The official arrival of summer means it’s time to be looking out for crop-killing insects and diseases, according to Iowa State University Extension specialists.
Armyworms and northern corn rootworm are both showing up in Iowa fields, as is northern corn leaf blight.

Armyworms have surfaced as a problem in some no-till fields seeded with cover crops, which served as a host for the destructive insects.

“This is only an occasional pest in Iowa, but seems to be somewhat common this year,” said Mark Johnson, Iowa State University Extension field...