IN YOUR ORCHARD
David Doll, UCCE Pomology
Farm Advisor, Merced County
Not Advised
Rowstrip
Telone-II
Broadcast
Telone II
Rowstrip
or Spot
Chloropicrin
Rowstrip C35,
Chloropicrin
No Orchard History,
Fallow Field, No
Nematodes
X
No Orchard History,
with Nematodes
X – Population
dependent
X – Population
dependent
Orchard History with
No Nematodes, Sandy
Loams or Coarser
X
Orchard History with
No Nematodes, Silt/
Clay Loams or Finer
Possible
X
Orchard History with
Nematodes
X – Population
dependent
X – Population
dependent
Orchard History with
Aggressive Pathogens
Some benefit
Some benefit
When considering to fumigate, consider the orchard history, presence of nematode species, and soil type.
purpose of fumigating. The field should be prepped and
the irrigation system installed or ready to be installed
immediately after planting. Bare root trees should be
planted as soon as possible. Potted trees have more
flexibility in planting timing.
Fumigation should be considered in areas with high
population of plant parasitic nematodes (Ring, Lesion,
or Rootknot) or a history of Prunus species (peach, plum,
almond, cherry, etc). A matrix to assist with the decision
is provided in the table. Although not a true replant
scenario, almonds following grapes often struggle
with high counts of Ring and Rootknot nematode and
fumigation with Telone-II should be considered. In other
soil types, replanting Prunus species after other Prunus
species creates not only nematode problems, but also
issues with Prunus Replant Disease. In these situations, a
nematode analysis can help determine if chloropicrin,
mixture of chloropicrin and Telone-II, or Telone-II should
be used.
The Final Thought
There seem to be many complaints regarding NOW
damage this past year. Winter sanitation is the first and
primary means of reducing NOW populations. I often hear
how expensive it is to winter sanitize, but rarely do people
consider the cost of not sanitizing: every one percent
NOW damage for a 2,500 pound per acre crop is $62
per acre in lost production, excluding the loss of processing
bonuses. Plan to remove mummies to less than two per tree
this winter in areas Merced County and north, and less than
one mummy per tree Madera County and south.
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A L M O N D F A C T S
