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Diplodia Tip Blight

Pine Tree Diseases

What you’ll see in Diplodia Tip Blight… is dead and dying branch tips on Pine trees. The 2 types of Pine trees in Michigan that are most susceptible are the Austrian and Scot’s Pines. The infection begins as browning needles on the end of the branch were the newest growth occurs. In advanced phases as the season progresses the infection then causes the tips to curl forming a crook.

The reason for Diplodia Tip Blight… is from a pathogen called, Diplodia sapinea, also known as Sphaeropsis with the main infection cycle beginning in May. Another disease known as Dothistroma needle blight can also infect the pines but this occurs in late summer under very rainy conditions. These pathogens are causing an increasing amount of damage in recent years due to higher rainfall totals and an older Pine population. Research has shown that older Pines and those that become weak or experience damage are far more likely to become infected with these pathogens as well as insects such as the Zimmerman Pine Moth Borer. Low hanging branches and thick layers of previously shed needles with pine cones laying on the ground increase the incidence of disease activity.

You should… help by identifying and removing dead, dying, or weak wood. Infected needles should also be removed from the ground below so as to prevent rain from splashing the spores back up into the canopy which would continue to re-infect.

We can help by… directly injecting the trunks with a systemic fungicide that will provide 2 years of control. Success has been astonishing even for Austrian Pines that were previously thought to be too late to save. One of the oldest Pines we have improved stands at over 145 years. Injections are performed in late summer ensuring the product is sent to next year’s bud ready to neutralize the fungi as it enters and the technology behind injecting versus those messy sprays now gives us the ability to provide ample supply of product into the branch buds so it will continue to sterilize for 2 full seasons without worrying about the negative effects of drifting and its exposure to those who apply the fungicide.


Related Injections

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Posted on: August 4, 2015

What you’ll see…is wilting leaves and dieback of branches, often one at a time or on one side of the tree. This can occur over a number of years, with remiss...

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