Show Wind-Vane Wind Insect Trap Aids Control ol Beet Pest PestA A new wind-vane wind insect trap devised by entomologists of the United States Department of Agriculture Is proving I useful in determining the source of leaf beet-leaf hopper ml migrations the department de do- reports Once the source of infestation Is known It may be possible ble to apply direct control measures before the insects migrate to the su Sli- gar-beet gar fields If the natural natura breeding area is small This new trap consists of a ll light ht wooden box hox housing a series of pam parallel paral leI lel upright screens connected h by a n funnel tunnel with a jar containing cyanide A weather vane attached to the box hox causes it to rotate so that it ahva always s 's faces the wind The he traps are ire mounted mount mount- ed on high pol poles s. s Insects 11 flying with the prevailing winds are caught by the screens anti and carried by air nir currents down a tube through the funnel and Into the jar of po poison son By examining the jar at regular Intervals entomologists can cnn cantell tell which winds bring the insects at what height they ar are fi flying and the extent of the flight |