fall to the ground, because they were 

 too large to pass between the grids. 

 Dr. O. A. Brown developed the col- 

 lecting device which is located below 

 the grid to capture the attracted moths. 

 After some modifications in design, 

 this mechanical type trap was manu- 

 factured without a grid and a fairly- 

 large number purchased in tobacco- 

 growing areas. It has proven to be 

 fairly successful in attracting and cap- 

 turing hornworm moths. During the 

 3-year period, 1952-54, traps of this 

 type were operated for surveys of time 

 of emergence and abundance of tobacco 

 and tomato hornworm moths at 1 3 loca- 

 tions in Florida, the Carolinas, Ten- 

 nessee, Virginia, Maryland, New Jersey, 

 and Connecticut by Federal and State 

 entomologists. These two species are 

 now reported in light-trap collections 

 included in the Economic Insect Report. 

 We are still trying to find a lamp that 

 attracts equal numbers of both sexes of 

 the Sexta species. 



The suction-type light trap for con- 

 trol purposes differs from the electric- 

 grid and mechanical types primarily in 

 the use of a fan to draw in attracted 

 insects. A few units of a large suction- 

 type trap were produced by a manufac- 

 turer about 1950 for corn borer control. 

 BL lamps were used as the attractant. 

 The trap never has been produced for 

 sale. Another suction-type trap of 

 smaller size is being manufactured. A 

 straight or circular BL lamp is used 

 as the attractant. A trap of this type 

 is available here for inspection. 



While not a specific part of my 

 topic, mention should be made of the 

 development of an inverter which pro- 

 vides electric power at 110 volts from 

 a 12-volt storage battery. One inverter 

 ■was developed in 1959 by J. P. Hol- 

 lingsworth, and was used in limited 

 numbers by the Plant Pest Control 

 Division, A.R.S., to provide energy to survey traps in areas where electric service was 

 not readily accessible. Another type developed in Wisconsin was used in that State in 

 1959. 



Figure 4„--Electric grid insect control trap equipped with two 

 15-watt BL lamps. 



