• Irland, Lloyd C.
  Maine State Planning Office
  
• Rumpf, Thomas A
  Maine Forest Service
  

To render Bacillius Thuringiensis Berliner suitable for widespread use in spruce budworm, chortistoneura fumiferana clemens, control, it was necessary to achieve significant improvements in reliability and efficacy along with significant reductions in cost. In the Maine spruce budworm program, progress ion these areas made B thurigiensis cost-competetive with chemical insecticides by the mid 1980s.  Total cost of applying B. thuringiensis fell by two thirds from 1980 to 1985. Intensive work by manufacturers, university and federal scientists, and spray program managers facilitated by extensive region wide sharing of information contributed to the result.