown and or dead along with dead inflorescences), gradual browning of older leaves, then death of young/new fronds and eventually spear leaf death (center most frond growth point). While costly preventative measures are available unfortunately, there is no cure for infected palms and the only course of action once a palm is confirmed as infected is total removal. If you suspect a palm may have Lethal Bronzing please contact the local Broward County Cooperative Extension Service for additional advice and potential testing. Additional information about Lethal Bronzing can be found at the following IFAS website.

 Necrotic lower Sabal Palm fronds and dead spear leaf. (c) The Daytona Beach News Journal 

Canary Palm almost completely dead with spear leaf dying (c) Fox 13 News

Premature fruit drop and necrotic inflorescences of Coconut Palm. (c) The Florida Alligator

New Technology Helping Control Insects

I came across an article detailing a new method to control the insect carrier for the dreaded citrus greening disease. As Florida is one of the nation's largest citrus producing states, any insect or disease that threatens the citrus crop typically receives full and immediate attention. Citrus greening differs from the previously #1 citrus issue citrus canker in a few very important way; citrus greening causes immediate fruit drop, reduces overall fruit yields and ultimately kills the tree within a very short time frame. Citrus canker mainly was a cosmetic issue causing unsightly blemishes to the fruit skin of citrus, but leaving the fruit juice and tree itself in relatively free from any affects. That being said the new technology involves a modified electric fence that hones in on the Asian citrus psyllid the carrier of citrus greening to reduce their numbers and help control the rate of tree infection. To read more about this emerging technology please visit the following web link:

https://www.tcpalm.com/story/news/local/indian-river-county/2018/01/29/psyllid-zapper-resistant-trees-among-tactics-combat-floridas-citrus-greening/1070347001/  

Laurel Wilt Disease

Florida has a robust economy based in large part on the agricultural industry and to a lesser extent revenue sourced from fruit trees such as citrus. Avocado trees are also a part of the fruit trade and recently a disease has arrived that is devastating the avocado tree and its family relative the red bay tree. The redbay ambrosia beetle is host to a fungus that disrupts the transportation of water and nutrients within an infected red bay or avocado tree causing the tree to wilt and eventually die. Identification and removal of potentially infested trees is essential if we want to eradicate this disease and save our beloved Avocado and Redbay trees. Links to information on the diseases and who to report potentially infected trees to is listed below.

Photograph Courtesy of James Johnson, Georgia Forestry Commission

Note frass tubes left by feeding Redbay Ambrosia Beetles.

Redbay Ambrosia Beetle     Laurel Wilt Disease