As we say hello to June and good-by to May, we can certainly
look back at a month of near record temperatures – both on the minimum and
maximum sides. These yo-yo temperatures played roles in early season decisions
for growers of all crops.
First, let me put my weather hat on and review the
historical climatological data for the Fresno region from the National Weather
Service. Normally, our temperatures average in the 80s (see chart below), steadily rising as we
head toward Memorial Day.
As you can see in the temperature chart I put together, May
2012 (the top darker green line) certainly had its ups and downs, including the last week of the month. On
May 9, the thermometer officially hit 98 degrees (probably in the 100s in some
hot spots), coming close to all-time record high of 101 on that date, which was
recorded in 2001.
Then on May 25, Mother Nature caught a cold and sent temperatures
plummeting to reach a high of only 69 degrees, close to the all-time minimum high
temperature of 68 reached back in 1890. The weather slowly warmed up in the
past week, hitting a torching 104 last Friday – the first day of June.
For cotton growers, who have finished applying fertilizer to
their crop, it might be wise to put off their first irrigation of the season
until at least Tuesday. Because of crazy temperature swings, the number of heat
units hasn’t reached a high enough threshold to make it ideal to start
irrigating the cotton.
Here's an example of a pinhead square. |
On the insect front, some fields are experiencing light
damage from thrips. But I expect plants to recover from any damage, so there’s
a good chance growers won’t have to treat for this pest. On the plus side, the
thrips are feeding on the spider mite eggs, which should keep the mite
population down. I’m spotting a few more mites in some fields. I suspect that’s
due to the relatively dry winter we experienced in the Valley.
Meanwhile, the early review on the alfalfa crop is the
yields are looking good. There haven’t been any major pest threats so far.
Still I suggest growers keep monitoring for worms.
Save the Date: Remember
to put June 12 on your calendar for our Cotton Field Day. We will feature UC
IPM advisor Dr. Pete Goodell and UCCE Fresno County cotton specialist Dan Munk.
They will offer valuable tips for early season
pest and agronomic management during the 10 a.m. to noon event at the Housley
and Vandenberg Farm on Sierra Avenue in Firebaugh. Directions are available in
the events section of the Sustainable Cotton Project’s website – www.sustainablecotton.org. One and a
half hours of continuing education credits have been approved. Bring your
questions.
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