Destructive Japanese Beetles will begin emerging from the ground sometime between late June and early July. The timing changes every year. With Spring off to such a late start this year, they could even emerge a bit later as most insect issues were delayed this year.
Japanese Beetles need a certain number of days of ground temperatures being maintained at a certain point before Mother Nature lets them know it’s time to emerge. They will hatch over a period of 5-8 weeks depending upon when their eggs were laid during the previous summer. The earlier a female deposited her eggs into your lawns during the summer of 2017, the earlier they will appear in 2018. Eggs laid later in the Summer will cause those particular beetles to emerge later, however most typically show up in the first 30 days once they begin emerging.
With Japanese Beetles, you can never eliminate or avoid ‘all’ of the damage they do even if you were to spray weekly. We do not advocate spraying that often as it would be too costly. Japanese Beetles emerge from the ground as full sized, ravenous eating machines. Even if someone did spray every week some damage would still occur as these insects have to do some feeding to ingest enough insecticide to kill them. We recommend 2 to 3 spray applications to ‘limit’ or ‘manage’ the lion’s share of their damage. Read more about Japanese Beetles…
This is a Linden tree 100% defoliated by Japanese Beetles. This is the type of severe damage 2-3 spray applications will avoid.
And these are the cute little critters who caused all that damage. Japanese Beetles attack a variety of trees and shrubs. Be on the lookout.
A few years ago we started receiving calls from clients who had Linden trees dripping copious amounts of sap. Along with that messy, sticky sap came hundreds of bees and wasps feeding from it. Sap was all over anything under or near these trees. Since the Linden is also the Japanese Beetle’s favorite target as well as the Summer Aphids, these trees could really be under attack and weakened by these two different insects. If you notice sap drippage along with the bees and wasps, you might want to let us know before it gets too bad. We can spray to accommodate both types of insects as they require a special mixture of two different types of products.
Remember trees don’t just decide to drip sap. If sap is dripping it is definitely caused by some type of insect. Some are easy to control and some are more difficult. Let us know if you’re having an issue!
Japanese Beetles started hatching a few weeks ago and will be around until September. They are extremely heavy in middle to South Naperville, Aurora, Batavia, Geneva and St. Charles at the moment.
They love a variety of trees and shrubs but their favorite is the Linden followed by White Birch, River Birch, Elm, Purple Plum and certain varieties of Maple and Crab. They also attack certain shrubs too numerous to list. If you see these trees displaying a ‘brownish hue’ toward the tops of the trees (as they like to feed in the sun) then you have Japanese Beetles.
You can also look for lacy leaves laying in the yard under the tree. The photo shows five beetles feeding on a Linden leaf creating that ‘lacy’ appearance.
We normally perform two spray applications to limit Japanese Beetle damage. Pictured below is a photo of a Linden tree which was taken last year in Naperville. This is the kind of total defoliation and damage Japanese Beetles are capable of if a tree is left untreated.
This kind of damage is exceptionally hard on the tree because when a tree is totally defoliated for any reason, the tree cannot absorb sunlight for energy, which affects the health of the tree.
If you find Japanese Beetles on your property, give us a call to quote a price for treatment!
Destructive Japanese Beetles are now beginning to hatch at the end of June in and around Naperville. For those of you scheduled for these treatments your first application will occur after July 4th. We don’t want to start applications too early. Remember that your susceptible trees and shrubs will still sustain some damage even with treatment. Spraying against this insect will limit their damage but will not eliminate the damage altogether as they have to do some feeding to absorb enough insecticide to kill them.
If you are not scheduled for treatment keep an eye out especially on your Linden trees as that is their favorite target. They will also attack White Birch, River Birch, Purple Plums, Elms and certain Maples and Crab Apples plus several types of bushes. And call us for an estimate for treatment!