Controlling Shore Flies With Nematodes

Posted by Brian Sparks|July 4, 2023

Note: Information for this article comes from Griffin.

Shore flies in the greenhouse can be controlled using Steinernema carpocapsae nematodes, such as the Millenium Beneficial Nematode product from BASF. These nematodes infect and kill shore fly larvae in the media. Regular nematode drenches are an important component of controlling this pest. A drench at seeding is recommended for plants grown in hydroponic environments or container production. Follow up drenches can be performed every two to three weeks. Nematode drenches can also be applied to under bench areas, crevices, and drains. Closely following several nematode best practices can ensure growers get the most out of their nematode products and applications.

Check nematode viability. Visually identifying living nematodes is simple with appropriate magnification tools. Living nematodes retain a curly shape, resembling curly noodles or curvy letters like C’s, S’s, and J’s. Dead nematodes quickly take on a toothpick-straight appearance. Nematodes cannot be seen with the naked eye, but can be visualized under 20x or greater magnification. Powerful hand lenses or light microscopes may be used to observe nematode samples. Once mixed in solution, inspect a sample under magnification.

Make sure you receive and store nematode products properly. Nematodes should be stored at 35°F to 41°F in unopened containers in a refrigerator, away from contact with side walls. When properly stored, nematodes can remain healthy and viable in this environment for up to five weeks.

Do not mix nematodes with oxidizers or sanitizers. Nematodes are delicate creatures and can be immediately impacted by contact with sanitizers or oxidizers. Do not mix nematodes in stock tanks with these types of products and avoid drenching these types of products immediately after nematode applications.