No. 14/August 26, 2013
Fall webworm lives as a group of caterpillars that spin a communal silk web. This silk nest typically encloses the end of the branch and associated leaves. The caterpillars remain in the webbing, feeding on these enclosed leaves. When the leaves inside the web are eaten, the silk webbing is expanded to include more leaves.
Turf Insecticides and Pollinators
Insecticides, particularly neonicotinoids, have been receiving some heavy hits recently about effects on honey bees and other pollinating insects. Other pollinating insects include bumblebees, sweat bees, ground bees, flower flies, bee flies, butterflies, moths, and various beetles. Last week, I attended the National Turfgrass Entomology Workshop held in South Kingston, Rhode Island where this topic came up.
Turf rust outbreaks are commonly seen in late summer to early fall as moderate temperatures and long evening dew periods occur. Rust diseases are most severe on slow growing turf stressed by drought, summer heat, low-fertility, shade or compaction. From a distance, severely infected turf appears thin and tinted yellow, red, or brown. Closer inspection will reveal individual blades with numerous yellow orange pustules.
New Plant Diagnostic Sample Submission App
The Plant Diagnostic Sample Submission App is a joint effort to provide a way to easily submit digital images of plant problems or pests on the go. This App is available for iOS and available for free download in the iTunes store. Farmers, homeowners, greenhouse and nursery growers, agricultural specialists and others now have a new mobile application resource to identify plants, plant diseases, insect pests and other plant problems.
Modified Growing Degree Days (Base 50°F, March 1 through August 22)
Insect development is temperature dependent. We can use degree days to help predict insect emergence and activity.
Invasive Species Roundup
Spotted wing drosophila, brown marmorated stink bug, and thousand cankers disease are discussed this week.