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Prior to the cold snap that occurred in the low desert last week, green peach aphid
populations were steadily colonizing untreated lettuce plots here at the Ag Center.
Very few winged forms were found, but small colonies of 5-6 nymphs could be found
on about 10% of the plants. However, temperatures in the Yuma Valley dropped below
32° F several nights during that period. Past experience has shown that aphid populations
tend to significantly slow down under these “cold” desert temperatures. That is
essentially what we observed this weekend; population growth had stalled out and
aphid numbers were the same as they were 2 weeks prior. However, past experience
has also shown us that aphid population growth begins to increase again once the
weather warms up. Our local
Remember, When in Doubt . . . . . “SCOUT”
Click picture to listen to John’s update To contact John Palumbo go to: jpalumbo@ag.arizona.edu |
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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