Yavapai Plant Disease Photos

Yavapai Plant Disease Photos

White foam on tree trunk

Alcohol Flux

Alcohol flux (aka slime flux, bacterial wetwood) - found on stressed mimosa and willow trees.
White froth, acidic & nearly colorless; often has pleasant fermentative odor.
 

White fuzz on green stem

Botrytis

Botrytis on tomato stem (found in hydroponic greenhouse)
Manage with fungicide labeled for tomatoes.

Stem with red specks and a few green needles

Comandra Blister Rust

Comandra blister rust on Pinus Elderica
Do not plant Elderica pine in Ponderosa areas (Prescott, Sedona).

Orange growth on tree branch

Dwarf Mistletoe

Dwarf mistletoe parasite on Pondersoa - Arceuthobium vaginatum
Affects Ponderosa pine, Pinyon pine, Douglas fir, true fir; prune infected branches or remove infected trees.

View the publication in the UA Campus Repository

2 leaf stems for comparison, one with distorted leaves

Rust

Rust: (Ravenelia versitalis) on catclaw
No management recommended.

Stem with orange growths on leaves

Cedar-apple Rust

Cedar-apple rust (Gymnosporangium) on Hawthorn
No management recommended.

Leaf with dead portion along vein

Sycamore Anthracnose

Sycamore anthracnose - Fungus
Management 
Photo: Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org

Leaves with brown spots

Bacterial Leaf Scorch on Chitalpa Tree

Bacterial leaf scorch, Xylella fastidios
https://aces.nmsu.edu/ces/plantclinic/documents/xylella-fastidiosa-facts...(link is external)
Photos: N. Goldberg NMSU-PDC

Brown, dying branches on conifer tree

Seiridium Canker

Seiridium Canker on Leyland Cypress

View the publication in the UA Campus Repository
 

Yellow strands on plant

Dodder

Dodder, Cuscuta genus
Annual seed-bearing parasitic vine, thin, thread-like, yellow or orange stems grow rapidly, wrapping around the host plant

Comparison of 2 flowers on stems, one flattened

Fasciation

Mexican hat Ratibida columnifera with fasciation, which is an abnormal fusion and flattening of plant organs, usually stems, resulting in ribbon-like, coiled and contorted tissue. Cause can be related to hormonal, genetic, bacterial, fungal, viral or environmental conditions. Remove odd growth. Photo by Mary Barnes.

Dead portion of tree trunk

Aspen Tree Heart Rot

No treatment at this advanced stage. This disease shows up in aspen as they get older.
Photo from Cindy Pitcher. Diagnosis by Bob Gessner.