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 …

Mexfly Quarantine Area Removed

Ernie Neff Pests

The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (USDA/APHIS) and the Texas Department of Agriculture (TDA) removed the Mexican fruit fly (Mexfly) quarantine area in Lasara in Willacy County, Texas. The quarantine removal was effective June 9. On Nov. 5, 2020, USDA/APHIS and TDA established a Mexfly quarantine in that area and restricted interstate movement of regulated …

Mexfly Quarantine Area in Texas Reduced

Ernie Neff Pests

Federal and state agriculture agencies on June 3 released portions of the Mexican fruit fly (Mexfly) quarantine in Cameron County, Texas. The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (USDA/APHIS) and the Texas Department of Agriculture (TDA) took the action after three pest lifecycles elapsed with no additional detections in the areas released from quarantine. Releasing the …

California Reports Two Citrus Pests

Ernie Neff Pests

The Citrus Pest & Disease Prevention Program in California recently detected sweet orange scab (SOS) in new areas of the state. Additionally, an unofficial lime swallowtail butterfly (LSB) sample was identified from Los Angeles County, and several LSB sightings have been reported in Los Angeles and San Luis Obispo counties. SWEET ORANGE SCABSOS is a cosmetic fungal disease that impacts …

Research Update on Cover Crops and Nematicides

Tacy Callies Cover Crops, Pests

By Larry Duncan, Johan Desaeger and Homan Regmi Two field experiments were initiated in January 2019 to evaluate the efficacy of nematicides and cover crops for managing the sting nematode (Belonolaimus longicaudatus) in a replanted grove affected by huanglongbing (HLB). The trees were nearly two years old when perennial peanut (resistant to sting nematode) plots were established in row middles …

CLM and Canker: Dangerous Summer Duo

Ernie Neff Diseases, Pests

Chris Oswalt details the connection between citrus leafminer (CLM) and citrus canker in the May/June Central Florida citrus Extension newsletter, Citrus from the Ridge to the Valley. He also offers some management tips. “I don’t think we can overstate the effect of leafminer damage on citrus foliage and the increased development of citrus canker lesions on damaged leaves,” the multi-county …

Combating California Red Scale

Tacy Callies California Corner, Pests

California red scale (CRS) is one of the key pests for growers in the San Joaquin Valley, home to 75% of the state’s citrus production. CRS is a sap-sucking insect that attacks all parts of citrus trees. It causes dieback of branches, yield loss and downgrading of fruit. According to Sandipa Gautam, University of California assistant research entomologist at the …

Fruit Fly Pests of Florida Citrus

Ashley Robinson Pests

Exotic fruit flies are considered some of the most serious of the world’s agricultural pests due to their potential economic harm and threat to the food supply. They have a wide host range of fruit, vegetables and nuts. Most of Florida’s crops fall within the host range, including the fragile citrus industry. For this reason, it’s imperative to act quickly …

Monitoring Citrus Root Weevils

Tacy Callies Pests, Tip of the Week

By Larry Duncan Soilborne larvae that feed on citrus roots are the damaging life stage of Diaprepes abbreviatus and Pachnaeus spp. (bluegreen) root weevils. Newly developed adult weevils, which emerge throughout the warm months of the year, also occur in soil.  A peak emergence of adults occurs at some point each spring or early summer. Less frequently, a smaller emergence …

Scouting for Lebbeck Mealybugs

Tacy Callies Pests, Tip of the Week

By Lauren Diepenbrock Lebbeck mealybugs (Nipaecoccus viridis) have quickly made an impact on citrus groves in Central and South Florida since the pest was first found in 2019. While management techniques are still being studied, this article describes actions growers can take to find this pest before it becomes a problem. SOOTY MOLDLebbeck mealybugs excrete sugary honeydew, much like many …