Indiana Department of Natural Resources sent this bulletin at 08/28/2017 08:02 AM EDT
Weekly Review for Aug. 28, 2017
Indiana Department of Natural Resources Division of Entomology & Plant Pathology Phone: (317) 232-4120 Our Website Inspector Territories
This informal report by the Division of Entomology and Plant Pathology is designed to update the Nursery and Greenhouse industry of insect and disease pests the Division has been encountering on a week to week basis and as a way to give a “heads up” of things to be on the lookout for.
Links can be found at the bottom of the page to manage your subscription to this list. Comments and questions about this report are welcome and can be sent to Eric Biddinger or to your respective
Inspector.
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There were quite a few interesting things to see this past week. At one nursery I found a heavy infestation of what appeared to be white peach scale on a weeping cherry. This is the first time I’ve encountered this scale and the entire trunk was caked with them. I found quite a few honeylocust trees infested with honeylocust borer. This insect is a buprestid beetle is very similar to emerald ash borer in size. Honeylocust trees will usually produce gummosis that runs down the trunk as the larvae mine the vascular tissue. I found bagworms feeding on Douglas fir and Fraser fir at one nursery. The Douglas fir also had severe frost injury from earlier this spring which made it very difficult to determine what was bagworm and what was frost injury. I also came across heavy infestations of striped pine scale in Scotch pine. The crawlers were just settling down and there was also lots of sooty mold present. Other insects I found were three banded leaf hopper on redbud; aphids on river birch; oystershell scale on red maple; smeared dagger moth caterpillar on curly and hybrid poplar; white pine weevil on white and Scotch pine, and blue and Serbian spruce; lacebug on hawthorn; two marked tree hopper on redbud; spidermites on serviceberry, oak, maple and honeylocust; fall webworm on sweetgum and a Promethea moth caterpillar on tulip tree. The diseases I found were apple scab on crabapples and apples; quince rust on hawthorn, powdery mildew on white oak, tulip tree, magnolia and plane tree; downy leaf spot on black walnut; Anthracnose on plane tree; needle cast on spruce; Swiss needle cast on Douglas fir; tar spot on Norway, red and ‘Autumn Blaze’ maple; Septoria leaf spot on ‘Ivory Halo’ and yellow twig dogwood.
I wanted to share a good photo from the Asian Longhorned Beetle (ALB) training in Ohio. ALB adults are large, ranging from 0.75-1.25 inches long, with very long black and white antennae. The body is glossy black with irregular white spots. Their preferred host is maple, but they feed on many species of trees. We ask everyone to be on the lookout for this insect, especially if you see an insect that looks like this photo around areas of maple trees and see maple limbs dying and falling out of trees. In areas where ALB is present, maple is always attacked. If at all possible please try and get a photo of the insect (or collect a specimen) and note the location where it was found and contact our division. ALB can be eradicated from a site with some time, especially when found early in the infestation process.
