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Western flower thrips are now beginning to increase on produce crops throughout
the area. This is evident from sample collected here at the Yuma Ag Center and by
the increase in areawide trap catches (see
Areawide Trap Insect Network). They have slowly been increasing in the Yuma
Valley, and should likely continue to increase as the days grow longer. The recent
rainfall we had last weekend may temporarily reduce numbers, but don’t expect that
to last very long. Based on historical data, if temperatures remain moderate and
rainfall is light we can expect thrips numbers to reach high levels by the mid-March
and into April (see graph below). Another factor PCAs should be concerned with this
time of the year is thrips "bioconcentration" which occurs each year in March as
lettuce acreage declines. This could be especially important this season since the
abnormally warm temperatures appear to be pushing lettuce harvests ahead of schedule
relative to years past. Each time a lettuce field is harvested and disked, adult
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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