Correction
April 2, 1982
In last week's column on gypsy-moth control, the headline said that Bacillus thuringiensis, or Bt for short, was a chemical control. This is not the case. Bt is a biological control.
In last week's column on gypsy-moth control, the headline said that Bacillus thuringiensis, or Bt for short, was a chemical control. This is not the case. Bt is a biological control.