Does glyphosate (Roundup and other trade names) enhance P. ramorum (sudden oak death) infection?

There is no research or other observational evidence to indicate that glyphosate application increases Phytophthora ramorum infection. In mixed-evergreen and redwood forests some land managers use glyphosate to control invasive weeds, such as French broom, poison oak, and other problematic weeds. In coastal CA, these forest types contain coast live oak, California bay laurel, tanoak, […]

I’m considering removal of bay with ramorum blight, but I have symptomatic and asymptomatic tanoak on my property. Will bay elimination protect my oaks and tanoaks?

Both bay laurels and tanoaks can spread SOD while most oaks are not infectious.  Therefore, bay removal is typically aimed at protecting oaks. In the absence of bays, you may actually be able to facilitate survival of asymptomatic tanoaks, but only if their density is low (about 20 per acre).  A possible plan of action […]

After taking down a P. ramorum-infested bay tree, can the foliage be left onsite to decompose?

Once down, spores from bay foliage will not travel nearly as far as they do in the canopy. The concern on the ground is that infested leaves, while still fresh, could have spores picked up during a wet event from soil splash onto the trunk of the tree. So, spread bay foliage in a thin […]

Can the Garbelotto lab analyze wood chips for pathogens?

The lab can, upon request, analyze wood chips at cost ($90 US dollars per sample).  Testing would confirm the presence or absence of any known dangerous pathogens.

What is the phosphite injection protocol for use against SOD?

There are currently two options for injections: Chemjet® injectors (coil activated) – volume to be injected = 20 ml; 10% of current label dose; pressure 20 PSI (pressure of injector is already set) Arborjet® injectors – volume to be injected = 40 ml; 5% of current label dose; pressure set at 35 PSI Injections should […]

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