Pests and Diseases Viewer

Forsythia Gall



P_forsythiagall

Forsythia Gall

Usually appear in

All year


Back to Pests and Diseases


Caused By:-     The Fungus of Pomopsis Species

Description

Crown Gall(Agrobacterium tumefaciens) can cause galls on Forsythia as well as the fungus Phomopsis species.
Phomopsis species galls are light brown and irregularly shaped with a bumpy, rough texture. The galls range in size from 5mm to 30mm.
If it girdles the stem it may cause wilting or kill the branch.
After several years the gall usually die and become black. They are more easily seen in the winter when there are no leaves on the tree and are not normally near the soil, but higher up the branches.
Whilst the galls are alive the galls are producing spores to infect other forsythia and trees such as privet, hickory, maple, and oak.
Pomopsis species can also cause canker in certain trees and is believe to enter the tree by damage to the bark.
Picture by Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
See also these other Galls ACER GALL MITES, ACORN GALL MITES, AZELAE GALL, BEECH GALL MIDGE, BLACKCURRANT GALL MIDGE, BROOM GALL MIDGE, CAMELLIA GALL, CROWN GALL, EUONOMUS GALL, FELT GALL MITES, GALLS, GALL WASP, GLEDITSIA POD GALL MIDGE, HEMEROCALLIS GALL MIDGE, HAWTHORN BUTTON TOP GALL MIDGE, KNOPPER GALL OF ACORNS, LEAFY GALL, LIME NAIL GALL MITE, OAK GALL WASP, PEAR LEAF BLISTER MITE, PINAPPLE GALL ALDELGID, PLUM GALL MIDGE, ROBINS PINCUSHION, VINE ERINOSE GALL MITE, VIOLET GALL MIDGE, WILLOW BEAN GALL SAWFLY.


Control

There are no chemical controls for Phomopsis canker or gall.
Hygienic cultural practices such as increasing watering during dry periods, mulching, properly pruning, and fertilizing when necessary.
All diseased branches should be pruned during dry periods well below the gall or canker margin.
Tools used during pruning should be sterilised after use.
The diseased pruning branches should be burnt.



Back to top