By Ramdas Kanissery, Nimal Timilsina and Ruby Tiwari Chemical weed control is an essential component of the toolbox to keep weeds in check in citrus groves. Citrus growers primarily rely on herbicide to manage weeds due to their efficacy and cost-effectiveness. Despite their benefits, herbicides may have a wide range of unintended effects on citrus. For instance, an herbicide-related injury …
Rotate Psyllid Products, Fundecitrus Urges
Brazil’s Fundecitrus has launched the Insecticide Rotation Guide for Psyllid Control. Its aim is to help producers control the insect vector of citrus greening, highlighting the importance of proper rotation of products to avoid the selection of resistant psyllids. The resistance of insects and mites to pesticides can compromise the effectiveness of products and, consequently, the control of the pest …
Surprising Change in Florida Orange Forecast
The May 12 federal crop forecast increased Florida’s expected Valencia orange crop by 10% and reduced the state’s grapefruit projection by 6%. The Valencia crop was increased by 2 million boxes, to 22 million boxes, in the forecast from the U.S. Department of Agriculture’s (USDA) National Agricultural Statistics Service. As of late April, 88% of the Valencia crop had been …
Recognizing Innovators in Food Security
UPL, a global agricultural solutions company, recently announced the Allies for Agriculture initiative. The program was created to recognize those who are advancing and transforming agriculture to ensure food security. Nominations are being accepted here, and winners will be announced on a bimonthly basis beginning in July 2022. In addition to recognizing the contributions that each winner has made, UPL …
Pests, Pathogens and IPCs
By Lauren Diepenbrock, Megan Dewdney, Fernando Alferez, Jawwad Qureshi and Ozgur Batuman Individual protective covers (IPCs) are becoming commonplace in citrus production to support the development of young trees after planting. IPCs are made of fine mesh and are intended to keep Asian citrus psyllids (ACP) off young plants. Because ACP can transmit the pathogen that causes citrus greening/huanglongbing, preventing …
CRDF Seeks Growers for Rootstock Trials
The Citrus Research and Development Foundation (CRDF) is seeking Florida citrus growers on the Ridge and in the flatwoods of Southwest Florida to potentially be grower-cooperators in large rootstock trials. The goal of the new trials is to identify plant material with the traits needed by growers to realize the highest possible pound solids per acre and increase tree viability …
Now Is the Time to Start Scouting for Rust Mites
By Xavier Martini Rust mites are recurrent pests in Florida that pose problems mostly in fresh citrus production. While severe infestations can lead to fruit drop, leaf injury and abscission, rust mites cause aesthetic damage in the form of sharkskin or bronzing on the skin of fresh fruit (Figure 1A). Fresh fruit requires clean and undamaged skin, and any abrasions …
An Alternative Approach to Citrus Greening
“Life as a citrus grower is a perilous journey,” says Chip Henry. Among the toughest perils the third-generation Florida grower has endured are the freezes of the 1980s, the threat of losing his land to highway construction, and the scourge of citrus greening. Henry’s story begins with the founding of O.E. McGuire Groves in Apopka by his maternal grandparents in …
Chile Ships First Citrus of Season to United States
The Chilean citrus season began recently with the first shipment of clementines to the United States. Chile, the largest exporter of citrus in the southern hemisphere, will also supply mandarins, navel oranges and lemons to the United States. Promotional support will run from June to October. The forecast for citrus production in Chile is 45,000 tons of clementines, 120,000 tons …
Inflation Considered in OJ Marketing
The Florida Department of Citrus (FDOC) is exploring ways to entice consumers to buy orange juice (OJ) in the face of inflation, Florida Citrus Commission Chairman Steve Johnson stated recently. He reported that the FDOC is “analyzing how inflation may impact consumers in the months ahead and exploring which marketing activities may help ensure Florida orange juice remains in carts …
Products Proven to Help With HLB
Researchers offered updates on products proven to help against the devastating citrus disease HLB in a virtual seminar on April 27. University of Florida Institute of Food and Agricultural Sciences horticulturists Tripti Vashisth and Fernando Alferez discussed the benefits of gibberellic acid (GA) and brassinosteroids, respectively. Vashisth reported that GA-treated Valencia orange trees dropped less fruit and increased fruit yields …
Brazil to Study Wildlife in Citrus Orchards
Embrapa and Fundecitrus, which are investigating carbon stocks in the Brazilian citrus belt, will also study how citrus production sites and farms can be habitats for wild fauna. Embrapa is the Brazilian Agricultural Research Corporation. “Biodiversity is an indicator of environmental quality,” says Embrapa researcher José Roberto Miranda. He will coordinate the work to identify vertebrate animals, especially birds and …
Sneak Peek: May 2022 Citrus Industry
While many citrus growers use similar strategies to cope with HLB, no two approaches are exactly the same. One grower who uses a very different method to manage citrus greening is Chip Henry. In the May cover story of Citrus Industry magazine, he tells how growing organically has helped him successfully fight the disease. Sometimes, production practices aimed at protecting …
Herbicides and Fruit Drop
Weed scientist Ramdas Kanissery’s research has not shown evidence that herbicides, including glyphosate, increase citrus fruit drop or decrease yields. But in studies using different glyphosate rates, he did find that there is a relatively strong negative correlation with the fruit detachment force and the glyphosate amount applied. “That means there may be something happening with the higher glyphosate rate” …
Cold-Hardy Citrus Is New Researcher’s Focus
Muhammad Adnan Shahid in January joined the University of Florida Institute of Food and Agricultural Sciences’ (UF/IFAS) North Florida Research and Education Center (NFREC) as assistant professor of horticulture/fruit crops specialist. His Extension goal is providing fruit producers, particularly cold-hardy citrus growers, with relevant, research-based information for improving productivity, profitability and produce quality. Shahid is interested in evaluating new early …
Integration of Nutrition and Crop Protection Products
By Davie Kadyampakeni and Evan Johnson In the era of citrus greening disease (huanglongbing, HLB), maintaining optimal nutrition and disease/pest management strategies is critical for avoiding adverse effects on tree performance. Use of the right fertilization rate, timing and placement are important for optimal citrus production. In a University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) research study, …
Let’s Talk About CUPS
By Thomas H. Spreen Citrus under protective screen (CUPS) is a relatively new technology being adopted to help spur expansion of fresh citrus production in Florida. Large screen houses (approximately 10 acres) are constructed. In the current arrangement, several screen houses are located together to facilitate caretaking and harvest. Trees are planted at high densities (more than 300 trees per …
Consequences of Skyrocketing Fertilizer Prices
By Ariel Singerman and Stephen H. Futch Chemical input prices have increased significantly over the last year. In particular, the price of fertilizer has roughly doubled during the last 12 months, as denoted by Figure 1. Figure 1. Producer Price Index of Nitrogenous Fertilizer Manufacturing Source: Federal Reserve Bank of St. Louis Supply and demand factors help explain such an …
Managing Weeds in Row Middles
By Ramdas Kanissery It is essential to maintain a patch of weeds or vegetation in the row middles to hold the soil from eroding and, at the same time, without being a source for weed invasion into the tree rows (Figure 1). Below are some quick tips for managing the vegetation in row-middle spaces between the citrus tree rows: MOW …
Texas Region Plans Citrus Revival
The area of Falfurrias, Texas, was a very prosperous citrus-growing region from 1909 until 1951, according to Romulo Montilla, who has a ranch there. “However, in 1951 there was a freezing temperature that killed close to 90% of the citrus. In 1967, the remaining citrus was eliminated with another terrible freeze.” Montilla and others recently began working to return citrus …





























