citrus nutrition

Reducing Psyllid Populations During Key Periods Pays Dividends

Jim Rogers HLB Management, Pesticides, Pests

By Lukasz L. Stelinskiand Jawwad A. Qureshi Asian citrus psyllids (ACP) are at the mercy of their host (citrus) for survival. They need flush to lay eggs and for the nymphs to develop. Prior to HLB, the majority of flushing had been fairly predictable and occurred in the early spring and late summer. The occurrence of flush in young trees …

Developing a Management Plan for Lebbeck Mealybug

Jim Rogers Florida, IPM, Pests

By Lauren Diepenbrock Managing lebbeck mealybug has become an ongoing challenge in many citrus-growing areas of Florida. This pest expanded into 14 counties from 2019 to fall of 2021 and impacts both commercial and residential citrus. Damage includes distorted fruit and leaves, stem dieback and fruit drop. Loss of young trees can occur under extreme infestation scenarios. In addition to …

Pest Management: A New Approach to an Age-Old Challenge

Tacy Callies Pests

By Brad Turner From a family with deep Florida roots, I have over 40 years of experience in commercial citrus production. I learned the industry from the ground up by working in the family groves while studying citrus production at Florida Southern College. I have owned a citrus nursery, my own groves and a citrus caretaking business. I have also …

Three Florida Citrus Pests of Concern

Ernie Neff Pests

Lebbeck mealybug, the Bulimulus sporadicus snail and Brevipalpus mite are Florida citrus pests that were discussed at Citrus Expo in August. University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) entomologist Lukasz Stelinski delivered information about the three pests for fellow UF/IFAS entomologist Lauren Diepenbrock. LEBBECK MEALYBUGLebbeck mealybug damages fruit, leaves and stems. The pest causes fruit drop and …

Australia Launches New Citrus Biosecurity Program

Ernie Neff Diseases, Pests

In recognition of biosecurity threats such as HLB, a new five-year biosecurity program, CitrusWatch, has been launched in Australia. This program is funded by Hort Innovation through the citrus R&D levy and by Plant Health Australia (PHA) using the citrus plant health levy. The program is led by PHA, with Citrus Australia coordinating program activities. The Northern Territory Department of Industry Tourism …

Medfly Quarantine in Southern California

Len Wilcox California Corner, Pests

A portion of San Bernardino and Los Angeles counties have been placed under quarantine for the Mediterranean fruit fly (Medfly) following the detection of two wild flies in and around the city of Upland in San Bernardino County. The U.S. Department of Agriculture (USDA), California Department of Food and Agriculture (CDFA), and the San Bernardino and Los Angeles county agricultural …

Scout for Problems, Even in CUPS

Ernie Neff CUPS, Pests

Growers should monitor for pests and diseases, even in the citrus under protective screen (CUPS) systems designed to keep HLB-spreading psyllids out of trees, according to entomologist Jawwad Qureshi. He told more than 25 people participating in a Dec. 1 virtual seminar that CUPS “are not foolproof systems,” and said citrus can’t be grown successfully without pest management. Qureshi works …

Spider Mites in Florida Citrus

Ernie Neff Pests

By Lourdes Perez Cordero If you are a citrus grower in Central Florida, more than likely you have encountered spider mites. These are a common pest of commercial citrus in the state and their characteristic thin webs make them easy to spot in trees. Spider mites become more abundant between March and June, when the weather conditions are dry, and …

Lebbeck Mealybug Sanitation Strategies

Tacy Callies Pests, Tip of the Week

Lebbeck mealybug was first found causing damage in Florida citrus in Highlands County in 2019. As of this writing, it has now been found on citrus in 14 counties in Florida. This pest likely gains some dispersal assistance from wind events, either being blown on infested plant material or as crawlers on wind currents as has been noted for scale …

Protecting Citrus From Pests and Diseases

Ernie Neff Pests

The federal Plant Protection and Quarantine (PPQ) program summarized its efforts to protect the U.S. citrus industry from pests and diseases in a recent report about its fiscal year (FY) 2020 activities. PPQ is part of the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service. A summary of its citrus efforts follows. PPQ works with citrus growers to …

citrus

CUPS Pest Management Pointers

Ernie Neff CUPS, Pests

Citrus under protective screen (CUPS) systems in Florida provide trees significant protection from the Asian citrus psyllid (ACP) and the HLB it spreads. Several other pests are also significantly reduced in CUPS, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) researchers reported. For instance, citrus leafminer (CLM) populations were reduced by more than 80%. Large predators such as …

Citrus Leafminer Control: Timing Is Everything

Tacy Callies Pests, Tip of the Week

By Lukasz Stelinski The citrus leafminer (CLM) remains a major pest of citrus throughout Florida. The adults are small, white/silver colored moths about half the size of a typical mosquito (Figure 1). Adults are difficult to spot because of their small size and because they are active only in the evening (dusk) and early pre-dawn hours. CLM adults can be …

Landscape Fabric Blocks Diaprepes Larvae

Ernie Neff Pests

Fabric mulch landscape covers, typically used to block weeds in nurseries, can aid in diaprepes root weevil control, Larry Duncan reported at the recent Citrus Expo. “Some of these products, not all of them, are extremely effective at blocking the diaprepes weevil larvae from getting into the soil” after falling from a citrus tree, Duncan said. Duncan is a University …

Pest Prompts Revised Import Requirements

Ernie Neff Pests, Trade

The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) on Aug. 20 revised the entry requirements for citrus fruit from the Districts of Riverina and Sunraysia in Australia. According to APHIS, the revision is necessary because both Riverina and Sunraysia no longer meet the requirements to be considered fruit fly-free areas for Queensland fruit fly (Bactrocera tryoni). …

IPCs Help With Diaprepes and Nematodes

Ernie Neff Pests

Florida citrus growers have known for several years that individual protective covers (IPCs) do a good job of excluding HLB-spreading Asian citrus psyllids from young trees. “But those protective covers also protect from things like Diaprepes abbreviatus,” researcher Larry Duncan told the recent Citrus Expo audience. Duncan is a nematologist at the University of Florida Institute of Food and Agricultural …

Glassy-Winged Sharpshooter Making a Comeback?

Tacy Callies California Corner, Pests

The glassy-winged sharpshooter (GWSS) is a pest that made California headlines from the late 1980s until its suppression at the turn of the new century. Unfortunately, it made a fast comeback in 2020, probably due to unusually warm winter weather. A warm winter and spring caused populations in the southern San Joaquin Valley to surge. Kern County traps showed a …

Chilli Thrips a Potential Problem in CUPS

Tacy Callies All In For Citrus Podcast, CUPS, Pests

A modified way of producing citrus in Florida to protect against the Asian citrus psyllid may provide shelter for another pest — chilli thrips. Citrus under protective screen (CUPS) production systems protect against the psyllid and the huanglongbing (HLB) disease the pest transmits. However, according to University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) entomologist Lauren Diepenbrock, the …

Snail Management: What Works

Tacy Callies Pests, Tip of the Week

By Lauren Diepenbrock In the past few years, several citrus growers have been impacted by yet another non-native pest in their groves. This time it is not an insect or mite; it’s a snail. Bulimulus sporadicus is a relatively new pest to Florida, first found in Duval County in 2009. It has quickly moved throughout much of the state, causing …

Interplanting Improves Wasp Control

Ernie Neff Pests

Lucerne (also known as alfalfa) interplanting improved citrus gall wasp (CGW) control in Australia’s New South Wales (NSW). The interplanting is practiced by some citrus growers in NSW to suppress weeds, reduce soil compaction and improve soil fertility. Jianhua Mo of the NSW Department of Primary Industries addressed the matter; a summary of Mo’s comments follows. One possible explanation is …

Treating Pathogens Without Antibiotics

Ernie Neff Diseases, Pests

Federal researchers announced that they have found an innovative way to treat pathogens (harmful bacteria) and pests in citrus trees and potato and tomato plants without the use of antibiotics. The researchers are with the U.S. Department of Agriculture’s (USDA) Agricultural Research Service (ARS). The research was done in collaboration with the University of Florida and AUM LifeTech Inc. The …