July 16, 2021
Yellow leaves in summer could indicate plant problems. Yellow leaves on specific plants such as Pin Oak and River Birch could be signs of underlying nutrient issues like iron chlorosis.
Emergence of Japanese beetle adults is underway and reports, so far, are fewer beetles than usual.
Some species of barklice, under some circumstances, shroud the tree with silk, possibly for protection and to maintain humidity. The result is a tree trunk covered with fine silk ("silken tree wrap").
Steil began the new position June 14, following the retirement of horticulture specialist Richard Jauron. Steil previously worked as assistant director at Reiman Gardens and taught a horticulture lab course for a decade.
Emerald ash borer has been found in Pocahontas County for the first time. This invasive insect has now been found in 81 of Iowa’s 99 counties since the first detection in 2010.
Iowa’s commercial horticulture industry contributes $48 million to the state’s economy each year and provides fresh fruits and vegetables to Iowa consumers.