June and July new and revised #EDISpubs in the Agriculture program area include:
· Citrus: Florida Citrus Rootstock Selection Guide, 3rd Edition, 2013/2014 production costs (Indian River)
· Beekeeping: African honey bees, dissecting honey bees to diagnose tracheal mites
· Nursery & Greenhouse: micropropagation, manage mulberry weed & long-stalked phyllanthus
Black Scale Saissetia oleae (Olivier, 1791) (Insecta: Hemiptera: Coccoidea: Coccidae)
The black scale is an important pest of citrus and olive trees. Originally from South Africa, this scale is now distributed worldwide. In Florida, black scale is found on citrus, cultivated olive, avocado, and many popular landscape plants. It is likely that black scale, like many invasive pests, was imported to the United States on infested nursery plants. Based on their small size and the unique life history of scale insects, these insects are difficult to detect and control. This 4-page fact sheet was written by Morgan A. Byron, Jennifer L. Gillett-Kaufman, and Sandra A. Allan, and published by the UF Department of Entomology and Nematology, March 2015. (Photo credit: Lyle Buss, UF/IFAS)
Dagger Nematode Xiphinema spp. (Cobb, 1913) Inglis, 1983 (Nematoda: Enoplea: Dorylaimia: Dorylaimina: Xiphinematinae)
Dagger nematodes parasitize plants. They cause economic damage and death of host crops through feeding on the roots and by spreading viral mosaic and wilting diseases, but field studies have shown that some control measures targeting reduction in the population of dagger nematodes can be effective in controlling viral diseases in susceptible crops. This 7-page fact sheet was written by William K. Heve, William T. Crow, and Tesfamarian Mengistu, and published by the UF Department of Entomology and Nematology, June 2015.
Can Calcium Propionate Help Maintain Calcium Concentrations and Prevent Metritis in Dairy Cows with Dystocia?
Studies have suggested that giving dairy cows supplemental calcium may reduce the incidence of metritis. This study tested this hypothesis with cows at the UF Dairy Unit and found that calcium supplements actually did not benefit postpartum health and are not recommended as means of metritis prevention. This 3-page fact sheet was written by Klibs N. Galvao, Mauricio Benzaquen, and Carlos A. Risco, and published by the UF Department of Veterinary Medicine—Large Animal Clinical Sciences, June 2015.
Florida Citrus Rootstock Selection Guide, 3rd Edition
Information about citrus rootstocks has become an important part of understanding and managing citrus greening (Huanglongbing or HLB). This selection guide covers 20 characteristics of 45 citrus rootstocks and explains its methodology in detail. This 3-page fact sheet was written by William S. Castle, Kim D. Bowman, Jude W. Grosser, Stephen H. Futch, and James H. Graham and published by the UF Department of Horticultural Sciences, May 2015.
Summary of 2013/14 Production Costs for Indian River Fresh Market Grapefruit and Southwest Florida Juice Oranges
This 10-page report, developed through interviews with growers who managed their own citrus groves, outlines the cost of production budgets for fresh grapefruit and juice oranges grown during the 2013/14 season. The Florida citrus industry is on a steep learning curve as it collectively tries to maintain economically sustainable fruit yields from HLB-infected trees. Growers are experimenting with new materials and management strategies to reduce psyllid populations and improve a tree’s overall nutritional health. As a result, production costs have increased threefold since 2004. Between the 2012/13 and the 2013/14 seasons, production costs increased 30% and 34% for fresh grapefruit and juice oranges, respectively. Since 2004, production costs for fresh grapefruit have increased 182%, while costs to grow juice oranges have increased 211%.
Written by Fritz Roka, Ariel Singerman, and Ronald Muraro, and published by the UF Department of Food and Resource Economics, July 2015.
Doveweed (Murdannia nudiflora) Control in Warm-Season Turfgrass Species
Doveweed is an aggressive, naturalized summer annual weed that rapidly invades warm-season turfgrass species, especially in residential lawns, and few herbicides can effectively control it. Because of these challenges, a well-designed management strategy is necessary for doveweed control. This 4-page fact sheet describes identification, growth requirements, chemical control and cultural practices. Written by Ramon G. Leon and Bryan Unruh, and published by the UF Department of Agronomy, June 2015.
Black Turpentine Beetle, Dendroctonus terebrans (Olivier) (Insecta: Coleoptera: Curculionidae: Scolytinae)
Black turpentine beetles bore into the inner bark of stressed or injured pines, where they breed and feed on phloem tissue. Adults are strongly attracted to volatile pine odors and readily breed in fresh stumps. In typical forests, infestations do not exhibit the rapid and devastating expansion characteristic of the closely related southern pine beetle, but in stands where stress conditions are frequent or persistent, black turpentine beetle can become a chronic pest and cause significant mortality over an extended period of time. Historically, black turpentine beetle has been a major pest of pines wounded or treated with herbicides in naval stores production. During the 1950s, black turpentine beetle damaged 37 million board feet of timber and contributed to the financial collapse of turpentine farms. This 5-page fact sheet was written by Albert E. Mayfield, John L. Foltz and Jiri Hulcr, and published by the UF Department of Entomology and Nematology, June 2015. (Photo credit Adam Black and Jiri Hulcr, UF/IFAS)
An ambrosia beetle Xyleborus affinis Eichhoff, 1868 (Insecta: Coleoptera: Curculionidae: Scolytinae)
Xyleborus affinis is one of the most widespread and common ambrosia beetles in the world. It is also very common in Florida. Like other ambrosia beetles, it bores tunnels into the xylem of weakened, cut or injured trees and farms gardens of symbiotic fungus for food. Females lay eggs in the fungus-lined galleries and larvae feed exclusively on the fungi. Recent studies have shown that Xyleborus affinis can vector the fungus responsible for laurel wilt disease, which is lethal to numerous species of trees in the Lauraceae family. This 5-page fact sheet was written by Lanette Sobel, Andrea Lucky, and Jiri Hulcr, and published by the UF Department of Entomology and Nematology, June 2015. (Photo credit: Juri Hulcr, UF/IFAS)
Nursery & Greenhouse
Biology and Management of Long-Stalked Phyllanthus in Ornamental Crop Production
This 5-page fact sheet discusses the characteristics of long-stalked phyllanthus and explains how to control its growth in a nursery environment. Written by Theresa Chormanski, Chris Marble, and Lyn Gettys, and published by the UF Department of Environmental Horticulture, April 2015.
Biology and Management of Mulberry Weed (Fatoua villosa) in Ornamental Crop Production
This 4-page fact sheet discusses the characteristics of mulberry weed (Fatoua villosa) and explains how to control its growth in a nursery environment. Written by Chris Marble and Shawn Steed, and published by the UF Department of Environmental Horticulture, April 2015.
Commercial Production of Ornamental Tropical Foliage Plants: Micropropagation
Florida nursery operators need to understand plant propagation principles and techniques so they can grow enough plants for sale. Micropropagation is a way to culture plant tissue to rapidly propagate a large number of plants. This 4-page fact sheet presents an overview of micropropagation to help growers evaluate it as a propagation technique for their own nursery operations. Written by J. Chen and R. J. Henny, and published by the UF Department of Environmental Horticulture, May 2015. (Photo: J. Chen, UF/IFAS)
Vespiform Thrips Franklinothrips vespiformis Crawford (Insecta: Thysanoptera: Aeolothripidae)
African Honey Bee: What You Need to Know
How to Dissect Honey Bees (Apis mellifera L.) to Detect Tracheal Mites (Acarapis woodi Rennie)
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