What to know about spongy moths

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Spongy moths on tree.

MID-HUDSON- Spongy moth populations rise and fall in cycles of roughly 10 to 15 years and entomologists say that 2024 is a year of high population in the Mid-Hudson Region of the state.  Populations of spongy moths vary during the cycle, from years with few caterpillars and very minor damage to years with large numbers of caterpillars and very noticeable leaf damage and tree defoliation.

Experts says it’s a good idea to wear gloves when coming in contact with spongy moths.  They say that the hairs on the moth carry histamines that can cause a rash.  Outbreaks in spongy moths are usually ended by natural causes such as disease and predators.

Spongy moths can also impact tree health.  A healthy tree can withstand some defoliation caused by moths, but significant defoliation can kill a tree.  Experts say that trees that have been defoliated can bounce back over time.

The easiest way to remove spongy moths from trees is to do so manually, however other options are available such as affixing a foot-wide length of burlap tied to the base of a tree have proven effective as well.  This technique takes advantage of the caterpillar’s drive to crawl upwards and not turn around if they encounter the barrier of the burlap.  The accumulated caterpillars can be subsequently removed and destroyed.
In addition to the manual method, various insecticides for spongy moths are available at home and garden centers that have proven to be effective as well.



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