American Nurseryman Magazine - Horticulture Magazine and Horticulture Books - EAB visits New Jersey - June, 2014 - DEPARTMENTS

American Nurseryman Magazine - Horticulture Magazine and Horticulture Books - June, 2014

DEPARTMENTS

Plant Health: EAB visits New Jersey



Photo courtesy of Debbie Miller, USDA Forest Service; Bugwood.org

Continuing its assault on the Fraxinus of North America, emerald ash borer (Agrilus planipennis) has established itself in New Jersey, prompting yet another state to implement an action plan to stem the spread of this devastating insect. A landscaper inspecting unhealthy trees in Somerset County discovered the infestation and alerted the New Jersey Department of Agriculture, which confirmed that larvae specimens were, indeed, EAB.

Officials with New Jersey's Departments of Ag and Environmental Protection have participated in an EAB survey for the past four years, but during that study - comprising more than 300 traps around the state - no evidence had been found. It was only a matter of time, however, as counties in the bordering states of New York and Pennsylvania had confirmed the insect's presence.

The state plans to survey trees in the area immediately surrounding the initial discovery to determine the extent of the infestation; it's expected that a federal quarantine will be expanded to include New Jersey. Twenty-three states and two Canadian provinces now host emerald ash borer. The pest was first confirmed in the Detroit area in 2002 and has since destroyed tens of millions of trees.



Photo courtesy of Karen Snover-Clift, Cornell University; Bugwood.org

Update from the NAPPO

Portions of Long Island, New York, including 28 square miles in the towns of Babylon, Huntington and Oyster Bay, have been added to the USDA's Animal and Plant Health Inspection Service's (APHIS) list of regulated areas for Asian longhorned beetle (Anoplophora glabripennis). This increases the regulated area on Long Island to 51 square miles.

And there's more about EAB: APHIS has expanded the list of regulated areas for EAB to the entire state of Iowa; the beast was detected in widely separated areas of the state. Other expanded areas include the entire Commonwealth of Kentucky, as well as Boulder County and portions of Jefferson, Larimer and Weld counties in Colorado. Dane County in Wisconsin has been added; so have Jackson and Scott Counties in Tennessee; Essex County in Massachusetts, too.

APHIS is removing protected area status for EAB for the following counties in Illinois: Carroll, Henderson, Jo Daviess, Mercer, Rock Island, Stephenson, Warren and Whiteside. The agency also is removing protected area status for EAB in Crawford, Daviess, Greene, Martin and Perry counties in Indiana. These areas will remain under quarantine for EAB.

IR-4 crop safety summaries available

Four new crop safety summaries for ornamentals have been issued by IR-4, including information on Hachi-Hachi EC & SC (tolfenpyrad), Kontos (spirotetramat), Overture (pyridalyl) and SP3001 (pyrifluquinazon).

Scientists across the U.S. conducted trials to screen these four active ingredients; in general, their findings show that most crops were not adversely impacted by application of the insecticides.

More specifically, research results for the individual formulations show the following:

  • Pyridalyl, registered in 2008 for foliar applications on greenhouse ornamentals. In 46 trials conducted on 13 plant species (from 2010 to 2013) examining phytotoxicity related to the application of Overture, no injury was noted.
  • Pyrifluquinazon, registered in 2013 for foliar or drench applications on ornamentals (with a few exceptions). In 74 trials on 17 plant species examining phytotoxicity related to pyrifluquinazon application, no tested crops exhibited significant injury or growth reduction during the studies.
  • Spirotetramat, registered in 2008 for foliar or drench applications on ornamentals (with a few exceptions). From 2007 to 2013, 218 trials on 43 plant species examining phytotoxicity related to Kontos applications, results varied. Only six crops (Begonia, Coleus × hybridus, Petunia, Pelargonia, Vinca and Viola) exhibited significant injury: slight height reduction, leaf curling, bleaching of flowers or plant death at the 2X and 4X rates of drench application. One species (Verbena hybrida) showed significant flower discoloration at all rates of drench application in one trial. Foliar application may be recommended in accordance with the Kontos label.
  • Tolfenpyrad, registered in 2010 for control of aphids, leafhoppers, scales, thrips, whiteflies and early instar lepidopteran larvae on ornamentals grown in greenhouses. Ten species or genera showed minimal or no injury following foliar application of Hachi-Hachi 15EC at 21, 48 and 84 fluid ounces per gallon. Begonia, Petunia, Tagetes, Verbena, Viola and Zinna may be added to the label as crops tested for tolerance. For Tolfenpyrad SC, Alyssum, Angelonia, Antirhinnum, Begonia, Gerbera, Petunia, Tagetes, Viola and Zinnia may be listed on the label as crops tested for tolerance. Impatiens and New Guinea hybrid Impatiens should be included in the listing of crops for which treatments are not recommended.

Expansion of this label for outdoor use is planned.

Full reports can be accessed at the IR-4 website, http://www.ir4.rutgers.edu.