Biology and management of Phytomyza gymnostoma: a new invasive pest of Allium crops in the eastern US
Entomological Society of America – Eastern Branch March 19, 2018
Brian Nault1, Shelby, Fleischer3, Ethan Grundberg2, Teresa Rusinek2, Dana Roberts2 and Timothy Elkner4 1Cornell University 2Cornell Cooperative Extension 3Penn State University 4Penn State Cooperative Extension Photo: Andre Megroz Leafminer pests (Diptera: Agromyzidae) of Allium crops in U.S.
American serpentine leafminer (Liriomyza trifolii)
Vegetable leafminer (Liriomyza sativae) Leafminer pests (Diptera: Agromyzidae) of Allium crops in U.S.
American serpentine leafminer (Liriomyza trifolii)
Vegetable leafminer (Liriomyza sativae)
*Allium leafminer (Phytomyza gymnostoma)
*New invasive Allium pest in North America detected in 2015 Outline
I. Origin and distribution II. Identification and phylogeny III. Host range and damage to Allium spp. IV. Biology and phenology V. Detection and management World distribution of P. gymnostoma
CABI Crop Protection Compendium (2018) Origin – Poland (1858) 21 countries in Europe; 2 in Asia; 1 in North America North American distribution of Phytomyza gymnostoma
First detected in Lancaster County, PA (2015)
Confirmed in MD, PA, NJ and NY as of 3/14/18 Phytomyza gymnostoma (Loew)
Allium leafminer Adult
Photo: André Mégroz
Photo: B. Nault Phytomyza gymnostoma (Loew)
black body – 3.0 mm (2 to 3x larger than T. trifolli)
large yellow frons
white haltere
Yellow tips on distal end of femurs
Photo: E. Agallou and D. Collins Phytomyza gymnostoma (Loew)
Female Male
Photo: D. Roberts Photo: D. Roberts Solid black sternite Yellow “V” sternite Phytomyza gymnostoma (Loew)
Adults feed on exudates from large oviposition marks; some eggs laid
© The Author(s) 2018 Phytomyza gymnostoma (Loew)
Larva (8 mm)
Pupa 3-4 mm
Photo: S. Spichiger Photo: T. Rusinek Photo: E. Grundberg
Photo: R. Donoval Photo: R. Donoval Phylogeny of leaf- mining flies: (Diptera: Agromyzidae)
Phytomyzinae splits with Agromyzinae
Scheffer et al. (2007). Mol. Phylo. & Evol. 42(3): 756-775. Molecular phylogeny of Phytomyza *
*P. gymnostoma is the only Phytomyza spp. that utilizes Alliaceae
Winkler et al. (2009). Systematic Entomology. 34, 260–292 P. gymnostoma feeding damage detected on following Allium spp.
Common name Allium species Damage documented Wild Onion Allium canadense Yes Nodding Onion Allium cernuum Yes Onion Allium cepa Yes Scallion Allium fistulosum Yes Giant Onion Allium gygantheum Yes Field garlic Allium oleraceum - Mediterranean Onion Allium paniculatum - Leek Allium porrum Yes Garlic Allium sativum Yes Chive Allium schoenoparasum Yes Round-headed leek Allium sphaerocephalon - Ramps Allium tricoccum - Garlic chives Allium tuberosum Yes Wild garlic Allium vineale Yes
Barringer et al. 2018. J. of Integ. Pest Mang. 9(1): 8. Survey of P. gymnostoma detected in Allium crops in NY in 2017
Avg. no. Avg. no. Avg. no. % plants Farms % plants Crop marks/ larvae/ pupae/ w/ active (n) w/ marks plant plant plant mines onion 3 16 13 0 0 0.3 scallion 11 28 16 0.06 0 0.4 leek 13 20 21 1.04 1.0 4.9 chive 6 24 15 0 0 0.2 Damage by Phytomyza gymnostoma
This type of damage does not occur with other leafminers Some onion and leek fields lost Larval mining and Twisting onion leaves bacterial rot in leek
Photo: R. Donoval
Photo: T. Rusinek Damage by Phytomyza gymnostoma
Oviposition marks cause cosmetic injury to scallions and chives
Photo: E. Grundberg © The Author(s) 2018 Biology of Phytomyza gymnostoma
Adults live for up to two weeks; avg. 9 d in lab
Ovipositon marks peak 3 d after eclosion
Percentage of pupae to oviposition marks ~4%
Larvae (4 instars) feed within leaves and move toward plant base to pupate or in surrounding soil
One generation is completed in 73 days @ 20° C
Two generations per year © The Author(s) 2018 Phenology of P. gymnostoma in U.S.
Spring Generation Fall Generation
Jan. Feb. March Apr. May June July Aug. Sept. Oct. Nov. Dec.
Overwintering Summer OverwinteringOverwintering Pupae Pupae PupaePupae
AdultsAdults AdultsAdults
Eggs & larvae Eggs & larvaeEggs & larvae
Adapted from Shelby Fleischer, Penn State Periods when Allium foliage is present
Spring Generation Fall Generation
Jan. Feb. March Apr. May June July Aug. Sept. Oct. Nov. Dec.
Scallions and wild Allium spp.
leek
transplanted onion
seeded onion Periods when Allium foliage is available for ovipositing
Spring Generation Fall Generation
Jan. Feb. March Apr. May June July Aug. Sept. Oct. Nov. Dec.
Scallions and wild Allium spp.
leek
transplanted onion
seeded onion Detection of P. gymnostoma
Sticky cards are commonly used to monitor leafminer adult activity, but this has been largely ineffective for this P. gymnostoma
Photo: B. Nault Photo: B. Nault Detection of P. gymnostoma
Scout for oviposition marks on foliage Flies and marks on foliage often concentrated along field edges
Photo: B. Nault Photo: B. Nault Photo: B. Nault Photo: B. Nault Management possibilities for P. gymnostoma on Allium crops
Plant Resistance Chemical Control
Cultural Control Biological Control Management possibilities for P. gymnostoma on Allium crops
Plant Resistance Chemical Control
None known Attract & kill? Insecticides
Cultural Control Biological Control Row covers, delayed Parasitoids planting, crop rotation, trap cropping? Summary
P. gymnostoma is expanding its range and/or better documentation of its presence
Crops most vulnerable include scallions, leek and transplanted onion
Monitoring approaches reliant on visual inspection Future Research
Develop a degree-day model that can help predict emergence and longevity of populations
Identify host plant preferences
Describe infestation patterns in fields
Monitor for parasitism
Evaluate efficacy of conventional and OMRI-listed products applied via foliar and drip systems
Identify how insecticides are managing this pest Acknowledgements
Cornell University Molly Cappiello Riley Harding Souleymane Ouattara Grower Mark Rogowski S&SO Produce
Funding NYS Ag and Markets
Photo: Andre Megroz