Timing of defoliation, health, and type of tree influences the likelihood of recovery and survival
Now is the time to look for Japanese beetle injury to see if action is needed to protect your plants.
Scale insects are difficult to manage because their waxy or sticky covering protects them from insecticides. Learning about their life cycle can help you protect your plants.
As we move into summer it is time to be on the lookout for Japanese beetles. They are already being reported by Indiana Nursery Inspectors in Southern Indiana. Continued warm weather and precipitation should bring them out throughout the rest of the state over the next few weeks. See our bulletin Japanese Beetles in the Urban Landscape for tips on controlling them without killing pollinators.
After surveying 72 sites across Indiana and Illinois in the coldest part of our states where bagworms are found, we determined that while many bagworms were killed, enough survived to keep bagworms near the top of our landscape problem list. NOW is the time to inspect your plants for bagworms. For details on the cold snap and how to control bagworms see this article in the February issue of the Purdue Landscape Report. https://www.purduelandscapereport.org/article/824/
Boxwood leafminer damage is widespread. It’s not too late to protect boxwoods from boxwood leafminer and protect pollinators.
Spring is a good time to help you avoid pesticide spills. This article provides tips on how to clean out your pesticide storage area and safely dispose of pesticide waste.
Spring provides a great opportunity to kill insects that winter in vulnerable stages on leafless twigs, or on last year’s hardened off evergreen leaves or needles. The absence of tender leaf tissue makes it possible to use higher concentrations of oil that can kill insects without harming the plant. Dormant oil applications can have the added advantage of protecting beneficial insects and pollinators that are not active on these plants during the dormant season. What is a Dormant oil application and how does it kill insects? Oil products that can be applied in the dormant season contain between 97 to 98.8% paraffinic oil plus a surfactant. Products that are 98.8 % pure are called summer superior oils and can be applied at a 4% rate in the dormant season. Whereas those products that are 97-98% pure are called dormant oils. These are applied at a 2% rate in the dormant[Read More…]
Although winter weather came late this year, when it finally arrived at the end of December, it was fiercely cold with temperatures dipping well below 0 ˚ F. Most Indiana insects can survive these temperatures. One serious defoliator, the evergreen bagworm may have been killed by the cold weather. What are bagworms? Bagworms, Thyridopteryx ephemeraeformis (Haworth) are caterpillars that can strip the leaves from a wide variety of trees and shrubs. Evergreen shrubs, like juniper, red cedar, falsecypress, spruce, arborvitae, fir and pines can be killed when they lose more than half of their leaves to this pest. Although deciduous trees like maples, elms, birch, crabapples, willows and poplars are more likely to survive when they lose their leaves, affected trees are unsightly and repeated defoliation is likely to kill these trees. Bagworms get their name from their habit of living inside a silk bag that they cover with bits[Read More…]