By Paul Scnhare

Saturday, August 2, 2003 


Bagworms are very active right now.  These worms will continue to feed on foliage through the latter part of August.  At that time, pupation occurs, and then adult males emerge from their bags and fly to an adult female who stays in her bag.  Mating occurs, the female lays about 750 eggs, and then she dies.  


Eggs overwinter inside the bag and hatch in early May.  At that time the young worms, make a hole in the bag, emerge and begin feeding on host plant material.  As they feed, they form a bag around themselves.  The appearance of the bag will be determined by the host plant they are feeding on.


Bagworms are fond of junipers, white pine, and arborvitae, but can be found on any foliage growing in your landscape.  They are very devastating on evergreens because once foliage is eaten on evergreen shrubs, they cannot resprout new leaves like deciduous shrubs can.


Control these pests by picking off the bags and destroying them.  If you have a large infestation, then you should spray your shrubs with diazanon, cygon, sevin, B. T., acephate, or rotenone.  The older the worms get during the latter part of the season, the harder they are to kill.