Recent Storms and Tree Loss

Posted by David Doll  /   December 15, 2014  /   Posted in Almond  /   No Comments

The high wind from this past weeks storm has caused damage to orchards throughout the State. Trees have been blown over, uprooted from the strong winds, which will impact crop yields and orchard stand.

Diagram of a wind-thrown tree with soil attached at the base of the tree. Image credit:

This damage usually can be categorized into two categories – trees that have blown over from a failed root system or from heart rot disease.

Failed Root Systems. Damage to almond trees from failed root systems tends to occur in younger orchards and is characterized by leaning trees within saturated soils.  Read More

Print Friendly

Time to change your sprayer nozzles?

Posted by Franz Niederholzer  /   December 05, 2014  /   Posted in Almond, Pistachio, Walnut  /   No Comments
Airblast Sprayer in Almonds

Airblast Sprayer in Almonds

When was the last time you replaced the nozzles on your sprayers – airblast and/or weed?  If you can’t remember, chances are it’s been too long.  If your nozzles are worn and allowing more flow per minute than manufacturer specs you could be wasting hundreds of dollars per orchard.  For example, if you apply $200/acre/year worth of insecticides, fungicides, and miticides through worn airblast sprayer nozzles that allow 5% more flow per minute than expected, then you are wasting $10/acre/year.  For a 100 acre orchard, that’s $1000/year in excess materials.  Replacing those worn nozzles will save you hundreds of dollars per year in that 100 acre orchard.  Yes, a new set of wear-resistant airblast sprayer nozzles isn’t cheap, but spraying through worn nozzles is more expensive. Read More

Print Friendly

Preemergence herbicide concepts for orchard crops

Posted by Brad Hanson  /   November 24, 2014  /   Posted in Orchard Floor Management, Pest Management  /   No Comments

Cross post from the UC Weed Science blog 11-24-14.

It’s that time of the year when we’re planning preemergence (aka “residual”) herbicide programs for orchard and vineyard crops in California.  Typically, these are the herbicides that are applied in the fall, winter, or early spring BEFORE weeds emerge (preemergence) and they usually affect weeds as they germinate or are just beginning to emerge from the soil. [often, people mistakenly think these herbicides kill seeds or sterilize the soil which is not actually the case].

As you’re planning the specific program for the weed problems in your orchards and vineyards (or any site, really), I thought it would be a good time to review some of the concepts of residual weed control with preemergence herbicides.  Hopefully the concepts and ideas presented in the following line drawings will help us think about what PRE herbicides can and can’t do, and how to best use them in the orchard and vineyard production system. Read More

Print Friendly

Alion label changes for California orchard/vineyard crops

Posted by Brad Hanson  /   November 21, 2014  /   Posted in Almond, Orchard Floor Management, Pest Management, Pistachio, Walnut  /   2 Comments

Cross post from the UC Weed Science blog 11-21-14

Effective this fall (2014) there will be a fairly significant change to the Alion herbicide label for California orchard and vineyard crops.  Growers and PCAs will want to be aware of this as you’re planning your dormant-season herbicide programs now that many areas of the state are getting some rain.

The use patterns for Alion (active ingredient: indaziflam) has been modified for tree nuts, grapes, stone fruit, pome fruit, and olive (citrus uses were not changed). Read More

Print Friendly