New Research on HLB-Associated Fruit Drop

Ashley RobinsonFruit Drop

Tripti Vashisth revealed new research information on what causes preharvest fruit drop and possible strategies to mitigate the problem. The Florida citrus industry, stricken by HLB, has suffered a sharp increase in preharvest fruit drop, leading to a substantial reduction in citrus production. According to Vashisth, assistant professor of horticulture at the University of Florida Institute of Food and Agricultural …

New Solution for Fruit Drop?

Ashley RobinsonFruit Drop, Research

Fruit left on the ground is a waste for growers and consumers alike, and Florida’s citrus industry certainly cannot afford to leave any fruit behind. Citrus fruit drop before harvest has been particularly challenging during the 2020-21 Florida growing season. That is why Fernando Alferez, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) citrus horticulturist, is researching strategies …

Seminar to Address Fruit Drop Questions

Tacy CalliesFruit Drop

Citrus fruit drop before harvest has been a perennial problem for Florida growers but has been particularly challenging this season. Tripti Vashisth and Fernando Alferez of the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) will present their latest research on fruit drop and answer questions from growers in a Zoom seminar on Feb. 16. The seminar is …

Rogers on Fruit Drop, Meetings and More

Ernie NeffAll In For Citrus Podcast, Fruit Drop

Add Michael Rogers to the list of those seeing early-season fruit drop in Florida this fall. Rogers, director of the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center, saw the drop while visiting groves. In the December All In For Citrus podcast, he also addresses flower bud induction advisories and upcoming UF/IFAS presentations. …

Recommendations for Managing Fruit Drop

Tacy CalliesFruit Drop

This fall, many Florida citrus growers are experiencing heavy fruit drop, some even up to 50 percent. Tripti Vashisth, assistant professor of horticulture at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center, recently spoke on this topic. She discussed fruit drop during the first presentation of the new UF/IFAS OJ Break meeting …

Fruit Drop Weighs Heavily on Florida Growers

Ernie NeffFruit Drop

Numerous Florida citrus growers are experiencing heavy fruit drop this fall. “For some growers, it’s the worst fruit drop they have experienced; 50 percent-plus,” says grower Lee Jones with Cross Covered Caretaking. Grower Jim Snively, with Southern Gardens Citrus, said he is hearing talk of around 30 to 50 percent-plus fruit drop. “I’m hearing pick-outs that are 20 percent to …

Fruit Drop of Citrus in Summer Months

Tacy CalliesProduction, Research

By Tripti Vashisth, Megan Dewdney and Lauren Diepenbrock This article summarizes what is known about summer fruit drop in healthy citrus trees and those with huanglongbing (HLB). Also discussed is how HLB can affect early fruit development and exacerbate fruit drop. Additionally, strategies to reduce summer fruit drop are included. Citrus flowers profusely, but less than 2 percent of the …

Reduce Fruit Drop, Increase Yield

Tacy CalliesIndustry News Release, Production, Research

University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) citrus scientists Tripti Vashisth and Fernando Alferez are trying to reduce the amount of fruit drop from Hamlin and Valencia trees prior to harvest. If fruit drops, growers can’t harvest it, and that leads to losses for farmers and less fruit at the market for consumers. Normally, about 10 to …

Valencia Oranges Hit by Heavy Fruit Drop

Ernie NeffCOVID-19, Processing, Weather

Heavy fruit drop and weather issues reportedly could lead to reduction in Florida’s Valencia orange crop. Some in the citrus industry said COVID-19 issues in processing plants have also limited the intake of Valencias from groves, but the Florida Citrus Processors Association (FCPA) says that is not likely the case. “Processors have slowed down presumably due to COVID-19 … They …

The Facts on Preharvest Fruit Drop

Tacy CalliesProduction, Research

By Tripti Vashisth, Lisa Tang and Sukhdeep Singh In citrus, huanglongbing (HLB) causes an increase in the mature fruit drop rate up to three months prior to commercial harvest. This preharvest fruit drop results in a great reduction in yield and overall grove productivity. Since the plant growth regulators that improve fruit retention on healthy trees do not have consistent …

Thermotherapy’s Effects on Fruit Drop, Yield and Quality

Tacy CalliesThermotherapy

By Megan Dewdney, Evan Johnson, Naweena Thapa and Michelle Danyluk In 2015, we started a large-scale project to determine if thermotherapy would be an effective huanglongbing (HLB) treatment for field trees. Some of the objectives were to determine effective temperature-time combinations for thermotherapy, which season gave optimal results for thermotherapy, and the effect on yield in subsequent years. TRIAL DETAILSComprehensive …

Fruit Drop and HLB

Tacy CalliesHLB Management

By Tripti Vashisth and Lisa Tang Fruit drop is a natural, physiological phenomenon that occurs in all citrus varieties. However, pre-harvest fruit drop often causes grower distress and concern as it can result in significant yield reduction as well as loss of tree resources into non-harvested fruit. THREE PERIODS OF FRUIT DROP In general, citrus trees bloom profusely in spring, …

How to Handle Glyphosate-Related Fruit Drop

Tacy Calliesweeds

By Ramdas Kanissery, Fernando Alferez and Ozgur Batuman Herbicides are one of the key inputs necessary for effective management of a wide diversity of weed infestations in citrus crop production. Most weeds in citrus could be controlled by adopting a weed management program that utilizes a combination of herbicides based on their selectivity and compatibility with the crop. This would …

HLB Management, PGRs and Fruit Drop

Tacy CalliesNews from our Sponsor

Column sponsored by the Citrus Research and Development Foundation Plant growth regulators (PGRs) are chemicals that increase or decrease plant growth, flowering and/or fruit set. PGRs include some herbicides. This article summarizes research studies on how PGRs might aid in the management of HLB. Although several successful herbicide practices were developed by University of Florida Institute of Food and Agricultural …

Outlook for Postbloom Fruit Drop

Tacy CalliesDiseases

By Megan M. Dewdney, Tripti Vashisth and Ariel Singerman In 2017, the damage from postbloom fruit drop (PFD) was lower than the previous three years. This was mainly due to the low rainfall accumulation in late winter and early spring. The long bloom with relatively few flowers at any one time made the decision of when to apply a fungicide …

Will You Be Ready for Postbloom Fruit Drop?

Tacy CalliesDiseases, PFD

By Megan M. Dewdney Again in 2016, postbloom fruit drop (PFD) caused widespread problems in Florida groves. There were multiple factors that contributed to the outbreak in 2016. The primary factor was likely the extended bloom that many saw because of a combination of tree stress caused by huanglongbing (HLB) and the very warm winter. Bloom in some groves was …

PFD

Brazilian Discusses Postbloom Fruit Drop

Ernie NeffPFD

Geraldo Silva, a scientist with Fundecitrus in Brazil, shared thoughts about postbloom fruit drop (PFD) and its control at a recent seminar in Arcadia. Silva says Brazilians assume that the PFD inoculum is present in groves at all times, because consecutive days of rain can bring on a PFD outbreak 10 years after a previous outbreak. “We can have a …

HLB

Postbloom Fruit Drop: It’s All About Timing

Ernie NeffPFD

Postbloom fruit drop (PFD) in recent years has caused many Florida citrus growers as much, or almost as much, anguish as HLB. The Citrus Research and Development Foundation (CRDF) in December approved an extension of PFD research begun in 2016. CRDF Chief Operations Officer Harold Browning discusses PFD and the research. “Progressively the last several years, PFD has increased in …

PFD control

Postbloom Fruit Drop Control: Timing Is Key

Ernie NeffCitrus Expo, Citrus Greening, PFD

Timing of fungicide sprays is the key to controlling the postbloom fruit drop (PFD) that caused many Florida citrus growers severe problems this year. That was a central message that University of Florida researcher Natalia Peres delivered at Citrus Expo this summer. In this interview, Peres discusses the keys to proper spray timing, starting with bloom. Peres says longer bloom …

dorian

Post-Hurricane: Some Fruit Drop on River; Interior Mostly OK

Ernie NeffGrapefruit, Weather

Heavy winds from Hurricane Matthew Friday caused some fruit drop in the Indian River citrus area. But the amount of drop was “not catastrophic,” said Florida Citrus Mutual spokesman Andrew Meadows. “The fact that it stayed offshore helped tremendously,” Meadows said. Some Indian River growers and packers told Mutual that in addition to fruit drop, there will likely be some …