Hydrogen Cyanamide Injury on Lemon Orchard (Defoliation on New Growth)

from Jorge Angeles

Photo of upper half of lemon tree canopy. Middle canopy look fine with green leaves. Upper has bare stems with small to minimal leaves present.
Photo close to leamon tree canopy. large portion of background has healthy leaves still attached to tree. Foreground has some stems with leaves missing from stem. Some leane are yellow with brown lesions on part of leaf.
Photo of lemon branch. Older growth on lower of photo has leaves still present. New growth in upper photo leaves missing with only petiole attached to stems and branches.
Photo of lemon stem. Background has out of focus canopy with full leaves. Foreground in focus with stem. Leaves at nodes gone with only petiole still attached to stem..
Most of background out of focus. Foreground was stems with most of leaf missing other than petiole. A small leaf still present but small, yellow, and with heavy edge burn or lesion.
Photo of lemon branch. Older growth on lower of photo has leaves still present. New growth in upper photo leaves missing with only petiole attached to stems and branches.
Photo of upper half of lemon tree canopy. Middle canopy look fine with green leaves. Upper has bare stems with small to minimal leaves present.
Photo for mulitple lemon stems with most leaves at nodes gone with only petioles still attached to stem..
Foreground and background has stems with most leaves missing other than petiole.
Photo of lemon branch. Older growth on lower of photo has leaves still present. New growth in upper photo leaves missing with only petiole attached to stems and branches.
Photo of lemon leaves on ground around base of tree.

Blackline in walnut (End-August)

from Cameron Zuber

Base of walnut tree looking at crown. several suckers growing below graft union.
Closer photo of graft union for walnut tree. portion cut away and under is light colored wood with darker colored wood inline with graft union
Photo of walnut. Canopy has less leaf density compared to other walnuts in background. at base several suckers growing from below graft union.
Closer image of graft union on walnut tree. larger area of extrerior wood removed. cut area has lighter colored wood above and below graft union, at graft union is darker colored wood.
Base of walnut tree looking at crown. several suckers growing below graft union.
Portion of surface wood cut from walnut tree. photos shows interior with light colored wood above and below graft union . at graft union is darker colored wood.

Lab samples and cultures for Silver Leaf in Almond (End-march)

from Alejandro Hernandez Rosas

In-Field Silver Leaf in Almond (End-march)

from Cameron Zuber

(diagnostic confirmed with lab isolation and analysis)

Thompson Seedless budbreak

from Karl Lund

Lime-induced chlorosis in prune

from Cameron Zuber

Insects From the FIeld

from Idong Mokwunye

Navel orangeworm in nut

Leaffooted bug in almond

Gill’s mealybugs on pistachio

from Idong Mokwunye

Cover Crops in foothills

from Sara Rosenberg

Exciting news! We're conducting our first cover crop variety trial. Stay tuned for progress updates as we explore multipurpose cover crop uses and identify suitable varieties for the Sierra Foothills.

Facts about the many benefits cover crops can provide our soils.

Symptoms of attack by the leaffooted bug

or stink bug complex

from Idong Mokwunye

Flathead borer and damage in walnut

from Jhalendra Rijal

Foliar phylloxera galls on a rootstock sucker

from Karl Lund

Tools for checking packing tissue brown in walnuts

from Cameron Zuber

Diagnosing Almond Tree

from Cameron Zuber

 glyphosate drift in almonds