With fall around the corner, almond
growers are on the home stretch of this year’s harvest.
Shakers are making their rounds and
shaking the last of the nuts off the trees in the San Joaquin Valley.
Entomologist Walt Bentley |
Retired entomologist and University of
California Integrated Pest Management specialist Walt Bentley sent us a note
last week reminding us to tell growers that this is the time to collect nut samples
off the ground. Here’s his advice:
“Take 200 to 500 nuts from each orchard
to examine them for damage. They can be stored in a freezer until time permits
for examining them. Farmers need to crack these out themselves. This will give
valuable information for next year’s approach to pest management. I found that
the crackouts really identify the damage incurred and keeps a farmer from
making wrong assumption about pests.”
Collect samples from the ground. |
Our almond field scout Jenna Horine has
spent recent weeks collecting nut samples for growers participating in the San
Joaquin Sustainable Farming Project. Jenna has been taking nuts from areas that
have pest traps. She’ll be cracking them and recording her findings for growers
in the coming weeks. We’ll let you know the results later this fall.
Here's a close-up of San Jose scale. | - UC IPM photo |
Walt points out that growers won’t be
kicking back after the nuts are hauled away. Autumn is an ideal time to prepare
for next season. He offers a few more tips for the fall: “Look for dead or
dying branches in trees. Then examine the wood for San Jose scale. This helps in
the determination of dormant oil needs.
Dormant oil is the best approach in the winter for San Jose scale
control. It also is the least disruptive.”
Thanks for the advice Walt.
Meanwhile, cotton field
scout Carlos Silva reports growers are
getting closer to defoliation. He finds plants in many fields are in the range
of three to five nodes above cracked boll (NACB). UC IPM says growers can
schedule defoliation at:
-
Four NACB is the target for the first harvest
aid in acala
- Three NACB is the target for defoliant timing in pima
Carlos says the white
fly counts are up, but generally not at the threshold for treatment. However, a
couple growers have been plagued with white flies this season and have treated
their fields a number of times. Our
experts haven’t figured out the reason for the persistent problem. Remember
that white flies can lead to sticky cotton.
Cotton defoliation is around the corner in the Valley. |
In alfalfa, spotted
alfalfa and pea aphids are showing up in greater numbers. Carlos says the
numbers are still below the treatment threshold and suggests growers continue
to monitoring their fields as they prepare for the last cutting for the season.
Some alfalfa growers are hoping to get an additional cutting – if the weather
cooperates. Forecasters predict cooler weather ahead by the end of the week
with temperatures dropping into the 80s. Historically, the early fall brings
welcome relief from the scorching summer heat.
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