May 3, 2023
Help Us Document the Heavy Insect Pressure in Desert Lettuce This Season
With the produce season winding down rapidly, now is a good time to reflect on pest activity and insecticide usage you experienced this season in desert lettuce. The 2023 Lettuce Crop Losses Workshop
will be held live, in-person Tuesday, May 9th
at the Yuma Agricultural Center from 11:30 until 3:00 pm (see agenda below)
. Get there early as lunch will be provided. The meeting has been approved for 2.5 CA/AZ CEUs. Participants will be asked to complete two short surveys to document pest pressure and control tactics used on lettuce this season. This workshop has been invaluable to our Vegetable IPM Team over the past 18 years because it allows us to develop accurate “real world” data on crop losses and pesticide usage which is important to the assessment of IPM programs in Arizona. It’s also valuable to PCAs, as it can translate their efforts into economic terms for their growers and confirms their value to the lettuce industry by showing the importance of key insect pests and their cost-effective management in desert lettuce production.
It's no secret, the insect activity this spring was exceptional. Lettuce aphids and green peach aphids were abundant most of the spring, and thrips numbers were down until late in the season. As I’ve reported previously, I think this may be one of the heaviest aphid years I’ve experienced in the desert in a long time. Earlier Lettuce Insect Losses surveys from theses workshops estimated that over a 18-year period, PCA made on average 1.5 sprays on lettuce for aphids (ranging from 1.0 to 2.5 sprays). For the complete report see: Insect Losses and Management on Desert Lettuce: An 18-year Summary.
Based on reports from PCAs this spring, it is likely that considerably more sprays were applied this spring for green peach aphid, and perhaps fewer for thrips. Also, a wide variety of insecticides products were reportedly used by PCA’s, some with mixed results. You can review the historical database of insecticides used for aphids and other insects here: Insecticide Usage on Desert Lettuce, 2021-2022 The bottom line
: from a historical perspective, it would be quite useful to document insect pressure and sprays applied this year compared to previous years. In addition to the reporting, Marco Pena will be presenting the latest results of his herbicide trials and areawide weed survey. Finally, I will be providing the latest efficacy trial results on aphids, thrips, worms, and whiteflies. So, we hope you can make it to the workshop and participate in this important process.
Lettuce Crops Losses Workshop
May 9, 2023 11:30-3:00 pm
Yuma Agricultural Center Conference Room
11:30-12:00 pm Lunch (It will be yummy)
12:00- 12:30 pm Impact of IPM on Lettuce Insect Losses
12:30-1:00 pm Individual Completion of LIL Questionnaires
1:00-1:30 pm Historical Results of Insect Losses /Insecticide Usage
1:30-2:00 pm Weed Management Research Update
2:00-3:00 pm Insect Management Research Update
To contact John Palumbo go to: jpalumbo@ag.Arizona.edu