Past Alerts

IA Pest Alert: Corn rootworm adult emergence has begun, so plan to assess root injury while it is fresh.

July 8, 2026

Link included: https://cornrootworm.extension.iastate.edu/basics/scouting-guidelines

Read More about IA Pest Alert: Corn rootworm adult emergence has begun, so plan to assess root injury while it is fresh.
IA Pest Alert: Soybean gall midge larvae are active in central Iowa. Learn more about scouting here.

June 17, 2026

Encyclopedia article: https://crops.extension.iastate.edu/encyclopedia/soybean-gall-midge

Read More about IA Pest Alert: Soybean gall midge larvae are active in central Iowa. Learn more about scouting here.
IA Pest Alert: A few tar spots have been observed in central Iowa. No need to spray before VT/R1. Continue to scout.

June 16, 2026

ICM Blog article: https://crops.extension.iastate.edu/post/very-low-incidence-tar-spot-central-iowa
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Pest Alert: A few tar spots have been observed in central Iowa. No need to spray before VT/R1. Continue to scout.
IA Pest Alert: Scout for cutworms, true armyworm, and bean leaf beetle as crops emerge. Read about these (and more!) in the Encyclopedia.

June 1, 2026

Link included: https://crops.extension.iastate.edu/encyclopedia?field_topic_target_id=102&field_crop_target_id=All
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Pest Alert: Scout for cutworms, true armyworm, and bean leaf beetle as crops emerge. Read about these (and more!) in the Encyclopedia.
IA Pest Alert: Scout for black cutworm as crops emerge, esp. in fields with cover crops. Preventative insecticide is NOT economical.

May 8, 2026

ICM News article: https://crops.extension.iastate.edu/cropnews/2026/05/2026-black-cutworm-cutting-predictions

Read More about IA Pest Alert: Scout for black cutworm as crops emerge, esp. in fields with cover crops. Preventative insecticide is NOT economical.
IA Pest Alert: Plan to scout for alfalfa weevil larvae. Inspect small plants or use a sweep net if enough growth has occurred.

April 1, 2026

ICM News article: https://crops.extension.iastate.edu/cropnews/2026/03/alfalfa-weevil-eggs-hatching-early-2026

Read More about IA Pest Alert: Plan to scout for alfalfa weevil larvae. Inspect small plants or use a sweep net if enough growth has occurred.
A Pest Alert: The 2025 Iowa and Regional Corn Rootworm Monitoring Network reports are now available.

January 30, 2026

Link included: https://crops.extension.iastate.edu/cropnews/2026/01/2025-corn-rootworm-monitoring-network-summary

Read More about A Pest Alert: The 2025 Iowa and Regional Corn Rootworm Monitoring Network reports are now available.
IA Event Alert: Early registration for the 36th Integrated Crop Management Conference ends TODAY! Walk-ins welcome.

December 10, 2025

Registration link: https://www.regcytes.extension.iastate.edu/icm/
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Event Alert: Early registration for the 36th Integrated Crop Management Conference ends TODAY! Walk-ins welcome.
IA Event Alert: Join us at the 36th Integrated Crop Management Conference on Dec. 10-11. See the program and register. Get the early-bird price until November 16!

November 5, 2025

Registration link: https://www.regcytes.extension.iastate.edu/icm/
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Event Alert: Join us at the 36th Integrated Crop Management Conference on Dec. 10-11. See the program and register. Get the early-bird price until November 16!
IA Pest Alert: Fall armyworm larvae are active in hayfields and small grains. Larvae may hide under residue during the day. Learn more about scouting and management.

September 15, 2025

ICM Blog article: https://crops.extension.iastate.edu/encyclopedia/fall-armyworm

Read More about IA Pest Alert: Fall armyworm larvae are active in hayfields and small grains. Larvae may hide under residue during the day. Learn more about scouting and management.
IA Pest Alert: A new corn disease was found in central Iowa last week. Read more about Curvularia leaf spot.

August 19, 2025

Link included: https://crops.extension.iastate.edu/post/curvularia-leaf-spot-corn-found-central-iowa
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Pest Alert: A new corn disease was found in central Iowa last week. Read more about Curvularia leaf spot.
IA Pest Alert: Observations of southern rust on corn continue. Products vary in efficacy.

July 24, 2025

Included links: https://cropprotectionnetwork.org/publications/fungicide-efficacy-for-control-of-corn-diseases and https://cropprotectionnetwork.org/maps/southern-corn-rust

Read More about IA Pest Alert: Observations of southern rust on corn continue. Products vary in efficacy.
IA Pest Alert: There is a great new tool to determine risk of disease in your corn and soybean fields.

July 22, 2025

Link included: https://cropprotectionnetwork.org/crop-disease-forecasting
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Pest Alert: There is a great new tool to determine risk of disease in your corn and soybean fields.
IA Pest Alert: Bacterial leaf streak looks similar to gray leaf spot and is prevalent in some fields this year. Fungicides do NOT work against BLS. Learn how to distinguish these diseases.

July 18, 2025

ICM Blog article: https://crops.extension.iastate.edu/post/bacterial-leaf-streak-abounds-some-fields
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Pest Alert: Bacterial leaf streak looks similar to gray leaf spot and is prevalent in some fields this year. Fungicides do NOT work against BLS. Learn how to distinguish these diseases.
IA Pest Alert: Risk of gray leaf spot is high (100%) across Iowa for the next week, while risk for tar spot is 0 to 5% according to the Crop Disease Forecasting Tool.

July 15, 2025

Link included: https://cropprotectionnetwork.org/crop-disease-forecasting
This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Pest Alert: Risk of gray leaf spot is high (100%) across Iowa for the next week, while risk for tar spot is 0 to 5% according to the Crop Disease Forecasting Tool.
IA Event Alert: Register to attend the Corn Borer Field Day before July 16! $25 fee includes lunch.

July 14, 2025

This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Event Alert: Register to attend the Corn Borer Field Day before July 16! $25 fee includes lunch.
IA Pest Alert: Fall armyworms are showing up in corn fields. Plan to scout, opening whorls or ears, and looking at leaves.

July 11, 2025

ICM Blog article: https://crops.extension.iastate.edu/post/fall-armyworms-making-appearance-2024

Read More about IA Pest Alert: Fall armyworms are showing up in corn fields. Plan to scout, opening whorls or ears, and looking at leaves.
IA Pest Alert: Soybean gall midge confirmed in 2 new counties. Be on the lookout for dead and wilted plants, often mistaken for hail damage.

July 8, 2025

Encyclopedia article: https://crops.extension.iastate.edu/encyclopedia/soybean-gall-midge

Read More about IA Pest Alert: Soybean gall midge confirmed in 2 new counties. Be on the lookout for dead and wilted plants, often mistaken for hail damage.
IA Event Alert: Plan to attend the Corn Borer Field Day on July 23! Fee is $25 and includes lunch.

July 7, 2025

This alert was sent to all subscribers of the Iowa Pest Alert Network.

Read More about IA Event Alert: Plan to attend the Corn Borer Field Day on July 23! Fee is $25 and includes lunch.
IA Pest Alert: Soybean gall midge larvae are active in Iowa. Plan to scout field edges for lesions.

June 17, 2025

Encyclopedia article: https://crops.extension.iastate.edu/encyclopedia/soybean-gall-midge

Read More about IA Pest Alert: Soybean gall midge larvae are active in Iowa. Plan to scout field edges for lesions.

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