By Carl Wilson, Horticulturist, Denver Cooperative Extension
Like most borers, pitch mass borer takes advantage of already weakened trees. In
landscapes, overirrigation and overcrowding are stresses identified as factors in borer
attack. Adjusting irrigation schedules and thinning overcrowded plantings should be
considered important parts of any control efforts.
Preventive trunk sprays can reduce attacks. Registered products containing pyrethroids or cygon sprayed to coat trunks and major branches during the June to August flight period of the adult moth help prevent additional boring. Two or more treatments per season should be repeated for at least two years.
Photograph of Pinon Pitch-Mass courtesy of Judy Sedbrook.
© CSU/Denver County Extension Master Gardener 2010
888 E. Iliff Avenue, Denver, CO 80210
Date last revised: 01/05/2010