Skip to main content
Menu
Get Involved
Give
Contact
Ask Extension
About
Leadership
UMD Extension Impact
Diversity, Equity, Inclusion, and Respect
Careers
Directory
Program and Organizational Development
Statewide Extension Advisory Council
Resources
Animal Agriculture
Plant Agriculture
Yard & Garden
Pests
Natural Resources
Environment & Energy
Agribusiness Management
Food & Nutrition
Health & Well-Being
4-H & Youth Education
Programs
4-H Youth Development
Family & Consumer Sciences
Agriculture & Food Systems
Environment & Natural Resources
Home & Garden Information Center
Locations
Publications
News & Events
All News
Events
Insect Pest - Flies
Home
Resources
Insect Pest - Flies
For full functionality of this site it is necessary to enable JavaScript. Here are
instructions for how to enable JavaScript in your web browser
.
Sort by:
Date
Title
Updated: October 23, 2024
Allium (Onion) Leafminer
The allium leafminer Phytomyza gymnostoma (also known as the onion leafminer) has recently been detected and confirmed from infested leeks in Lancaster County, PA. This is the first confirmed infestation in the Western Hemisphere.
Updated: October 23, 2024
Allium Leaf Miner - Again - Really
I know, I know I wrote one of these just a few weeks ago and here it is again. Why a second article about this pest? I am writing now because I was a bit amazed and alarmed by some field observations in the last 2 weeks. I was on a farm in western Howard county on April 17th in a fairly recently planted onion field with the grower (keeping a safe social distance) looking for tell-tale signs of Allium leaf miner.
Updated: October 23, 2024
Allium Leaf Miner Active Now
f you are growing fall leeks or garlic or other Allium species you need to, for the next month or so (September-first freeze) watch for the tell-tale marks left by Allium leaf miner.
Updated: October 23, 2024
Allium Leafminer Active and Spreading in Maryland
The pest of onion, leek and garlic, the Allium leafminer Phytomyza gymnostoma, is active now and is showing up in more counties in Maryland. Adults will be active in Maryland for the next 4-6 weeks. This pest was first observed in Maryland in Cecil Co. in 2017 and then in Baltimore county last year, but now the fly’s tell-tale marks (fig. 1) of small round white dots in a row have been found by Robert Trumbule an onion grower in Prince George’s county. This pest was originally found in Lancaster county Pennsylvania in December 2015. Unfortunately, it is my guess that the pest is now probably in many northern/central areas of Maryland.
Updated: October 23, 2024
Allium Leaf Miner Active Soon
If you grow leeks or onions or other Allium species, now and for the next few weeks is the time to watch for the tell-tale marks left by Allium leaf miner. Allium leaf miner Phytomyza gymnostoma tell-tale marks consist of several small round white dots (made by the female’s ovipositor) in a row that appear on the middle towards the end of leaf blades (fig. 1) of their preferred hosts of leeks, onions, garlic and other Allium species.
Updated: October 22, 2024
Pre-Harvest Disease Management and Late Season Bunch Rots
Many vineyards are approaching or already within 30 days of the anticipated harvest date for early wine grape varieties. During this window, grape berries are becoming very susceptible to a variety of late-season rots, such as ripe rot, sour rot, Botrytis bunch rot, and other “secondary-fungi” associated with bunch rots.
Updated: October 22, 2024
Natural Area Management Services Directory: Insect or Disease Management
Woodlands are under increasing pressure from both native and invasive insects or diseases. Insect or disease management providers are listed here.
First
Previous
Page
1
Current page
2