[Title: An aeroplane dusting experiment for the control of spruce bud worm carried out at Westree on June 1929]: AERIAL SHOT over forest. HAS full frame over evergreen trees in forest. CU of budworms moving on evergreen tree branch. AERIAL SHOTs over infested forest. Several shots of infested trees where defoliation is evident. CU PAN along branches showing damage caused by budworms. MS of two entomologists working in tent. CUs of mounted specimens of spruce budworms in various stages of growth. CU of illustration depicting two birds eating budworms. AERIAL SHOT over entomologists' camp. MLS of men rolling barrels of poison. MS of entomologists in camp. Sequence showing Ford Trimotor being towed to mooring, of aircraft being prepared for flight, FOLLOW MLS of Trimotor taking off. Sequence on wooden tower being built for servicing of plane. Sequence on Trimotor landing, men unloading plane into outboard, boat moving away by camera. BOATING SHOT along camp. Low level AERIAL SHOT of camp. AIR TO AIR SHOT of Royal Canadian Air Force Vickers Vedette flying boat. Low AERIAL SHOT over section of forest to be sprayed. CU of sign re arsenate of lime, poison to be srayed on trees. MS of men loading packets of poison into Trimotor. MS side view of plane, pilot getting into cockpit. Shot of plane taxiing on water, taking off in the distance. AIR TO AIR SHOTs of dusting over forest, of poison settling on trees. LS of plane landing on lake. MLS of group of men posing on top of Trimotor moored to pier at camp. [titles interspersed]