Alligatorweed Thrips for Alligatorweed Control
El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.
Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.
English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.
Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.Collapse ▲
There is a new to North Carolina management strategy for alligatorweed control. Alligatorweed (Alternanthera philoxeroides) is an invasive aquatic weed native to Brazil that arrived in the southeastern US in the early 1900s. The plant has opposite leaves, a hollow stem, and a white clover-like flower. It grows very well in our ditches, ponds, and waterways.
The plant spreads through fragmentation, with each node capable of forming a new plant. So, weed whacking ditches with alligatorweed is NOT recommended! Typical chemical control measures have included the use of glyphosate applied at regular intervals throughout the growing season.
From 2006-2015, several counties in eastern NC received Alligatorweed flea beetles (Agasicles hygrophila) in hopes that they would be a useful integrated pest management (IPM) practice. Unfortunately, NC is at the northern edge of their cold tolerance. Despite repeated attempts, strong colonies of the alligatorweed flea beetles were not attained.
In August 2018, a sample of “sick” alligatorweed from a pond in Onslow County was sent to the NC State University Plant Disease & Insect Clinic (PDIC) and the Army Corps of Engineers lab in Vicksburg, MS. Both laboratories confirmed the presence of alligatorweed thrips (Amynothrips andersoni O’Neill). The adult a. thrips is approximately 2 mm in size, and the larvae are roughly 1.5 mm.
This was the first confirmed sighting of alligatorweed thrips in NC. The a. thrips has a broader cold tolerance than the flea beetle. The a. thrips at the Onslow site easily survived the 10-day freezing spell during Winter 2018. This gives us hope that a. thrips will be a good IPM agent. The a. thrips juveniles and adults only eat alligatorweed, so there is no risk to other plants or crops.
Early damage appears as discolored and curled leaves. A high level of predation can completely defoliate a patch of alligatorweed. These are tiny, yet mighty!
Since their discovery in NC, the alligatorweed thrips have been provided to N.C. Department of Agriculture and Consumer Services, Beneficial Insect Lab. NCDA&CS is establishing a breeding population. N.C. Cooperative Extension Service has placed a. thrips at alligatorweed locations in Brunswick, New Hanover, Onslow, Craven, Hyde, and Camden counties. Steven Turner at NCDA&CS’s Beneficial Insect Lab has placed a. thrips at Apex Lake. Happy alligatorweed munching little guys!
If you see signs of thrips damage to alligatorweed, please contact me at firstname.lastname@example.org. We are trying to determine if there are other locations where these beneficial insects are active.