Sac Valley Orchards

Jaime Ott, Orchards Advisor, UCCE Tehama, Shasta, Glenn, Butte Red Leaf Blotch (RLB) is a foliar disease of almonds, first identified in 2024 in the northern San Joaquin Valley. In 2025, it was first detected in the Sacramento Valley, and currently the disease has been reported throughout our region. In other countries where this disease occurs, it ...

Sudan Gyawaly, UC IPM Advisor, Sacramento Valley Carpophilus truncatus, commonly called the carpophilus beetle, is a tiny (~1/10 inch long) insect and a new threat to California nut crops. A key pest of almonds in Australia, this insect reportedly causes an average of 2-5% damage in Australian almonds. The beetle was first detected in multiple counties in ...

Jaime Ott, Orchard Advisor, UCCE Tehama, Shasta, Glenn, and Butte Counties This winter is likely to be very wet, and now is the best time to start preparing. Wet winter weather can bring on a host of problems for orchards, including waterlogging, Phytophthora root and crown rot, and aerial Phytophthora infections. Flooding by rivers, standing water/soil saturation, ...

Franz Niederholzer, Orchards Systems Advisor, Colusa and Sutter/Yuba Counties Sudan Gyawaly, UC IPM Advisor, Sacramento Valley The most recent Position Report released by the Almond Board of California shows a 0.55% drop in total rejects from 2025 (2.25%) to 2026 (1.70%) for the month of August in the Sacramento Valley. The August report is the first for the new ...

Ryan Hill, UCCE Weed Science and Agronomy Advisor, Tehama, Shasta, and Glenn Counties Overview: Rimsulfuron (sold as Matrix, Hinge, Grapple, Revolt, and others) can be used in tank mixes to control difficult winter-annual weeds like hairy fleabane and Italian ryegrass and even suppress summer perennial weeds like johnsongrass and yellow nutsedge when applied appropriately. Research conducted in 2025 (linked ...