March 3, 2017

Plant and Insect Diagnostic Clinic Update - March 3, 2017

The following are highlights and updates about samples and questions recently received in the Plant and Insect Diagnostic Clinic. Visit the PIDC's Facebook page to ask questions and for updates and more pictures. For more information on a particular disease or insect problem listed, follow the article cited.


Application of Preemergence Herbicides to Lawns in 2017

Crabgrass is a common weed in many lawns.  Crabgrass is an annual, warm-season grass.  Germination of crabgrass seeds usually begins about mid-April in southern Iowa, early May in northern parts of the state.  Crabgrass seeds continue to germinate over several weeks from spring into summer. 

Helping Plants Survive an Early Spring or Late Freeze

Unseasonably warm temperatures in February caused some trees, shrubs and bulbs to start growing earlier than usual.  The following Yard & Garden News Releases from Iowa State University Extension & Outreach explain the consequences of early growth and what can be done about it and are available at the Extension website. 

Dealing with Premature Flowering Spring Bulbs (2/15/17)

Emerald Ash Borer Confirmed in Jackson and Clayton Counties

Map of Iowa showing current distribution of confirmed EAB infestations

Emerald ash borer, an invasive beetle that attacks and kills ash trees, has been confirmed in Bellevue and Marquette, Iowa.  The discovery in the Jackson and Clayton Counties, respectively, brings to forty-one the number of counties within the state where EAB has been confirmed.  See the map below.