Even by San Joaquin Valley standards, the weather has been rather
hot for this time of year with our local temperatures surging to near-record
highs. With Mother’s Day weekend seeing the mercury approaching triple digits
again, this springtime hot spell means ideal weather conditions for young
cotton plants.
Leaving strips of uncut alfalfa is a good IPM practice. |
It also is helping the alfalfa crop. Some growers are
cutting alfalfa in their fields for the second time this season. The rest should
be harvesting soon. In my sweep nets, I am finding an increase of aphids and
lygus. It could be an early season for aphids in the cotton fields around the
Valley.
Now is the time for alfalfa growers to start making plans
for managing these pests and keep them from migrating to nearby cotton fields
during the summer. Aphids are troublesome when the cotton bolls start opening.
Here are young cotton plants at the true leaf stage. |
A key Integrated Pest Management strategy involves keeping
threatening pests such as lygus and aphids from migrating from alfalfa during
cutting to nearby cotton fields. One of the best management practices is
leaving strips of uncut alfalfa as habitat to attract natural predators such as
green lacewings and parasitic bugs. In mid- to late June, growers should start
leaving one 8 to 12-foot wide strip during the third cutting. So far this
season, beneficial insects are keeping the aphid populations in check.
Cotton plants per acre are on target. |
Throughout the Valley, all the cotton has come out of the
ground. The plant population is good. I’m counting 46,000 to 56,000 plants per
acre. Generally, the optimal per-acre count is in the 30,000 to 60,000 range.
Plant development is progressing well. Many plants are coming
into the true leaf stage. It seems fields in the Dos Palos area are developing
a little faster than in the Firebaugh region. Many Dos Palos growers are seeing
their plants reach the first node stage.
Six rows of black-eyed beans along a safflower field will create a natural habitat to keep bad bugs out of cotton. |
The natural habitats we planted this season are also looking
good. We just finished planting a habitat of six rows of black-eyed beans along
a safflower field to keep lygus from going into nearby cotton later this
season.
I want to thank all the growers who worked with us to put in
the habitats. This extra effort should pay off in the long run as we strive to
reduce pesticide use, protect the environment and health of fellow community
members and improve crop yields.
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