Wednesday, April 16, 2014

Home News Fungus gnat larvae could be damaging plant roots

Fungus gnat larvae could be damaging plant roots

Poor rooting, root disease infection may be caused by fungus gnat larvae feeding

David Kuack | February 21, 2011

Fungus gnat larvae can burrow into plant roots and into stems of cuttings that are being propagated. This can result in root damage and eventually plant death, said Tom Dudek, senior Mich. St. Univ. Extension horticulture and marketing educator. He said there have also been reports that fungus gnat adults can carry fungal pathogen spores of Botrytis, Pythium, Fusarium, Phoma and Verticillium.
Monitoring of adult fungus gnats can be done with yellow sticky cards laid horizontally near the plant pot surface. Dudek said this card orientation generally collects twice as many adults as a vertically placed card on a stake.
The adults are easily identified with a 10X or 15X hand lens. Fungus gnat adults are dark-bodied, slender, long-legged, mosquito-like insects. The larvae are wormlike with a black head capsule and a white to transparent body.
Once cuttings have rooted, Dudek said allowing the growing medium to dry between waterings is the best way to reduce fungus gnat infestations. Both insecticides and biological controls are available for fungus gnat control.

Fungus gnat larvae can burrow into plant roots of cuttings being propagated, which can result in root damage and eventually plant death.
Photo by Thomas Dudek, Mich. St. Univ. Extension

Top news

Surfinia Sumo petunias

Suntory's display at Spring Trials 2014 includes the Surfinia Sumo petunias.

Alyssum 'Golden Spring'

Ball displays the Alyssum 'Golden Spring' at Spring Trials 2014.

The Supermint series

EuroAmerican's Supermint series is on display at California Spring Trials 2014.

Research could produce a new generation of high-yield plants

Research from the University of Warwick is altering the understanding of plant development, and could lead to a new generation of high-yield plants.

French Connection Nemesia Easter Bonnet

Plant Haven is displaying its Easter Bonnet at Spring Trials 2014.