No abstract

To minimize travel to light traps sited at a considerable distance from headquarters, the authors have developed a battery of seven light traps, to keep nightly catohes separate and in good condition for a period of up to one week.The 100-watt clear, incandescent attractant lights are switched on in succession by a programmed multiple switch based on a seven-day, clock-driven thermograph drum. Seven cams are fitted at intervals equivalent to 24 hours on the drum surface, each of arc length to keep one of the seven roller lever actuator switches closed for the night hours of orie dav per week.

'Contribution No. 331. 20nan A.H. Series A.C. remote control generating plant, or equivalent. SAmperite thermostatic delay relay No. 115 C10, 10 seconds delay normally closed, or equivalent. "icon roller lever actuator switches 70-120, or equivalent.

Light traps using incandescent lamps operated on 115-volt commercial power have been used in studies in Saskatchewan of the lepidopterous pests of rapeseed crops. However, there was a need for a light trap that could be operated in areas remote from electric power. Because of the proven usefulness of low-wattage argon lamps in pink bollworm detection investigations (Glick 1961), and their low power requirements, these lamps were used experimentally in the portable power and control system described here.