No. 6/May 31, 2011
Intermittent colder weather continues to slow down insect development in Illinois. As stated in an earlier issue of this newsletter, most insects do not develop at temperatures below 50 degrees F with slower development when temperatures are below the low 70's degrees F.
Periodical cicadas have emerged in those areas of the southern half of Illinois where it was expected. This is the Great Southern Brood, Marlatt's XIX, which is a thirteen year brood.
Emerald Ash Borer Control
This is an ideal time to apply systemic insecticidal controls for emerald ash borer. Movement of systemic insecticides in a tree relies on transpiration, the loss of water from the leaves primarily through the stomata, resulting in a pulling of replacement water from the soil and up the trunk, bringing systemic insecticide with it.
New Disorder of Spruce in Illinois: Sudden Needle Drop of Spruce (SNEED)
The University of Illinois Plant Clinic has received spruce samples from both central and northeastern Illinois that have been diagnosed with Sudden Needle Drop (SNEED) caused by Setomelanomma holmii. While SNEED has been found in several surrounding states, this is a first find in Illinois.
Peach Leaf Curl
Peach leaf curl seems to be prevalent this spring. Mike Roegge, Educator in Adams/Brown Unit has received several questions about this disease and I have confirmed an infection of peach leaf curl on a peach tree in Montgomery County. Reports of this disease are not surprising, as this pathogen favors cool, moist weather.
Storm Damage? Friendly Reminder about Moving Firewood
The recent storms that have swept across the state have left destruction in their wake - including downed trees and limbs. I'm sure there will be lots of activity in yards across the area in the coming days. But, are you aware of the dangers associated with invasive species and moving this debris?