-5- 



Homeowners are purchasing and using these units . This unit is designed to 

 uniformly vaporize lindane at the prescribed rate of 1 gram per 15,000 cubic 

 feet of space per day, with a tolerance of 25 percent. Certain flying insects 

 like flies (if not resistant to lindane) and mosquitoes are killed, but such 

 devices have little value against roaches, carpet beetles, and other crawling 

 insects. 



2. The other type of vaporizer is one designed to vaporize a fixed amount of 



lindane within a short period of time. This "one-shot" vaporizer can be used 

 in the home , providing certain restrictions are followed. The room to be 

 fumigated should be tightly closed; all food, persons, pets, fish, and birds 

 should be removed before and during the treatment period. The room should 

 be thoroughly aired before reoccupancy. The total dosage should be vaporized 

 in 1/2 to 4 hours and should not exceed 2 grams per 1,500 cubic feet of space. 

 The primary value of this treatment is for killing nonresistant flies, mosqui- 

 toes, and other small flying insects. They also have some value in killing 

 roaches, ants, silverfish, and spiders that are present and exposed at the 

 time of application. 



We do not recommend the use of these devices. We consider them a possible health 

 hazard and generally ineffective. There are other safer, more effective means of 

 controlling insects in homes and commercial establishments. (See University of 

 Illinois Circular 900 "Insect Control by the Homeowner.") 



CAUTION: BEFORE APPLYING INSECTICIDES, READ THE LABELS CAREFULLY AND FOLLOW ALL 

 PRECAUTIONS. THIS WILL NOT ONLY INSURE PERSONAL SAFETY, BUT WILL ALSO 

 PREVENT RESIDUE HAZARDS. 



********** 



This weekly report was prepared by H. B. Petty, Steve Moore, Roscoe Randell, and 

 Don Kuhlman, University of Illinois College of Agriculture and Illinois Natural 

 History Survey, in cooperation with USDA Agricultural Research Service, Plant 

 Pest Control Branch, from information gathered by entomologists and cooperators 

 who send in weekly reports from their own localities. 



